Lines Matching refs:gamma
186 wpng_info.gamma = 0.0;
192 * looks correct on the user's display system, its file gamma is the
208 * get the "gamma" value, so we do it the hard way */
259 } else if (!strncmp(*argv, "-gamma", 2)) {
263 wpng_info.gamma = atof(*argv);
264 if (wpng_info.gamma <= 0.0)
266 else if (wpng_info.gamma > 1.01)
405 "Usage: %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] pnmfile\n"
406 "or: ... | %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] | ...\n"
407 " exp \ttransfer-function exponent (``gamma'') of the image in\n"
409 "\t\t correct on given display system, image gamma is equal to\n"
