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1994-04-01
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AVG4(1) AVG4(1)
NNAAMMEE
avg4 - Downfilter an image by simple averaging.
SSYYNNOOPPSSIISS
aavvgg44 [ --oo _o_u_t_f_i_l_e ] [ _i_n_f_i_l_e ]
DDEESSCCRRIIPPTTIIOONN
_A_v_g_4 downfilters an RLE image into a resulting image of
1/4th the size, by simply averaging four pixel values in
the input image to produce a single pixel in the output.
If the original image does not contain an alpha channel,
avg4 creates one by counting the number of non-zero pixels
in each group of four input pixels and using the count to
produce a coverage value. While the alpha channel pro
duced this way is crude (only four levels of coverage) it
is enough to make a noticeable improvement in the edges of
composited images.
OOPPTTIIOONNSS
_i_n_f_i_l_e The input will be read from this file, otherwise,
input will be taken from stdin.
--oo _o_u_t_f_i_l_e
If specified, output will be written to this file,
otherwise it will go to stdout.
SSEEEE AALLSSOO
_f_a_n_t(1), _r_l_e_c_o_m_p(1), _s_m_u_s_h(1), _u_r_t(1), _R_L_E(5).
AAUUTTHHOORR
Rod Bogart, John W. Peterson
BBUUGGSS
Very simple minded - more elaborate filters could be
implemented.
1 Nov 12, 1986 1