Lines Matching refs:gamma_correction
7886 double gamma_correction; /* Overall correction required. */
7984 vi->gamma_correction = 1/(dp->file_gamma*dp->screen_gamma);
7985 if (fabs(vi->gamma_correction-1) < PNG_GAMMA_THRESHOLD)
7986 vi->gamma_correction = 0;
8088 * just use the gamma_correction field to correct to the final output gamma.
8110 if (alpha >= 0 && vi->gamma_correction > 0)
8111 encoded_sample = pow(encoded_sample, vi->gamma_correction);
8588 if (vi->gamma_correction > 0)
8591 pos = safecatd(msg, sizeof msg, pos, vi->gamma_correction, 2);
8707 processing = (vi.gamma_correction > 0 && !dp->threshold_test)