Prior to Illustrator CS4, it was possible to control color channel values for multiple objects at once. For example, if you enter a value of 100 for Red, it would change for all objects, while Green and Blue would remain the same for each object. As of CS5 2010, this feature has disappeared: by entering a value in one of the fields in the Color panel, we get a new identical color on all objects, based on the last active color.
The script returns channel-by-channel color control of fills and strokes to Illustrator:
Enter the exact numerical values of the RGB or CMYK color channels;
Apply the mathematical operations of addition (+), subtraction (-), multiplication (), and division (/) to edit colors. For example, 2 - multiply the current channel value by two, +10 - add ten.
Calculate channel values relative to others by name. For example, R: G/3 - assign the red channel value to the green channel value divided by three.
Alternative tools
The paid plugin Phantasm edits, like Photoshop, brightness, contrast, exposure, hue and saturation. You can't set exact values.
The free extensions Colorist, Color Tweaker can only increase or decrease RGB channel values and do not work in CMYK mode.