PPMCIE(1) | General Commands Manual | PPMCIE(1) |
NAME¶
ppmcie - draw a CIE color chart as a PPM imageSYNOPSIS¶
ppmcie[-rec709|-cie|-ebu|-hdtv|-ntsc|-smpte] [-xy|-upvp] [-red rx ry] [-green gx gy] [-blue bx by] [-white wx wy] [-size edge] [-xsize|-width width] [-ysize|-height height] [-noblack] [-nowpoint] [-nolabel] [-noaxes] [-full]
All options can be abbreviated to their shortest unique prefix.
DESCRIPTION¶
ppmcie creates a PPM file containing a plot of the CIE ``tongue'' color chart -- to the extent possible in a PPM image. Alternatively, creates a pseudo-PPM image of the color tongue using RGB values from a color system of your choice.OPTIONS¶
- -rec709|-cie|-ebu|-hdtv|-ntsc|-smpte
- Select a standard color system whose gamut to plot. The
default is -rec709, which chooses CIE Rec. 709, gamma-corrected.
This is the only color system for which ppmcie's output is a true
PPM image. See explanation above. -ebu chooses the primaries used
in the PAL and SECAM broadcasting standards. -ntsc chooses the
primaries specified by the NTSC broadcasting system (few modern monitors
actually cover this range). -smpte selects the primaries
recommended by the Society of Motion Picture and Television Engineers
(SMPTE) in standards RP-37 and RP-145, and -hdtv uses the much
broader HDTV ideal primaries. -cie chooses a color system
that has the largest possible gamut within the spectrum of the chart. This
is the same color system as you get with the -cie option to John
Walker's cietoppm program.
- -xy
- plot CIE 1931 x y chromaticities. This is the default.
- -upvp
- plot u' v' 1976 chromaticities rather than CIE 1931 x y chromaticities. The advantage of u' v' coordinates is that equal intervals of distance on the u' v' plane correspond roughly to the eye's ability to discriminate colors.
- -red rx ry
- specifies the CIE x and y co-ordinates of the red illuminant of a custom color system and selects the custom system.
- -green gx gy
- specifies the CIE x and y co-ordinates of the green illuminant of the color system and selects the custom system.
- -blue bx by
- specifies the CIE x and y co-ordinates of the blue illuminant of the color system and selects the custom system.
- -white wx wy
- specifies the CIE x and y co-ordinates of the white point of the color system and selects the custom system.
- -size edge
- Create a pixmap of edge by edge pixels. The default is 512x512.
- -xsize|-width width
- Sets the width of the generated image to width pixels. The default width is 512 pixels. If the height and width of the image are not the same, the CIE diagram will be stretched in the longer dimension.
- -ysize|-height height
- Sets the height of the generated image to height pixels. The default height is 512 pixels. If the height and width of the image are not the same, the CIE diagram will be stretched in the longer dimension.
- -noblack
- Don't plot the black body chromaticity curve.
- -nowpoint
- Don't plot the color system's white point.
- -nolabel
- Omit the label.
- -noaxes
- Don't plot axes.
- -full
- Plot the entire CIE tongue in full intensity; don't enhance
the gamut of the specified color system.
SEE ALSO¶
ppmdither(1), ppmquant(1), ppm(5)AUTHOR¶
Copyright (C) 1995 by John Walker (kelvin@fourmilab.ch) WWW home page: http://www.fourmilab.ch/ Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, without any conditions or restrictions. This software is provided ``as is'' without express or implied warranty.26th September 1994 |