TGW es profesional en diseño y solución para sistemas de gestión de estacionamiento 

The Art of Exposure Compensation | Internal Mechanics of Camera Exposure.

Exposure compensation is a process by which we photographers are able to tell the camera what it should consider as the correct exposure and make adjustments accordingly. Our modern digital cameras are quite smart and they do get things right most of the time. However, there are certain problems still to be resolved.

The Art of Exposure Compensation | Internal Mechanics of Camera Exposure. 1

One of the most important problems is that our cameras cannot perceive what it is looking at. Yes, there are face- and eye-detection technologies available but their applicatios are very limited. Cameras generally tends to follow PRE-programmed algorithms for certain scenarios which can be problematic sometimes.

We will discuss the problem of exposure in this article. It is very important that you have a good understanding of light metering modes and its uses before you read this. All you need to know is right here:Basic Understanding Of Light & Need For Light Metering.

Light Metering Modes | When To Use What & Why?Give them a quick read, they will help you a lot in understanding what we are about to discuss.Lets begin then:The basic problem with our cameras is that it cannot differentiate between different subjects it views and tries to attain the same exposure for EVERYTHING.

The camera just looks at the frame and depending on the intensities of the subjects, determines an exposure setting so that the ENTIRE FRAME is exposed for 18% grey. Think of 18% grey this way; if white is considered 100% light and black is considered 0% light, 18% grey is somewhat in the middle. This is what the camera ALWAYS aims for correct exposure.

The Art of Exposure Compensation | Internal Mechanics of Camera Exposure. 2

I believe you would agree that absolute white snow and a dark black bear are not to be exposed the same way. The snow is supposed to look bright and white, while the black bear should look dark. Our cameras, however, do not understand this and hence the exposure problem.

When does this problem occur?You may now wonder if the 18% grey formula is so outdated and archaic, why do camera manufacturers still use it? The reason is quite simple actually.

The 18% grey rule DOES work most of the time. If you are a photographer who shoots average day-to-day life and not too much studio work, the rule does a wonderful job at exposing most of the pictures quite nicely.The real problem however comes up while shooting extremely dark or extremely bright objects.

For example, a snow-covered landscape or a black cat on a dark night. The basic problem that arises is the camera still tries to expose for the same 18% grey (no matter what it is shooting) and rounds up either underexposing the snow scene or overexposing the black cat.Let me explain why.

As I discussed earlier, the camera cannot perceive what it is looking at. All it can see are various colors and their intensities. So when shooting the snow-covered landscape, the camera looks at the scene and finds it too bright, it tries to bring DOWN the brightness (since it is trying to expose EVERYTHING in the scene for 18% grey) by underexposing the image.

Now the snow wouldnt look white but a little grey. It is the same deal with the cat. In the cat image, the exact opposite happens and the camera finds the black cat too dark and tries to bring it up to a grey undertone thereby OVEREXPOSING it.

The cat too in this case would look a bit grey and not black as it should.AdvertisementHere is the solution:Luckily for us, there is something that we can do. We can not only communicate to the camera that the desirable exposure is not what the camera is selecting for a particular scene, but also choose our own in the process.

This method is called exposure compensation.Now that you know exactly when these situations may occur when your camera light meter reading may be fooled and that may in-turn give you some wrong suggestions for exposure, let us jump in and learn exactly how you can fix it. Fixing the exposure:Before we learn more about the procedure to adjust exposure compensation, you must remember the following:Exposure compensation can ONLY be adjusted while using Semi-Automatic Modes, i.

e.Aperture Priority Or AVShutter Priority Or TVProgram ModeThe exposure compensation cannot be adjusted while using FULLY AUTOMATIC (God almighty, PLEASE for heavens sake get off that damn mode) or the FULLY Manual or M mode. The reason is pretty obvious.

While using the damn automatic mode you are letting the camera take all the decisions for you; so you are NOT allowed to make any changes. The opposite applies when you use the Manual mode, since now YOU are making all the decision and the camera is NOT allowed to override your settings, you have to decide how you want to adjust the exposure compensation. Changing the exposure compensation in manual mode has no effect.

