03-17-2013
i made the correction in my sample code - see initial post above
Thx
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LEARN ABOUT SUSE
pfsgamma
pfsgamma(1) General Commands Manual pfsgamma(1)
NAME
pfsgamma - Apply gamma correction to color or gray-scale images
SYNOPSIS
pfsgamma [--gamma <gamma> | --inverse-gamma <inv-gamma>] [--mul <multiplier>]
DESCRIPTION
Use this command to gamma correct a stream of pfs images. Gamma correction is equivalent to raising value of R, G and B (or Y for gray-
scale images) channels to 1/gamma power. More information on gamma correction can be found at:
http://www.poynton.com/notes/colour_and_gamma/GammaFAQ.html
This command can work on color images, in which case XYZ channels are transformed to RGB space, then they are gamma corrected before they
are converted back to XYZ. For gray-scale images (only Y channel and XZ missing) gamma correction is applied only to Y channel.
Data can be multiplied by an optional multiplier before gamma correction.
Note: gamma correction will set the 'LUMINANCE' tag to 'DISPLAY' thus cancelling any sRGB correction when saving to LDR files (like PPM,
TIFF). This will also cause a warning message when saving to HDR files, because the intensities after gamma correction are not linearly
related to luminance any more.
OPTIONS
--gamma <gamma>, -g <gamma>
Perform gamma correction (input^(1/gamma)). This can be used to convert images from relative luminance or radiance to pixel values.
Default value: 1.0
--inverse-gamma <inv-gamma>, -i <inv-gamma>
Perform inverse gamma correction (input^(gamma)). This can be used to convert images from pixel values to relative radiance or lumi-
nance.
--mul <mul>, -m <mul>
Multiply data by this value before gamma correction. Default value: 1
EXAMPLES
pfsin memorial.hdr | pfsgamma -g 1.8 -m 10 | pfsout memorial_gc.ppm
Multiply memorial image by 10, gamma correct it and save to memorial_gc.ppm.
SEE ALSO
pfsin(1) pfsout(1) pfsdisplayfunction(1)
BUGS
Please report bugs and comments to the pfstools discussion group (http://groups.google.com/group/pfstools).
pfsgamma(1)