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9.6. The Indexed mode

This command converts your image to indexed mode. See Glossary for explanations about the Indexed Color Mode.

9.6.1. Activate Dialog

This command can be accessed from an image menubar as Image → Mode → Indexed.

9.6.2. Options

This option opens the Convert Image to Indexed Colors dialog:

Figure 10.51. Options

General Palette Options

Generate Optimale Palette : This option generates the best possible palette with a default maximum number of 256 colors (classical GIF format). You can reduce this Maximum Number of Colors . This may create unwanted effects on smooth transitions. You can reduce them by using a dithering option.
Use Black and White (1-bit) Palette : This option generates line-art images.
Use Custom Palette : The button allows you to select a custom palette in a list. The number of colors is indicated for each palette. The Web palette, 216 colors, is the Web-safe palette. It was originally created by Netscape to provide colors that would look the same on both Macs and PCs and Internet Explorer 3 could manage it. Since version 4, MSIE handles a 212 colors palette... This problem of color similarity between all platforms is not solved yet and probably will never be. You have to keep to two principles in your Web page: light text on dark background or dark text on light background and never entrust an information to a color.

Some colors of the palette may not be used if your image is poorly colored. They will be removed from the palette if the option Remove Unused Colors from the Final Palette is checked.

Dithering Options

As an indexed image contains 256 colors or less, some colors in the original image may be absent in the palette. This may result in some blotchy or solid colors in subtle color areas. These options allows you to correct these unwanted effects induced by the Palette Options.

The filter will attempt to approximate the missing color by spreading pixels of the nearest palette colors going clustering. These clustered pixels seen from a distance simulate a new color. See the glossary for more information on dithering .

Three filters are available. It's not possible to foresee what the result of a specific filter will be and you will have to try all to get the best result. The Positioned Color Dithering is well adapted to animations.

Figure 10.52. Example full color no dithering

Here is the image of a smooth transition as an example.

Figure 10.53. Example 4 colors no dithering

After transformation to GIF 4 colors without dithering.

Figure 10.54. Example Floyd-Steinberg (normal)

GIF 4 colors with Floyd-Sternberg (normal).

Figure 10.55. Example Floyd-Steinberg 4 colors

GIF 4 colors with Floyd-Sternberg-2.

In a GIF image transparency is coded on 1 bit: transparent or not transparent. To give an illusion of partial transparency use the option Enable Dithering of Transparency , but the semi-flatten plugin will give you a better result.

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