Quote Originally Posted by dhroane View Post
But, Mr. Bill, I STILL do not understand why, if a print is "too cyan" in hue, you would "correct it" by adding more cyan AT ALL whether that be with the use of a cyan filter or rather with a combination of blue and green filters? With either method, it appears you are still adding proportionately more cyan than red to a print that the artist has already deemed to be "too cyan."
Think of it as a negative process the result of which, the output, will be the opposite of the input.
As in black and white, the print gets darker where the negative is lighter, the print will get more cyan where there is less of it in the negative.

So a print that is too cyan needs more cyan to become less cyan.
Just like a black and white print that is too light needs more light to become less light.

When going from positive to positive (scene to print, or slide to print), the opposite is true, and you simply need to remove what there is too much of.
So if the print is too cyan, you need to use a 'minus cyan' filter in front of the camera lens to get a correct print without having to use filters to correct for it at the printing stage.