took sqrt of iterations in color calc to brighten glow

main.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <math.h>
 #include <sys/wait.h>
 #include <sys/mman.h>
 
@@ -66,7 +67,7 @@ void draw_mandelbrot(int width, int height, int iterations) {
             //int g = (ret * 9 / iterations);
             //int b = (ret * 165 / iterations);
             //image_set_px(img, x, y, r,g,b);
-            int color = 255 * ret / (float) iterations;
+            int color = 255 * sqrt(ret / (float) iterations);
             image_set_px(img, x, y, color, color, color);
         }
     }