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- ppmtopgm(1) Unix Programmer's Manual ppmtopgm(1)
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- NNNAAAMMMEEE
- ppmtopgm - convert a portable pixmap into a portable graymap
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- SSSYYYNNNOOOPPPSSSIIISSS
- ppppppmmmtttooopppgggmmm [_p_p_m_f_i_l_e]
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- DDDEEESSSCCCRRRIIIPPPTTTIIIOOONNN
- Reads a portable pixmap as input. Produces a portable graymap as output.
- The quantization formula used is .299 r + .587 g + .114 b.
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- 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.
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- QQQUUUOOOTTTEEE
- 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.
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- SSSEEEEEE AAALLLSSSOOO
- pgmtoppm(1), ppmtorgb3(1), rgb3toppm(1), ppm(5), pgm(5)
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- AAAUUUTTTHHHOOORRR
- Copyright (C) 1989 by Jef Poskanzer.
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- 23 December 1988 1
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