KPT ColorTweak
This extension gives you a full-featured color “lab,” where you can alter the color attributes of your artwork. In this extension you will find controls for tweaking the brightness and contrast of your artwork, adjusting color saturation, color inversion, and grayscale properties, and for rotating colors and adjusting CMYK color tints.

Options Menu
As with all of the KPT Vector Effects extensions, the first of the four “umbrella” buttons above the Color Tweak preview window contains a pop-up Options menu.
Pressing on this symbol will give you access to the following options for the KPT Color Tweak extension, each of which is discussed in detail below.

Help, Reset, and Preferences
The Help, Reset, and Preferences commands in the KPT Color Tweak Options menu are identical to the same commands in the Options menus of all of the other extensions. For a detailed discussion of these commands, please see the Options Menu section of the User Interface discussion.

Randomize
This option tells the Color Tweak extension to randomize each control parameter, within a range that you specify, for every single object in the selected artwork. In other words, if you set the Saturation control to 25%, and your Gray Scale control to 50%, then each object in your selected artwork will have different, random Saturation and Gray Scale settings, but they will all be in the range of 0%-25% for Saturation and 0%-50% for Gray Scale.

Using this option can be great fun, especially with the Rotation or Brightness controls.  When used with these two controls, Randomize makes it very easy to recolor complex, single-color artwork.

LIVE!
Reduces the window size to include just Options menu indicator, the Tweak and Tint control buttons, and the OK and Cancel buttons. Allowing you to see your color changes applied to your actual art as you work in the extension.

To return to normal UI, reselect the LIVE! command or use the Command-L keyboard shortcut. (Keep the spacebar held down while reselecting this command if you do not want the black background when you return to the normal UI.)

Additive Tint, Shadow Tint, and Highlight Tint
Additive Tint will add the CMYK values to the color values of the selected artwork.  Entering negative values causes the CMYK values to be subtracted from the color values of the selected artwork. Shadow Tint evaluates the grayscale luminosity of the selected artwork and adds a tint percentage based on the luminosity amount (for example, 100% Cyan added to a grayscale ramp will add 100% cyan to black, 0% cyan to white, and 50% cyan to  50% gray, etc.)  Highlight  Tint is exactly the opposite of Shadow Tint, (for example, 100% Cyan added to a grayscale ramp will add 0% cyan to black, 100% cyan to white, and 50% cyan to  50% gray, etc.)

Tweaks
The Tweak controls let you modify various color attributes for your artwork quickly and easily. Press and drag on any of the control sliders in this section to modify the specified attribute.

Inversion
This slider can be used to reverse color values in your artwork. As you drag to the right your artwork colors will move from their original values, through gray, to their spectral opposites.

Gray Scale
This slider lets you remove color value from your artwork while preserving luminosity values, resulting in truer grayscale artwork than would result from simply desaturating.  Try the red and green experiment mentioned above, then reset and set Grayscale to 100%.  Note that the resulting grays are markedly different.

Brightness
This control slider moves colors in your selected artwork towards white or black. Dragging this slider to the right approaches white, thus increasing the brightness of your artwork, while dragging to the left approaches black, thus reducing the brightness.

Contrast
Dragging this slider to the right increases the contrast in your artwork. This is accomplished by evaluating the grayscale luminosity value of each color channel and moving gray values away from 50% in both directions.  Negative contrast will move those values on either side of 50% toward 50% (gray). Dragging to the left reduces the contrast.

Saturation
This slider determines the amount of color in your artwork. Dragging to the right increases the saturation, while dragging to the left decreases it. Desaturating removes color only, without maintaining luminosity (i.e., completely desaturating red or green will result in the same gray value for both).

Hue Rotation
Dragging this slider left or right shifts all colors in your artwork around a “color axis,” allowing you take make global changes to your artwork colors, while maintaining each color’s relative “distance” from neighboring colors.

Tints
The Tint controls let you add CMYK tints to your artwork. Each of the four sliders (Cyan, Magenta, Yellow, and Black) will allow you to increase or decrease the tint for that particular color as subtly or dramatically as desired. As always, dragging to the right will increase tint values, while dragging to the left decreases tint values.