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ppmtosixel.1
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Text File
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1995-07-25
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3KB
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67 lines
ppppppppmmmmttttoooossssiiiixxxxeeeellll((((1111)))) XXXXEEEENNNNIIIIXXXX SSSSyyyysssstttteeeemmmm VVVV ((((22226666 AAAApppprrrriiiillll 1111999999991111)))) ppppppppmmmmttttoooossssiiiixxxxeeeellll((((1111))))
NNNNAAAAMMMMEEEE
ppmtosixel - convert a portable pixmap into DEC sixel format
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
ppppppppmmmmttttoooossssiiiixxxxeeeellll [----rrrraaaawwww] [----mmmmaaaarrrrggggiiiinnnn] [_p_p_m_f_i_l_e]
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.
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.
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.
----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.
PPPPRRRRIIIINNNNTTTTIIIINNNNGGGG
Generally, sixel files must reach the printer unfiltered.
Use the lpr -x option or cat filename > /dev/tty0?.
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.
SSSSEEEEEEEE AAAALLLLSSSSOOOO
ppm(5)
AAAAUUUUTTTTHHHHOOOORRRR
Copyright (C) 1991 by Rick Vinci.
Page 1 (printed 9/7/93)