| .TH "PPMTOLSS16" "1" |
| .SH "NAME" |
| ppmtolss16 \(em Convert a PPM to an LSS16 image |
| .SH "SYNOPSIS" |
| .PP |
| \fBppmtolss16\fR [ \fB \fI#rrggbb\fR=\fIi\fR \fP \&...] [< input.ppm] [> output.rle] |
| .SH "DESCRIPTION" |
| .PP |
| This manual page documents briefly the \fBppmtolss16\fR command. |
| |
| .PP |
| The \fBppmtolss16\fR program converts a "raw" PPM file with |
| max 16 colors to a simple RLE-based format: |
| |
| .PP |
| \fBsimple RLE-based format\fR |
| .TS |
| tab(); |
| l l. |
| unint32 0x1413f3dmagic (littleendian) |
| unint16 xsizelittleendian |
| unint15 ysizelittleendian |
| 16 x unint8 r,g,bcolor map |
| .TE |
| .PP |
| Color map is in 6-bit format (each byte is 0..63) |
| .PP |
| Then, a sequence of nybbles: |
| .PP |
| N ... if N is != previous pixel, one pixel of color N, otherwise |
| run sequence follows ... |
| |
| .PP |
| M ... if M > 0 then run length is M+1, otherwise run sequence is |
| encoded in two nybbles, littleendian, +17 |
| |
| .PP |
| The nybble sequences are on a per-row basis, runs may not extend across |
| rows and odd-nybble rows are zero-padded. |
| |
| .PP |
| At the start of a row, the "previous pixel" is assumed to be zero. |
| |
| .SH "OPTIONS" |
| .PP |
| A summary of options is included below. |
| .IP "\fB\fI#rrggbb\fR=\fIi\fR\fP" 10 |
| Specify that the color #rrggbb (hex) should be assigned index |
| i (decimal). |
| |
| .SH "BUG" |
| .PP |
| This program cannot handle comments in the header, nor "plain" ppm |
| format. |
| |
| .SH "SEE ALSO" |
| .PP |
| \fBppmtolss16\fR(1) |
| |
| .SH "AUTHOR" |
| .PP |
| This manual page was compiled by dann frazier <dannf@debian.org> for |
| the \fBDebian GNU/Linux\fP system (but may be used by others). Most of the content |
| was written by H. Peter Anvin. |
