B

Task/Bitmap-Histogram/C/bitmap-histogram-4.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "imglib.h"
+
+/* usage example */
+
+#define BLACK 0,0,0
+#define WHITE 255,255,255
+
+int main(int argc, char **argv)
+{
+    image color_img;
+    grayimage g_img;
+    histogram h;
+    luminance T;
+    unsigned int x, y;
+
+    if ( argc < 2 )
+    {
+       fprintf(stderr, "histogram FILE\n");
+       exit(1);
+    }
+    color_img = read_image(argv[1]);
+    if ( color_img == NULL ) exit(1);
+    g_img = tograyscale(color_img);
+    h = get_histogram(g_img);
+    if ( h != NULL )
+    {
+          T = histogram_median(h);
+
+          for(x=0; x < g_img->width; x++)
+          {
+            for(y=0; y < g_img->height; y++)
+            {
+               if ( GET_LUM(g_img,x,y) < T )
+               {
+                   put_pixel_unsafe(color_img, x, y, BLACK);
+               } else {
+                   put_pixel_unsafe(color_img, x, y, WHITE);
+               }
+            }
+          }
+          output_ppm(stdout, color_img);
+          /* print_jpg(color_img, 90); */
+          free(h);
+    }
+
+    free_img((image)g_img);
+    free_img(color_img);
+}