Operation Manual

Working with bitmap color modes | 567
Dithering
Changing images to the paletted color mode lets you use dithering to enhance color information. Dithering places pixels with specific colors
or values relative to other pixels of a specific color. The relationship of one colored pixel to another creates the appearance of additional
colors that do not exist in the color palette.
You can use two types of dithering: ordered dithering and error diffusion. Ordered dithering approximates color blends using fixed dot
patterns; as a result, solid colors are emphasized and edges appear harder. Error diffusion scatters pixels irregularly, making edges and colors
softer. Jarvis, Stucki, and Floyd-Steinberg are conversion options that provide error diffusion.
The Ordered dithering option applies more quickly than the error diffusion options (Jarvis, Stucki, and Floyd-Steinberg) but is less accurate.
Specifying a range-sensitivity color
You can change an image to the paletted color mode and specify a focus color and a range sensitivity for the focus color, so that the focus
color and colors that fall within the range settings are included in the processed color palette. You can also specify how much emphasis to
place on the range sensitivity. Because the palette has a maximum of 256 colors, emphasizing a focus color reduces the number of colors
that fall outside the range sensitivity.
Palette types
The table below outlines available palette types.
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Palette type Description
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 specify a range-sensitivity color for
the color palette. This is the most common color palette for
photographic images.
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 to white
System Provides the predefined palette of colors used by the operating
system
Web-safe Provides a predefined palette of 216 non-dithered colors that
will display the same on most browsers. This palette is not
recommended for use with photographs and only benefits users
with older computers.