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- RLEQUANT(1) RLEQUANT(1)
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- NNAAMMEE
- rlequant - variance based color quantization for RLE
- images
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- SSYYNNOOPPSSIISS
- rrlleeqquuaanntt [ --bb _b_i_t_s ] [ --cc ] [ --dd ] [ --ff ] [ --mm ] [ --nn _c_o_l_
- _o_r_s ] [ --oo _o_u_t_f_i_l_e ] [ _i_n_f_i_l_e ]
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- DDEESSCCRRIIPPTTIIOONN
- This program quantizes the colors in an RLE image using a
- variance-based method. See _c_o_l_o_r_q_u_a_n_t(3) for more details
- on the method.
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- --bb _b_i_t_s
- The colors in the input image will be "prequan
- tized" to this many bits before applying the vari
- ance-based method. Two internal tables of size
- 22^^((33**bits)) are allocated, so values of _b_i_t_s greater
- than 6 are likely to cause thrashing or may prevent
- the program from running at all. The default value
- of _b_i_t_s is 5. It must be less than or equal to 8
- and greater than 0.
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- --cc Only the color map will be output; the image will
- not be digitized. The output file will be a 0x0
- _R_L_E file with a color map, suitable for input to
- _r_l_e_l_d_m_a_p(1) or _r_l_e_d_i_t_h_e_r(1).
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- --dd Floyd Steinberg dithering is performed on the out
- put. This is very helpful for images being quan
- tized to a small number of colors.
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- --ff If this option is specified, a faster approximation
- will be used. In most cases, the error so intro
- duced will be barely noticeable.
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- --mm Computes a single color map suitable for quantizing
- all the input images. This is useful when the
- quantized images will be used as a "movie" (e.g.,
- with the --mm flag of _g_e_t_x_1_1(1)). The input may not
- come from a pipe when this option is specified,
- unless --cc is also specified.
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- --nn _c_o_l_o_r_s
- The output image will be quantized to at most _c_o_l_
- _o_r_s colors. It might have fewer if the input image
- has only a few colors itself. The default value of
- _c_o_l_o_r_s is 256. It must be less than or equal to
- 256.
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- --oo _o_u_t_f_i_l_e
- The output will be written to the file _o_u_t_f_i_l_e. If
- not specified, or if _o_u_t_f_i_l_e is "-", the output
- will be written to the standard output stream.
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- RLEQUANT(1) RLEQUANT(1)
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- _i_n_f_i_l_e This file contains one or more concatenated RLE
- images. Each will be processed in turn. A sepa
- rate quantization map will be constructed for each
- image. If not specified, or if _i_n_f_i_l_e is "-", the
- image(s) will be read from the standard input
- stream.
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- SSEEEE AALLSSOO
- _m_c_u_t(1), _r_l_e_d_i_t_h_e_r(1), _u_r_t(1), _c_o_l_o_r_q_u_a_n_t(3), _R_L_E(5).
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- AAUUTTHHOORR
- Spencer W. Thomas
- Craig Kolb (Yale University) wrote the color quantization
- code.
- Rod Bogart wrote the dithering code.
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