version 1, including all changes.
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perry |
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ppmtosixel |
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!!!ppmtosixel |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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OPTIONS |
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PRINTING |
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BUGS |
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SEE ALSO |
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AUTHOR |
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---- |
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!!NAME |
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ppmtosixel - convert a portable pixmap into DEC sixel format |
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!!SYNOPSIS |
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__ppmtosixel__ [[__-raw__] [[__-margin__] |
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[[''ppmfile''] |
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!!DESCRIPTION |
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Reads a portable pixmap as input. Produces sixel commands |
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(SIX) as output. The output is formatted for color printing, |
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e.g. for a DEC LJ250 color inkjet printer. |
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If RGB values from the PPM file do not have maxval=100, the |
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RGB values are rescaled. A printer control header and a |
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color assignment table begin the SIX file. Image data is |
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written in a compressed format by default. A printer control |
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footer ends the image file. |
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!!OPTIONS |
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__-raw__ |
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If specified, each pixel will be explicitly described in the |
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image file. If __-raw__ is not specified, output will |
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default to compressed format in which identical adjacent |
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pixels are replaced by |
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__ |
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__-margin__ |
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If __-margin__ is not specified, the image will be start |
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at the left margin (of the window, paper, or whatever). If |
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__-margin__ is specified, a 1.5 inch left margin will |
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offset the image. |
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!!PRINTING |
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Generally, sixel files must reach the printer unfiltered. |
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Use the lpr -x option or cat filename |
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!!BUGS |
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Upon rescaling, truncation of the least significant bits of |
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RGB values may result in poor color conversion. If the |
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original PPM maxval was greater than 100, rescaling also |
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reduces the image depth. While the actual RGB values from |
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the ppm file are more or less retained, the color palette of |
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the LJ250 may not match the colors on your screen. This |
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seems to be a printer limitation. |
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!!SEE ALSO |
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ppm(5) |
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!!AUTHOR |
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Copyright (C) 1991 by Rick Vinci. |
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