•	Duotone (8-bit)	•	Paletted (8-bit)
•	RGB color (24-bit)	•	Lab color (24-bit)
•	CMYK color (32-bit)	•	Multichannel
•	Grayscale (16-bit)	•	RGB color (48-bit)
•	NTSC RGB (video)	•	PAL RGB (video)

To change the color mode of an image

•Click Image ` Color mode, and click one of the following:

•Grayscale (8-bit)

•RGB color (24-bit)

•Lab color (24-bit)

•CMYK color (32-bit)

•Multichannel

•Grayscale (16-bit)

•RGB color (48-bit)

•NTSC RGB

•PAL RGB

Changing images to the paletted color mode

The paletted color mode, also called indexed color mode, is frequently used for GIF images on the World Wide Web. When you convert a complex image to the paletted color mode, a fixed color value is assigned to each pixel. These values are stored in a compact color table, or palette. As a result, the paletted image contains less data than the original, and it has a smaller file size. Paletted color mode is an 8-bit mode that stores and displays images using up to 256 colors.

Choosing, editing, and saving a color palette

When you change an image to the paletted color mode, you use a predefined or a custom color palette and then edit the palette by replacing individual colors. If you choose the Optimized color palette, you can also edit the palette by specifying a range sensitivity color. The color palette you use to convert the image is called the processed color palette, and it can be saved for use with other images.

374	CorelDRAW Graphics Suite 12 User Guide

Dithering

Paletted images can only contain up to 256 different colors. If the original image contains many colors, you can use dithering to create the illusion of seeing more than 256 colors. Dithering creates additional colors and shades from an existing palette by interspersing pixels of different colors. The relationship of one colored pixel to another creates an optical mix, so you perceive additional colors.

Dithering can be done by distributing colors either regularly or randomly. Ordered dithering approximates color blends using regular dot patterns; as a result, solid colors are emphasized and edges appear harder. Error diffusion scatters pixels randomly, making edges and colors softer. Jarvis, Stucki and Floyd-Steinberg are methods of error diffusion.

If your image contains only a few colors and simple shapes, you do not need to use dithering.

To change an image to the paletted color mode

1Click Image ` Color mode ` Paletted (8-bit).

2Click the Options tab.

3Choose one of the following color palette types from the Palette list box:

•Uniform — provides a range of 256 colors with equal parts of red, green, and blue

•Standard VGA — provides the Standard VGA 16-color palette

•Adaptive — provides colors original to the image, and preserves the individual

colors (the entire color spectrum) in the image

•Optimized — creates a color palette based on the highest percentage of colors in the image. You can also select a range sensitivity color for the color palette.

•Black Body — contains colors that are based on temperature. For example, black may represent cold temperatures, while red, orange, yellow, and white may represent hot temperatures.

•Grayscale — provides 256 shades of gray, ranging from black (0) to white (255)

•System — provides a palette of Websafe and grayscale colors

•Websafe — provides a palette of 216 colors that are common to Web browsers

4Choose a dithering option from the Dithering list box.

5Move the Dither intensity slider to adjust the amount of dithering.

Corel PHOTO-PAINT: Changing color modes

375

You can also

Save the conversion options as a preset	Click Add preset , and type a name in the
	Save preset box.
Edit the processed color palette	Click the Processed palette tab, and click
	Edit. In the Color table dialog box, edit the
	color palette.
Save the processed color palette	Click the Processed palette tab, and click
	Save. Choose the folder where you want to
	save the processed color palette, and type a
	filename.

The Ordered dithering option applies more quickly than do the error diffusion options Jarvis, Stucki, and Floyd-Steinberg; however, it is less accurate.

You can choose a custom color palette by clicking the Options tab, clicking Open, locating the color palette file you want, and double-clicking the filename.

From here

For more information about	In the Help index, see...
Changing images to the black-and-white	black-and-white color mode
color mode
Changing images to the duotone color mode	duotone
Setting the color range for a custom color	color palette, color range
palette
Changing multiple files to the paletted color	paletted color mode, converting files to
mode

376	CorelDRAW Graphics Suite 12 User Guide