How does exposure compensation work?Let me explain what happens when you adjust the exposure compensation. Suppose you are shooting the snow -covered landscape in Aperture Priority Mode and the snow just comes out UNDEREXPOSED and grey.

What you have to do now is dial down a few stops of exposure compensation (dont worry I will explain later when to dial down and when to dial up).Aperture Priority Mode lets you, as a photographer, set the aperture and in most cases the ISO. The camera in turn selects a suitable shutter speed that it thinks would expose the subject best.

Now when you decide that the snow is getting UNDEREXPOSED and dial down the exposure compensation, the built-in light meter of the camera readjusts its scale for you. If you dial down the exposure by say 2 stops; what the camera does is determine the exposure that it thinks is correct for the image and then OVEREXPOSE it by two stops. I know this sounds very confusing but trust me you will get the hang of it very soon after you use it a few times.

Read this paragraph one more time, you will need it. Try and remember the sequence.Since you are using Aperture Priority Mode here, the camera can independently set its own shutter speed.

The camera uses the shutter speed in this case to OVEREXPOSE the picture when you dial down the exposure compensation. Had you used say Shutter Priority, the camera would have then used the aperture to control and adjust the exposure. Now, if you think about it, it also makes sense why you cannot use the exposure compensation in FULLY automatic or full manual mode.

It works only when the photographer shoots in conjunction with the camera and not independently on his own. Fascinating, isnt it?The tip-off though:The images that you are trying to take may not always be a snowy landscape or a black cat, so how would you know if you need to adjust the exposure compensation on your camera?

Well heres howThe easiest and the most reliable way to check exposure and see if it is okay is to look at the histogram. NO, just looking at the LCD with your naked eyes is NOT good enough. The primary reason being that the LCD may look different in different scenarios like say under the sun, at night, if the LCD is not clean enough, variable brightness of the LCD and dont even try to ascertain exposure if you are working with many cameras at the same time by just looking at the screen.

The histogram is a MATHEMATICAL way of QUANTIFYING the data (about intensities of light) the camera just collected. In case you have not learnt anything in school, learn thismaths is hard but it is precise and accurate; so is the histogram. Just ask yourself the following questions and you will be able to figure out if you need to use exposure compensation:Are there any subjects in your frame which are quite bright or quite dark?

Take a shot and now look at the histogram. Does the histogram tend to gather up at the centerAdvertisementIf the answers to the questions above is yes, you need to adjust the exposure compensation. If you are shooting really bright or near white subjects; say a person with a fair complexion at the beach on a sunny day; the histogram should have a fair part of it accumulated at the right side of it since there is so many bright elements in the image.

If, however, the histogram seems to have all in the middle and a very little at the far right side; it means that the camera has considered the bright elements as too much light and cut down the exposure to bring all down to match 18% grey exposure settings.Rule of thumb:A good rule of thumb to remember is to look for the details. Nowadays if you are shooting RAW and are off by a stop or two you can fix it in post-production but anything more than that maybe irrecoverable.

What you should always be looking for when you are shooting are the details. Just after you take a shot, zoom in and check if the details are visible; especially if the subjects are too bright or dark. See if the weave patterns of a black cotton shirt is visible or if you could make out the feather textures of a white swan.

If however the shirt appears to be a giant black blob, double check the histogram like I asked you to; you may have an exposure compensation issue here.I did NOT discuss how to adjust your exposure compensation intentionally since it varies widely from camera to camera. In some cameras you have to change it through menus and in others, there are dedicated buttons which you can press and then use a dial to adjust it.

Please consult your camera manual for this.Lastly:Always remember there is NO such thing as CORRECT EXPOSURE. It all comes down to what YOU, the photographer wants.

You may want a high key photograph that is nearly all white or vice versa.The camera may wildly disagree with you on that but that doesnt matter. You are the decider, the decision maker.

The camera is just a tool which you use to bring your visualizations to life. So if you think that the camera is not exposing how you would like to have, tell it what to do. Because now you know how.

A little algorithm to remember easy:Bright Subject -> Camera Underexposing -> Dial DOWN exposure compensation.Dark Subject -> Camera Overexposing -> Dial UP exposure compensation. Hope you found this topic helpful.

