Changing Drawing to Black and White Illustrator

Shift an out-of-gamut color to a printable color

Some colors in the RGB and HSB color models, such as neon colors, cannot be printed, because they have no equivalents in the CMYK model. If you select an out-of-gamut color, an alert triangle appears in the Color panel or Color Picker.

Shift a color to a web-safe color

Web-safe colors are the 216 colors used by all browsers, regardless of the platform. If you select a color that is not web-safe, an alert cube appears in the Color panel, Color Picker, or Edit Colors/Recolor Artwork dialog box.

The Blend commands create a series of intermediate colors from a group of three or more filled objects, based on the objects' vertical or horizontal orientation, or on their stacking order. Blending does not affect strokes or unpainted objects.

Change a color to its inverse or complement

Change the tint of a color

Adjust color balance of one or more colors

Change the color mode of a document

Display and output spot colors using Lab values

Some predefined spot colors, such as colors from the TOYO, PANTONE, DIC, and HKS libraries, are defined using Lab values. For backward compatibility with previous versions of Illustrator, colors from these libraries also include CMYK definitions. The Swatches panel lets you control which values, Lab or CMYK, Illustrator uses to display, export, and print these spot colors.

Lab values, when used in conjunction with the correct device profiles, give you the most accurate output across all devices. If color management is critical to your project, Adobe recommends that you display, export, and print spot colors using their Lab values.

To improve on‑screen accuracy, Illustrator uses the Lab values automatically if Overprint Preview is on. It also uses Lab values when printing if you've selected Simulate for the Overprints option in the Advanced area of the Print dialog box.

Convert color to grayscale and vice versa

Convert colors to grayscale

Convert grayscale images to RGB or CMYK

Colorize grayscale or 1-bit images

Adjust the saturation of multiple colors

You can use blending modes, the Hard Mix effect, or the Soft Mix effect to mix overlapping colors.

Blending modes

Provide many options for controlling overlapping colors, and should always be used in place of Hard Mix and Soft Mix for artwork containing spot colors, patterns, gradients, text, or other complex artwork.

Hard Mix effect

Combines colors by choosing the highest value of each of the color components. For example, if Color 1 is 20% cyan, 66% magenta, 40% yellow, and 0% black; and Color 2 is 40% cyan, 20% magenta, 30% yellow, and 10% black, the resulting hard color is 40% cyan, 66% magenta, 40% yellow, and 10% black.

Soft Mix effect

Makes the underlying colors visible through the overlapping artwork, and then divides the image into its component faces. You specify the percentage of visibility you want in the overlapping colors.

You can apply blending modes to individual objects, whereas you must apply the Hard Mix and Soft Mix effects to entire groups or layers. Blending modes affect both the fill and stroke of an object, whereas the Hard and Soft Mix effects result in removal of an object's stroke.

In most cases, applying the Hard Mix or Soft Mix effect to objects painted using a mix of process and spot colors converts the color to CMYK. In the case of mixing a non-global process RGB color with a spot RGB color, all spot colors are converted to a non-global process RGB color.

Mix colors using the Hard Mix effect

Mix colors using the Soft Mix effect

Changing Drawing to Black and White Illustrator

Source: https://helpx.adobe.com/illustrator/using/adjusting-colors.html