Primary Color Correction: Color Manipulation Tools - The Art and Technique of Digital Color Correction - page 155

Fig. 4.71 The actual control device for color correcting major motion pictures using printer lights. I took
this at Deluxe Labs in Hollywood while timing a trailer print.
Filters
In addition to the various tools that give you primary color correction
control, there are numerous effects plug-ins for color correction, editing,
and compositing software that allow you to place filters on your image
to make global corrections such as duotone, bleach bypass, sepia tone,
film look, and gradated filter looks (“grads”). There are really too many
of these to mention, and the filter choices are constantly expanding and
evolving, but the ability to use them creatively to affect color in your
images certainly exists and I felt I should at least mention the possibility
of its use.
Fig. 4.72 Original image.