I know it is a little hard to grasp all of it in one go. I suggest now that you have read the article; find scenarios where you may need to adjust the exposure compensation and then use it. After you use it a few times, re-read this article one more time and you will be all set.

So, go out there and shoot. now, now, now!Originally published at Seventh Light Studio RELATED QUESTION When approaching portrait photography, should one start studying natural light or studio lighting?

Theres no reason not to learn about any variety of lighting that interests you at the same time. If you feel that would be confusing, pick according to which type you find more attractive. Look for classes where you can try a variety of lighting set ups at once.

Often places that rent equipment will have studio lighting classes or trial opportunities. They will set up areas w things like: 5 light studio, single giant octagon, Try reflectors and take example shots between the quality of the light between the gold, silver, and white. You can incorporate that into set or natural light.

HOT PRODUCTS
sin datos
GET IN TOUCH WITH US
Artículos recomendados
Fundas
License Plate Recognition Parking Lot System to Create Service-oriented Parking Lot and Create Marke
License Plate Recognition Parking Lot System to Create Service-oriented Parking Lot and Create Marke
Since the development of the parking lot system, the functional changes make it used in different places. At the same time, according to the needs of users, the parking lot system manufacturer can formulate one-to-one solutions for users. After years of development, the license plate recognition parking lot system has realized the process from paper ticket management to unattended. The change of the parking lot system only provides users with the most convenient parking mode. It is understood that the large and small parking lots in many cities are being upgraded. When managing the parking lot with the traditional card picking / swiping parking lot system, we often encounter entrance and exit congestion, which brings great inconvenience to people's parking. The installation of license plate recognition parking system in the parking lot not only solves the parking problem for people, but also brings a lot of convenience to the parking lot management. In order to bring people a comfortable parking environment, the license plate recognition parking lot system realizes the automatic opening of the gate by capturing the vehicle license plate number. Such a seemingly simple license plate recognition system has brought different repercussions to the income of the parking lot. In addition to the functional changes, the appearance changes of the license plate recognition parking lot system make the parking lot more high-end. Due to the different parking lots, the license plate recognition system needs to be set differently according to the vehicles in the parking lot, such as some military regions and other special yards, The license plate recognition parking lot system can distinguish the license plate numbers of special vehicles and ordinary vehicles in the police area, so as to ensure the safety of vehicles in and out. The application of license plate recognition parking lot system in large parking lots can increase certain benefits for large parking lots. The trouble in people's life caused by the problem of difficult parking has not been well solved. Although the use of license plate recognition parking lot system can not fundamentally solve the problem of difficult parking, it can save people a lot of parking time, so, At present, most people prefer card free parking lots. The license plate recognition parking lot system creates market competitiveness for building a service-oriented parking lot.
The Parking Lot Management System Will Follow the Structured Design Line in the Future_ Taigewang Te
The Parking Lot Management System Will Follow the Structured Design Line in the Future_ Taigewang Te
With the increase of vehicles, the parking lot management system is used more and more in people's life and recognized by more and more people. With the social development, the parking lot management system also needs to keep pace with the times in terms of function and appearance. Nowadays, taigewang has spent a lot of effort to develop an intelligent parking lot system that can better meet the needs of most people in function and appearance, Make the parking lot system continue to stride into an outstanding brand. Society is developing, industry is progressing and human culture is progressing. The needs of users are ever-changing, but there is an eternal law, that is, it is expected that Taige king can provide users with more than expected goods and noble experience. Through the functional decomposition of the parking lot system, taigewang shows the appearance drawing, structure drawing and installation effect drawing of the complete parking lot system products, so as to more intuitively let users understand how our products can meet the needs of users first in every link. At the 15th China safety Expo, Taige Wanggong II parking lot system and follow II parking lot system were unveiled for the first time. Their high-end appearance design and advanced functions attracted the attention of many users. The follow II parking lot system avoided the trouble of previous license plate recognition parking lot system installation and commissioning, and directly integrated the vehicle type recognition system, flash lamp The display screens of the remaining parking spaces are concentrated on the cycle II controller, which is simple, generous and easy to operate; With high integration, small space, simple installation and wiring and convenient maintenance, it has been highly praised by many users. In the future, parking problem will become an important problem affecting people's life. Only by adopting intelligent parking system to meet people's needs as much as possible can we alleviate this situation; If the parking lot system wants to meet people's needs, both the product appearance and function must be able to meet the current growth rate of vehicles.
