Image 4 Kodak's Color Separation Guide can be used for testing exposure, processing, color separation and printing. For important photographic work, we can expose the first frame with this guide, then test it for color adjustment before printing the other shots with the same lighting. For copying painting etc. with medium or large format, it would be better to have this guide putting next to the painting. It is the best way to control the output because it is difficult to judge the colors of painting during enlarging etc.
Since scanning will affect the final image of color negative, even with exceptional control, Image 5 to 7 may be affected and can not be taken as factual result. The white-gray-black patches are inserted from editing with computer to check the difference.
Taking the gray patch as comparision, correct exposure shows that the middle gray matches the eighth column from left. Image 6 with 2 stops under-exposure the middle gray matches between the sixth and seventh from left. Image 7 with 2 stops over-exposure the middle gray matches the ninth and tenth from left.
It shows that if exposure is over or under, though we may still have acceptable prints. The gradation has been changed. It will be pity if we have to blame the camera or lens instead of our metering or exposure error.
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