53 lines
895 B
C
53 lines
895 B
C
#include "gd.h"
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#include <stdio.h>
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#include <stdlib.h>
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void save_png(gdImagePtr im, const char *filename)
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{
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FILE *fp;
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fp = fopen(filename, "wb");
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if (!fp) {
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fprintf(stderr, "Can't save png image %s\n", filename);
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return;
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}
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gdImagePng(im, fp);
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fclose(fp);
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}
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int main()
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{
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gdImagePtr im, im2;
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FILE *fp;
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fp=fopen("resampledbug.jpeg", "rb");
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if (!fp) {
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fprintf(stderr, "Can't load resampledbug.jpeg\n");
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return 1;
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}
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im = gdImageCreateFromJpeg(fp);
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fclose(fp);
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if (!im) {
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fprintf(stderr, "Can't decode JPEG image resampledbug.jpeg\n");
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return 1;
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}
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im2 = gdImageNeuQuant(im, 256, 3);
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if (im2) {
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gdImageSaveAlpha(im2, 1);
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save_png(im2, "a_nnquant.png");
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gdImageDestroy(im2);
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} else {
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printf("neu quant failed.\n");
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}
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gdImageTrueColorToPalette(im, 1, 256);
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gdImageSaveAlpha(im, 1);
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save_png(im, "a_jquant_dither.png");
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gdImageDestroy(im);
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return 0;
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}
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