Name
pix-bw — combine pix color planes into a bw black and white image
Synopsis
pix-bw [-s squaresize] [-w width] [-n height] [
[-e ntsc|crt]
[
[ -R r_weight]
[ -G g_weight]
[ -B b_weight] ] ] [-o out.bw] [
[<]in.pix] > out.bw
DESCRIPTION
pix-bw will combine or select the color planes of a pix(5) format file from its standard input and produce a black and white bw(5) file on its standard output.
The
-w file_width
flag specifies the width of each scanline in the input file, in pixels.
The
-n file_height
flag specifies the height in scanlines of the input file.
They are set to the same value using
-s squarefilesize.
By default all three colors are weighted equally.
The
-e type
flag can be used to specify a standard weighting scheme;
the
type
choices include:
- ntsc
weighting used is based on the NTSC primaries and the D6500 alignment white.
- crt
weighting scheme used will be for "typical" CRT phosphor chromaticities and the D6500 white.
Individual color plane(s) can be selected via the
-R#, -G#,
and
-B#
options.
The value used with each flag
will be treated as a weight
to be applied to that color.
If 0 is supplied by the user for weights, then the weights assigned are 1.0 divided by the number of colors selected.
EXAMPLES
pix-bw -R0.0 -B0.0 < file.pix > file.bw
will equally blend the red and blue color planes; because -G is omitted, the green color plane is not considered. (Had "-G0.0" been included in this example, the three colors would have been weighted equally, as in the default condition.)
pix-bw -R0.30 -G0.59 -B0.11 < file.pix > file.bw
has the same effect as the
-ntsc
flag.
[The
-crt
weights are: 0.26, 0.66, 0.08]
