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Add image-hint for low-color images.

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For low-color images, it may be better to not use color-palettes.
Users should treat this as one another hint (as with Photo &
Picture) and another parameter for tuning the compression density.
The optimum compression can still be obtained by running (outer loop)
compression with all possible tunable parameters.

Change-Id: Icb1a4face2a84774e16e801aee4a8ae97e232e8a
This commit is contained in:
Vikas Arora
2012-07-31 23:07:52 -07:00
parent 4eb7aa64da
commit dd1c3873fe
6 changed files with 10 additions and 7 deletions
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4
examples/cwebp.c
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@ -844,7 +844,7 @@ static void HelpLong(void) {
printf(" -noalpha ............... discard any transparency information.\n");
printf(" -lossless .............. Encode image losslessly.\n");
printf(" -hint <string> ......... Specify image characteristics hint.\n");
printf(" One of: photo or picture\n");
printf(" One of: photo, picture or graph\n");
printf("\n");
printf(" -short ................. condense printed message\n");
@ -973,6 +973,8 @@ int main(int argc, const char *argv[]) {
config.image_hint = WEBP_HINT_PHOTO;
} else if (!strcmp(argv[c], "picture")) {
config.image_hint = WEBP_HINT_PICTURE;
} else if (!strcmp(argv[c], "graph")) {
config.image_hint = WEBP_HINT_GRAPH;
} else {
fprintf(stderr, "Error! Unrecognized image hint: %s\n", argv[c]);
goto Error;