You can convert images to the Paletted color mode by choosing one of ten palette types.
To convert a bitmap to the Paletted color mode
1 Select the bitmap with the Pick tool.
2 Click Bitmaps, Mode, Paletted (8-bit).
3 In the Convert To Paletted dialog box, click the Options tab.
4 From the Palette list box, choose a palette type.
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 — samples the image and uses the first 256 colors to create the palette
Optimized — contains colors centered on the image's spectrum of colors. If you choose Optimized, you can enable the Color Range Sensitivity To check box and choose a color from the Color Palette
Black Body — contains colors that are based on temperature, e.g., black (cold), red, orange, yellow, and white (hot)
Grayscale — provides 256 shades of gray, ranging from black (0) to white (255)
System — contains the predefined palette of colors used by your operating system
Microsoft Internet Explorer — contains the predefined Microsoft Internet Explorer colors
Netscape Navigator — contains the predefined Netscape Navigator colors
Custom — allows you to add colors to create your own customized color palette. If you choose Custom, click the Open button beside the Palette list box, locate the custom palette in the Open Palette dialog box, and click Open.
5 From the Dithering list box, choose a dithering option.
• Ordered — approximates color blends using fixed dot patterns
• Jarvis — approximates color blends by applying the error diffusion Jarvis algorithm to individual pixels
• Stucki — approximates color blends by applying the error diffusion Stucki algorithm to individual pixels
• Floyd-Steinberg — approximates color blends by applying the error diffusion Floyd-Steinberg algorithm to individual pixels
6 Move the Dither Intensity slider to set the intensity of the conversion.
• You can preview the colors that are used to create the paletted image in the Preview window in the Convert To Paletted dialog box. Previewing lets you alter the conversion options before you permanently apply the effect to the image.
• The Ordered dithering option applies more quickly than the Error Diffusion options (Jarvis, Stucki, and Floyd-Steinberg) but is less accurate.
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