Here are the five steps to make your picture perfect with the color balance coach disk. First, place the disk in the same angle at the same position and receiving the same light as your subject. Here the subject is the fruit plate here and the disk is receiving the same light as the plate.
Second, make an exposure of the gray patch to know if the exposure value is good. Here, I am using the lamp of a flash, but you can use quartz, you can use daylight. On the gray patch, you have to have one peek in the center of the histogram.
Number three, aim at the gray patch and do a custom white balance. Make sure that you do not do a shadow when you do a reading, so make sure you have the proper setting. And this camera, when I do a white balance it proposes me to make it—the working white balance. If your camera is not of the same type, make it the working white balance. So, I say ‘ok’, it now becomes the working white balance.
Step four. Make an image including the gray patch, the two white patches and the black patch. Display the image, display the histogram and you now can check the signature of the color balance coach disk. The signature is one peak on the left to show the black and this peak should not touch the wall of the histogram. The tall gray peak in the center, this is the gray color that is here and you have the two white peaks. That are splinted and not touching the edge of the histogram. This tells you that in the picture, you will be recording from the white to the black and the exposure is perfect in the center and you are not over exposing by not touching the outside wall of the histogram.
Step five. Remove the disk and enjoy picture taking perfect every shot. As a conclusion, let us see again the five steps.
First, position the color balance coach disk exactly at the same place as your subject is. Step two, do a reading on the gray zone to make sure that the exposure is perfect. Step three, do white balance as a custom mode and set it as the working white balance. Step four, take a picture of the whole information on the disk and make sure that is when you look at the histogram, you have the signature of the color balance coach disk. Step, enjoy picture taking perfect every shot.