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- ppppppppmmmmddddiiiitttthhhheeeerrrr((((1111)))) XXXXEEEENNNNIIIIXXXX SSSSyyyysssstttteeeemmmm VVVV ((((11114444 JJJJuuuullllyyyy 1111999999991111)))) ppppppppmmmmddddiiiitttthhhheeeerrrr((((1111))))
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- NNNNAAAAMMMMEEEE
- ppmdither - ordered dither for color images
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- ppppppppmmmmddddiiiitttthhhheeeerrrr [----ddddiiiimmmm _d_i_m_e_n_s_i_o_n] [----rrrreeeedddd _s_h_a_d_e_s] [----ggggrrrreeeeeeeennnn _s_h_a_d_e_s] [----
- bbbblllluuuueeee _s_h_a_d_e_s] [_p_p_m_f_i_l_e]
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- Reads a portable pixmap as input, and applies dithering to
- it to reduce the number of colors used down to the specified
- number of shades for each primary. The default number of
- shades is red=5, green=9, blue=5, for a total of 225 colors.
- To convert the image to a binary rgb format suitable for
- color printers, use -red 2 -green 2 -blue 2. The maximum
- number of colors that can be used is 256 and can be computed
- as the product of the number of red, green and blue shades.
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- OOOOPPPPTTTTIIIIOOOONNNNSSSS
- ----ddddiiiimmmm _d_i_m_e_n_s_i_o_n
- The size of the dithering matrix. Must be a
- power of 2.
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- ----rrrreeeedddd _s_h_a_d_e_s The number of red shades to be used; minimum
- of 2.
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- ----ggggrrrreeeeeeeennnn _s_h_a_d_e_s The number of green shades to be used; minimum
- of 2.
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- ----bbbblllluuuueeee _s_h_a_d_e_s The number of blue shades to be used; minimum
- of 2.
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- pnmdepth(1), ppmquant(1), ppm(5)
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- AAAAUUUUTTTTHHHHOOOORRRR
- Copyright (C) 1991 by Christos Zoulas.
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- Page 1 (printed 9/7/93)
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