The Intelligent Access Gate Provides Convenient Services for the Access Management of Open Community
The Intelligent Access Gate Provides Convenient Services for the Access Management of Open Community
At present, many residential areas have anti-theft doors at the entrance and exit, access control system, intelligent channel gate system, security and other security facilities. For closed residential areas, anti-theft doors, anti-theft networks and other measures are mostly used. Intelligent channel gate system (swing gate, wing gate, three roller gate) is more suitable for open residential areas. The most widely used intelligent access gate is in the community, especially in the open community. The combination of intelligent access gate and security personnel is more reasonable and atmospheric. The intelligent access gate provides convenient services for the access management of the open community. The advantages of the intelligent channel gate are: first, the card reading part can be configured according to the demand, and the human delay or infrared induction can be reset automatically. 2、 With the functions of human card comparison and face recognition, the safety and traffic efficiency are greatly improved. 3、 With counting function, the external screen displays the flow of people, which is convenient for the owner's management. III. the gateway can work with the host network or offline. According to the parameters downloaded in advance, intelligently verify whether the pass identity is valid, authorize the pass, and record the pass information. IV. with communication interface, it can directly control the work of intelligent channel gate through software, which is convenient for centralized and unified management and control of large channel system.
Only Meeting the Parking Needs of Users Is the Long-term Plan for the Development of Parking System
Only Meeting the Parking Needs of Users Is the Long-term Plan for the Development of Parking System
At present, the parking lot system is becoming more and more competitive from product competition to brand competition to market competition. For enterprises, in the face of such fierce competition, they must master their own core technology in order to survive. Especially in this highly competitive era, only by fully meeting the needs of users can they help enterprises obtain more long-term development and improve brand clarity, Let users clearly understand the quality and brand of the gate. Brand awareness is very important for users, which can enable users to recognize products psychologically. Of course, brand awareness should have the strength of a brand and meet people's needs in terms of quality and service. Of course, for a manufacturer with a certain popularity, its product functions are more diversified, It can carry out customized development according to different needs of users. With the continuous improvement of people's living standards, parking system manufacturers need to spend more time and effort to design the appearance of products and develop some new and more advanced functions in order to meet the requirements of users. In addition, the current parking lot system is basically the same in terms of hardware equipment. For manufacturers with independent R & D ability, it is necessary to start to improve the software, which is not only conducive to the upgrading of subsequent products, but also avoid homogenization of hardware equipment with other manufacturers. Parking lot system manufacturers must win the follow-up long-term development with brand strength, further improve their product quality, provide perfect services, and attract users with their own products.
Taigewang Intelligent Creates a Cloud Parking System in the Internet Era_ Taigewang Technology
Taigewang Intelligent Creates a Cloud Parking System in the Internet Era_ Taigewang Technology
Now people's definition of the parking lot system has gradually extended from the initial entrance and exit gate rod lifting equipment to a very broad category, that is, booking parking spaces, parking, looking for cars, paying fees, including the centralized management of the parking lot. Modern parking lot system also realizes the unmanned management mode from card ticket management, Bluetooth remote recognition, license plate recognition and other technologies. People park not only to find a place to park, but also to enjoy a safe and convenient parking environment. Entering the Internet plus era, the popularity of big data, cloud services and mobile devices has further stimulated Yunan security's development and application. When security and Internet are combined, networked information transmission, comprehensive function derivation, convenient user management and optimized experience make the traditional parking lot system developed for more than 20 years break through and leap again. Cloud parking, as the name suggests, is to centrally manage the parking lot, realize cross regional resource integration, and realize a new leap in the functions of the traditional parking lot system through Internet technology. The parking cloud platform