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ppmtopgm.1
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1995-07-25
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67 lines
ppppppppmmmmttttooooppppggggmmmm((((1111)))) XXXXEEEENNNNIIIIXXXX SSSSyyyysssstttteeeemmmm VVVV ((((22223333 DDDDeeeecccceeeemmmmbbbbeeeerrrr 1111999988888888)))) ppppppppmmmmttttooooppppggggmmmm((((1111))))
NNNNAAAAMMMMEEEE
ppmtopgm - convert a portable pixmap into a portable graymap
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
ppppppppmmmmttttooooppppggggmmmm [_p_p_m_f_i_l_e]
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
Reads a portable pixmap as input. Produces a portable
graymap as output. The quantization formula used is .299 r
+ .587 g + .114 b.
Note that although there is a _p_g_m_t_o_p_p_m program, it is not
necessary for simple conversions from _p_g_m to _p_p_m, because
any ppm program can read _p_g_m (and _p_b_m ) files automagically.
_p_g_m_t_o_p_p_m is for colorizing a _p_g_m file. Also, see _p_p_m_t_o_r_g_b_3
for a different way of converting color to gray.
QQQQUUUUOOOOTTTTEEEE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SSSSEEEEEEEE AAAALLLLSSSSOOOO
pgmtoppm(1), ppmtorgb3(1), rgb3toppm(1), ppm(5), pgm(5)
AAAAUUUUTTTTHHHHOOOORRRR
Copyright (C) 1989 by Jef Poskanzer.
Page 1 (printed 9/7/93)