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ppmtolss16 — Convert a PPM to an LSS16 image |
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ppmtolss16 [ |
#rrggbb=i |
...] [< input.ppm] [> output.rle] |
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This manual page documents briefly the ppmtolss16 command. The ppmtolss16 program converts a "raw" PPM file with max 16 colors to a simple RLE-based format: simple RLE-based format |
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Color map is in 6-bit format (each byte is 0..63) Then, a sequence of nybbles: N ... if N is != previous pixel, one pixel of color N, otherwise run sequence follows ... M ... if M > 0 then run length is M+1, otherwise run sequence is encoded in two nybbles, littleendian, +17 The nybble sequences are on a per-row basis, runs may not extend across rows and odd-nybble rows are zero-padded. At the start of a row, the "previous pixel" is assumed to be zero. |
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A summary of options is included below. |
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#rrggbb=i |
Specify that the color #rrggbb (hex) should be assigned index i (decimal). |
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This program cannot handle comments in the header, nor "plain" ppm format. |
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ppmtolss16(1) |
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This manual page was compiled by dann frazier <dannf@debian.org> for the Debian GNU/Linux system (but may be used by others). Most of the content was written by H. Peter Anvin. |