is composed of cloud management platform, parking lot equipment and terminal equipment, aiming at the application of the parking lot system Design according to the needs of platform management and people's parking requirements, so that the parking lot manager and car owners can follow the reasonable and convenient operation requirements, meet the needs of the project, and expand the customized innovation function. The use of the Internet-based parking lot system in the cloud can realize real-time query, achieve network wide interoperability, provide real-time comprehensive data for the parking lot management, and facilitate timely adjustment according to the use of parking spaces in the parking lot. Almost every parking lot is inseparable from the parking lot system. The linkage expansion function with the third-party platform plays a very important role in the construction of smart city.
Why Does the Traditional Parking Lot System Need Intelligent Transformation_ Taigewang Technology
Why Does the Traditional Parking Lot System Need Intelligent Transformation_ Taigewang Technology
With the development of society, the progress of technology and the vigorous development of Internet technology, more and more parking lots use intelligent devices to improve management efficiency through access to the Internet. The traditional parking lot system can no longer meet people's needs because of personnel cost and management efficiency. Parking lot managers have transformed and upgraded the traditional parking lot system one after another. At present, the traditional parking lot management system is prone to congestion at the entrance and exit of the parking lot during the rush hour. The traffic efficiency is very low, followed by the simple function of the system. It only plays the role of one car and one gear in the parking lot, and does not have the functions of helping car owners find parking spaces, find cars and pay fees quickly. The adopted manual charging also faces problems such as fund loopholes, card collection and change. Through LAN communication, it is necessary to install an independent database and front-end display in the parking lot during installation, and the client software is installed and run on the front-end display, which is not only large quantities and time-consuming, but also poor system scalability and maintenance. In contrast, the intelligent parking lot management system adopts the full-automatic computer management mode. From the exit of the parking lot to the road gate and then to the management center, all use the automatic control of the computer, which is very convenient for management, and the vehicles enter and leave the parking lot very quickly. In addition, it can easily realize unattended operation at the entrance and exit and automatic charging, which can greatly save the cost. Therefore, the intelligent parking lot system that can meet the needs of managers and car owners has very high potential and broad development prospects in the future. The transformation of traditional parking lot system can adopt advanced license plate recognition technology to clearly capture vehicle information and character images, so that car owners can pass in and out of the parking lot without stopping. It can also monitor the operation status of all online equipment, realize equipment fault pre discovery, self repair, real-time query of various report functions, and provide customers with a variety of pictures to query the on-site situation. It has the ability to query the charging amount in real time. The system breaks through the regional restrictions and realizes the remote management throughout the country. The car park charging system adopts automatic toll collection. It supports the popular mobile payment (Alipay, WeChat) owners who can pay app scan or login special parking APP to pay. The whole process is fast and convenient.
Only Meeting the Parking Needs of Users Is the Long-term Plan for the Development of Parking System
Only Meeting the Parking Needs of Users Is the Long-term Plan for the Development of Parking System
At present, the parking lot system is becoming more and more competitive from product competition to brand competition to market competition. For enterprises, in the face of such fierce competition, they must master their own core technology in order to survive. Especially in this highly competitive era, only by fully meeting the needs of users can they help enterprises obtain more long-term development and improve brand clarity, Let users clearly understand the quality and brand of the gate. Brand awareness is very important for users, which can enable users to recognize products psychologically. Of course, brand awareness should have the strength of a brand and meet people's needs in terms of quality and service. Of course, for a manufacturer with a certain popularity, its product functions are more diversified, It can carry out customized development according to different needs of users. With the continuous improvement of people's living standards, parking system manufacturers need to spend more time and effort to design the appearance of products and develop some new and more advanced functions in order to meet the requirements of users. In addition, the current parking lot system is basically the same in terms of hardware equipment. For manufacturers with independent R & D ability, it is necessary to start to improve the software, which is not only conducive to the upgrading of subsequent products, but also avoid homogenization of hardware equipment with other manufacturers. Parking lot system manufacturers must win the follow-up long-term development with brand strength, further improve their product quality, provide perfect services, and attract users with their own products.
