generic-library/webp
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fix -print_psnr / ssim options

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original/compressed pictures were not converted to an adequate YUVA
colorspace before computing the distortion.

Change-Id: I37775e9b7dbd6eca16c38e235e1df325858d36a1
This commit is contained in:
Pascal Massimino 2013-12-04 02:17:37 -08:00
parent cc55790e37
commit ebef7fb307
1 changed files with 16 additions and 2 deletions
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18
examples/cwebp.c
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@ -1045,8 +1045,22 @@ int main(int argc, const char *argv[]) {
if (!quiet && !short_output && print_distortion >= 0) { // print distortion
static const char* distortion_names[] = { "PSNR", "SSIM", "LSIM" };
float values[5];
WebPPictureDistortion(&picture, &original_picture,
print_distortion, values);
// Comparison is performed in YUVA colorspace.
if (original_picture.use_argb &&
!WebPPictureARGBToYUVA(&original_picture, WEBP_YUV420A)) {
fprintf(stderr, "Error while converting original picture to YUVA.\n");
goto Error;
}
if (picture.use_argb &&
!WebPPictureARGBToYUVA(&picture, WEBP_YUV420A)) {
fprintf(stderr, "Error while converting compressed picture to YUVA.\n");
goto Error;
}
if (!WebPPictureDistortion(&picture, &original_picture,
print_distortion, values)) {
fprintf(stderr, "Error while computing the distortion.\n");
goto Error;
}
fprintf(stderr, "%s: Y:%.2f U:%.2f V:%.2f A:%.2f Total:%.2f\n",
distortion_names[print_distortion],
values[0], values[1], values[2], values[3], values[4]);