- #58, Add new dithering alogirthm based on nthony Dekker's neuquant

  algorithm using http://pngnq.sourceforge.net/ with alpha support

2 files changed, 65 insertions, 0 deletions

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 26e2de4..882af2a 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -6,6 +6,7 @@ SET(TESTS_FILES
   tiffread
   tgaread
   crop
+	nnquant
 )
 
 FOREACH(test_name ${TESTS_FILES})
diff --git a/examples/nnquant.c b/examples/nnquant.c
new file mode 100644
index 0000000..6fcdc63
--- /dev/null
+++ b/examples/nnquant.c
@@ -0,0 +1,64 @@
+/* $Id$ */
+/*
+ * You can fetch a set of samples TIFF images here:
+ * ftp://ftp.remotesensing.org/pub/libtiff/
+ * (pics-x.y.z.tar.gz)
+ */
+
+#include "gd.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include "gd_resize.h"
+
+void save_png(gdImagePtr im, const char *filename)
+{
+	FILE *fp;
+	fp = fopen(filename, "wb");
+	if (!fp) {
+		fprintf(stderr, "Can't save png image %s\n", filename);
+		return;
+	}
+	gdImagePng(im, fp);
+	fclose(fp);
+}
+
+int main()
+{
+ 	gdImagePtr im, im2;
+	FILE *fp;
+	char path[2048];
+	char dst[2048];
+
+//	fp = fopen("/home/pierre/IMG_3801.jpg", "rb");
+	fp=fopen("resampledbug.jpeg", "rb");
+	//fp = fopen("/home/pierre/bug_new.png", "rb");
+	if (!fp) {
+		fprintf(stderr, "Can't load /home/pierre/IM3801.jpg\n");
+		return 1;
+	}
+
+	im = gdImageCreateFromJpeg(fp);
+	fclose(fp);
+	if (!im) {
+		fprintf(stderr, "Can't load TIFF image %s\n", path);
+		return 1;
+	}
+
+	im2 = gdImageNeuQuant(im, 256, 3);
+
+	if (im2) {
+		gdImageSaveAlpha(im2, 1);
+		save_png(im2, "a_nnquant.png");
+		gdImageDestroy(im2);
+	} else {
+		printf("neu quant failed.\n");
+	}
+
+	gdImageTrueColorToPalette(im, 1, 256);
+
+	gdImageSaveAlpha(im, 1);
+	save_png(im, "a_jquant_dither.png");
+
+	gdImageDestroy(im);
+	return 0;
+}