The Consideration of Personal Safety Should Not Be Ignored in the Design of Access Control System_ T
The Consideration of Personal Safety Should Not Be Ignored in the Design of Access Control System_ T
The access control system mainly plays two roles: one is to control internal personnel to enter and leave the designated area within a certain time, and the other is to prevent external personnel from entering and leaving the designated area. When designing the access control system, we can't only pay attention to the security of the system and ignore the consideration of personal safety. In this regard, the practice of the United States is worthy of our reference. In China, we mainly consider whether the access control system is safe and whether there are loopholes, focusing on the security and reliability of the system. In the United States, personal safety and system safety are regarded as equally important. In the design, not only the safety of the access control system, but also the safety of personnel in the control area is considered to ensure that personnel can escape and evacuate quickly and safely in case of emergency. One of their methods is to install an escape device at the escape door, and the electric control escape device is one of the common equipment, because it takes into account the safety of the system and personal safety. Through this device, the internal personnel can retract the lock head of the electric push rod to open the door through card reading outside the door. In case of fire, they can escape as soon as possible by pushing the movable part of the escape device with their hands or body in the escape direction, so as to avoid the inability of personnel to evacuate quickly due to the failure of the electronic system. The purpose of access control system is to ensure security. Among all security, personal safety is undoubtedly the most important. The consideration of the United States in this regard is worth learning from.
Six Key Points of Intelligent Parking Lot Management System_ Taigewang Technology
Six Key Points of Intelligent Parking Lot Management System_ Taigewang Technology
Intelligent parking lot management system is an important part of intelligent transportation system. It has been put into use in foreign cities, greatly alleviating the problem of urban traffic congestion, less road occupation, improving the utilization of parking spaces, and making the parking lot achieve good social and economic benefits. At present, intelligent parking lot system has been widely used in our life. Can it solve the problem of our parking and bear the pressure brought by so many vehicles? The intelligent parking lot system is a convenient, efficient and stable intensive management means through special charging management software and large management platform, It also provides platform support for further big data analysis and the docking of CRM system and app platform. 1. Clear and simple structure: the parking lot system mainly includes ticket box, road gate and management center, which realizes the management of incoming and outgoing vehicles, with simple structure and high integration. 2. Simple management and application: due to the use of parking lot system management software, most control and management functions are realized by computer without excessive participation of managers, which reduces the work intensity of managers. 3. Powerful operation function: multiple display modes, with image capture, printing charging ticket, voice broadcast and other functions, IP intercom, etc. 4. Convenient monitoring and viewing: the intelligent parking lot system has a full video monitoring function, which can monitor the vehicle information at the entrance and exit and the parking space information in the parking lot at the same time. There are multiple monitoring on-site images for the entrance and exit information, and the authorized management personnel can view the monitoring video. 5. Extremely high safety anti smashing ability: at present, the intelligent parking lot system adopts the digital anti smashing function or pressure wave anti smashing function, which plays a protective role in the anti smashing function of the road gate. 6. Strong expandability: the main board of taigewang technology intelligent parking lot system adopts arm dual core central processor, and the docking port can be reserved for users. The system has strong expandability. The intelligent parking lot management system not only has the ability to manage the import and export of vehicles, but also provides users with functions such as parking space query, reverse car search and self-service payment, so that people can park in a real-time, efficient and convenient mode.
sin datos
Shenzhen TGW Technology Co.,Ltd es el proveedor líder de soluciones de control de acceso para el sistema de estacionamiento inteligente de vehículos, el sistema de reconocimiento de matrículas y los torniquetes de control de acceso peatonal y terminales de reconocimiento facial.
sin datos
Contáctenos

Shenzhen TigerWong Technology Co.... Ltd

Tel: 86 0755-23773884  

Correo electrónico: Info@sztigerwong.com

Añadir: Sala 601-605, Edificio 6, 1980 Parque Industrial de Ciencia y Tecnología,  Longhua Street... Longhua District... Shenzhen

           

Copyright©2021 Shenzhen TigerWong Technology Co.... Ltd   | Sitemap
chat online
Please message us and we’ll be sure to respond ASAP, what product you intrested in?