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- ppppppppmmmmttttoooossssiiiixxxxeeeellll((((1111)))) XXXXEEEENNNNIIIIXXXX SSSSyyyysssstttteeeemmmm VVVV ((((22226666 AAAApppprrrriiiillll 1111999999991111)))) ppppppppmmmmttttoooossssiiiixxxxeeeellll((((1111))))
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- NNNNAAAAMMMMEEEE
- ppmtosixel - convert a portable pixmap into DEC sixel format
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- ppppppppmmmmttttoooossssiiiixxxxeeeellll [----rrrraaaawwww] [----mmmmaaaarrrrggggiiiinnnn] [_p_p_m_f_i_l_e]
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- 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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- OOOOPPPPTTTTIIIIOOOONNNNSSSS
- ----rrrraaaawwww If specified, each pixel will be explicitly described
- in the image file. If ----rrrraaaawwww 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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- ----mmmmaaaarrrrggggiiiinnnn
- If ----mmmmaaaarrrrggggiiiinnnn is not specified, the image will be start at
- the left margin (of the window, paper, or whatever).
- If ----mmmmaaaarrrrggggiiiinnnn is specified, a 1.5 inch left margin will
- offset the image.
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- PPPPRRRRIIIINNNNTTTTIIIINNNNGGGG
- Generally, sixel files must reach the printer unfiltered.
- Use the lpr -x option or cat filename > /dev/tty0?.
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- BBBBUUUUGGGGSSSS
- 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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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- ppm(5)
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- AAAAUUUUTTTTHHHHOOOORRRR
- Copyright (C) 1991 by Rick Vinci.
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- Page 1 (printed 9/7/93)
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