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- ppmtosixel(1) AMIGA (26 April 1991) ppmtosixel(1)
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- NAME
- ppmtosixel - convert a portable pixmap into DEC sixel format
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- SYNOPSIS
- ppmtosixel [-raw] [-margin] [ppmfile]
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- DESCRIPTION
- Reads a portable pixmap as input. Produces sixel commands
- (SIX) as output. The output is formatted for color
- printing, 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
- RGB values are rescaled. A printer control header and a
- color assignment table begin the SIX file. Image data is
- written in a compressed format by default. A printer
- control footer ends the image file.
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- OPTIONS
- -raw If specified, each pixel will be explicitly described
- in the image file. If -raw is not specified, output
- will default to compressed format in which identical
- adjacent pixels are replaced by "repeat pixel"
- commands. A raw file is often an order of magnitude
- larger than a compressed file and prints much slower.
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- -margin
- If -margin is not specified, the image will be start at
- the left margin (of the window, paper, or whatever).
- If -margin is specified, a 1.5 inch left margin will
- offset the image.
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- PRINTING
- Generally, sixel files must reach the printer unfiltered.
- Use the lpr -x option or cat filename > /dev/tty0?.
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- BUGS
- Upon rescaling, truncation of the least significant bits of
- RGB values may result in poor color conversion. If the
- original PPM maxval was greater than 100, rescaling also
- reduces the image depth. While the actual RGB values from
- the ppm file are more or less retained, the color palette of
- the LJ250 may not match the colors on your screen. This
- seems to be a printer limitation.
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- SEE ALSO
- ppm(5)
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- AUTHOR
- Copyright (C) 1991 by Rick Vinci.
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- Page 1 (printed 10/19/91)
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