png_set_dither
Name
png_set_dither -- turn on dithering to 8-bit
Synopsis
void
png_set_dither(png_structp
png_ptr, png_colorp
palette, int
num_palette, int
maximum_colors, png_uint_16p
histogram, int
full_dither);
Description
png_set_dither() shall set transformation to dither file to 8-bit. For the given
palette with num_palette number of colors, the number of colors in the palette
shall be reduced to fit in "maximum_colors" if the palette is larger than
maximum_colors. If supplied, the histogram is used to get better results of the
reduced palette.
For reducing the number of colors in palette, full_dither must be set to 0. If
full_dither is set to 1, dithering cube shall be setup for RGB images to reduce
the RGB file to a paletted file.
