Section: User Commands (1)
Updated: 10 October 1991
AutoCAD has a fixed palette of 256 colours, distributed along the hue, lightness, and saturation axes. Pixmaps which contain many nearly-identical colours, or colours not closely approximated by AutoCAD's palette, may be poorly rendered.
ppmtoacad works best if the system displaying its output supports the full 256 colour AutoCAD palette. Monochrome, 8 colour, and 16 colour configurations will produce less than optimal results.
When creating a .dxb file or a slide file with the -poly option, ppmtoacad finds both vertical and horizontal runs of identical pixels and consolidates them into rectangular regions to reduce the size of the output file. This is effective for images with large areas of constant colour but it's no substitute for true raster to vector conversion. In particular, thin diagonal lines are not optimised at all by this process.
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