Introduction to the ColorChecker test card
ColorChecker test card, including six gray color blocks, plus three primary colors (red, green, blue), subtractive three primary colors (yellow, goods, green), and color and simulation of natural objects, the real color, Block, from left to right and then from top to bottom, respectively, labeled 1-24. So called 24 color card. For the camera color and white balance test, we used the ColorChecker test card in different environments using the corresponding white balance mode shooting comparison, on the one hand can observe the model of the various colors of the reduction, on the other hand you can observe them Of the white balance accuracy.
ColorChecker test card application area
Digital camera: check the camera, lens and optical system color reproduction, digital camera image color correction, contrast test target white balance, in the color reproduction system to reproduce the true color.
Video: Check the camera to reproduce the quality of static and dynamic colors, check the color reproduction of the camera and its optical system, and restore the color of the projection system.
Electronics Industry: Detects color reproduction of scanners, monitors, and monitors.
Printing industry: to detect any printing and proofing procedures, detection of film, light, filters and paper.
Use the ColorChecker test card
(1) color reproduction
The Colorchecker test card can actually restore colors in any light. The first time you want to shoot should be ColorChecker standard color card, the specific steps are as follows:
ColorChecker测试卡简介
ColorChecker测试卡，包含六级灰度色块，加色三原色(红、绿、蓝)，减 色三原色(黄、品、青)，以及肤色和模拟自然物体的真实色彩， 标板有24个纯色块，从左到右再从上到下，分别标记为1-24。所以又叫24色卡。 对于摄像头色彩与白平衡的测试， 我们采用了ColorChecker测试卡在不同的环境下使用相应的白平衡模式拍摄进行比较，一方面可以观察机型对各种色彩的还原情况， 另一方面可以观察他们的白平衡准确度。
ColorChecker测试卡应用领域
数码相机：检查相机、镜头及光学系统的色彩还原情况，数码相机的图像色彩校正，对比测试目标白平衡，在色彩还原系统中再现真实色彩。
影像视频：检查摄像机静态与动态彩色的重现质量，检查摄像机及其光学系统的色彩还原情况和放映系统的色彩还原等。
电子行业：检测扫描仪、显示器、监视器的色彩还原。
印刷行业：检测任何印刷和打样程序、检测菲林、光线、滤色片和纸张。
ColorChecker测试卡使用方法
（1）色彩还原
Colorchecker测试卡可以在任意光照下真实的还原色彩。您第一个要拍摄的应是ColorChecker标准色卡，具体步骤如下介绍：
1、把ColorChecker测试卡放在拍照现场（不需要填满取景器）
2、保证相机能拍到所有色块
3、让ColorChecker测试卡位于构图中有代表性的部分，不要处于阴影中或者曝光过度的高光位置
4、不要让别的物体反射的光线投射到色卡上
5、拍摄带有色卡的照片
6、在Photoshop中被打开时，会有一个内置的参照点
7、用取色器对黑色块取样。RGB之间的差值应该在7各单位内，约为245
8、对白色块取样。 RGB的值约为245
9、检查色偏。选择中间的灰色色块,RGB的值约为128，相互之间的差值也不应超过7
10、如果读数十分偏离，应用水平或曲线调回上述状态
11、保存设定。该设定可用于同一光照条件下的其他图形。
12、进一步的视觉色彩匹配可用其余色块进行。
注意： 应使用经过校正的显示器，并且实物ColorChecker测试卡应置于可控制照明条件的标准光源下
（2）配合PM5等专业软件可以生成数码相机自定义的ICC文件
1、在自然跟可控制光线下拍摄色卡的时候，注意调整好适当的角度，不要让让光线直接通过色卡反射到镜头当中，也不要让其他物体反射的颜色投到色卡上，这样有可能造成比较大的偏差，并且让PM5在计算icc的时候出现较大的错误；
2、尽可能采用手动精确白平衡进行白平衡的锁定，可以采用灰平衡卡、白平衡卡等等。
3、曝光要控制好，可以打开直方图观察，并调整曝光补偿，注意让白色块的色值达到210-245之间方为理想。而对于黑色块的要求，可以不必理会，因为对于宽容度比较大的机型来说，当白色块达到210-245的量度的时候，黑色块已经不太可能小于23了，反而对于宽容度较小的机子却容易做到。而这里的意义实际上是尽可能控制好曝光，让色卡中的色块达到理想的白点和黑点。
4、拍摄的时候把机内所有关于对比度及色彩的设置全部设为默认值，并且也注意不要设置锐化的选项，这样也会对拍摄出来的色卡的颜色产生影响。
5.要尽量保证色卡表面的光线均匀分布，不要出现半明半暗的情况，推荐最好使用双光源，分别从左右以45°入射照亮色卡。
1, the ColorChecker test card on the camera scene (do not need to fill the viewfinder)
2, to ensure that the camera can take all the color blocks
3, so that the ColorChecker test card is located in the composition of the representative part, not in the shadows or excessive exposure to the high light position
4, do not let other objects reflect the light projected on the color card
5, take a photo with a color card
6, in Photoshop is opened, there will be a built-in reference point
7, with the color of the black block sampling. The difference between RGB should be about 7 in 7 units
8, the white block sampling. The value of RGB is about 245
9, check the color shift. Select the middle of the gray color block, RGB value is about 128, the difference between each other should not exceed 7
10, if the reading is very deviated, the application level or curve back to the above state
11, save the settings. This setting can be used for other graphics under the same lighting conditions.
12, further visual color matching can be done with the remaining patches.
Note: The calibrated display should be used and the physical ColorChecker test card should be placed under a standard light source that can control lighting conditions
(2) with PM5 and other professional software can generate digital camera custom ICC file
1, in the natural control of light with the color card, pay attention to adjust the appropriate angle, do not let the light directly through the color card reflected to the lens, do not let other objects reflect the color cast on the color card, so There may be a relatively large deviation, and let PM5 in the calculation of icc when there is a big mistake;
2, as far as possible using manual precision white balance for white balance lock, you can use gray balance card, white balance card and so on.
3, the exposure to control, you can open the histogram observation, and adjust the exposure compensation, pay attention to the color of the white block to reach 210-245 between the ideal side. And for the black block requirements, you can not ignore, because for the relatively large tolerance models, when the white block to reach the measure of 210-245 when the black block is less likely to be less than 23, but for the tolerance Small machine is easy to do. And the meaning here is actually as much as possible to control the exposure, so that the color card in the color block to achieve the ideal white and black spots.
4, when shooting all the settings on the contrast and color settings are all set to the default value, and also do not set the sharpening option, this will also be shot out of the color card color impact.
5. To try to ensure that the color of the surface of the card evenly distributed, do not appear half-dark situation, it is recommended to use the best dual light source, respectively, from about 45 ° incident light color card.
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