Fixed grayscale handling in main.c and tricorn.c

Now grayscale files use a color pallete and in general should be smaller.

Implementierung/tricorn.c

@@ -7,6 +7,7 @@ void tricorn(float complex start, size_t width, ssize_t height, float res, unsig
     
     // Absolute height for iteration purposes
     height = height < 0 ?  height*-1 : height;
+    unsigned bytesPerColor = color ? 3 : 1;
 
     // Simple iteration over every pixel in the picture
     for(size_t i = 0; i < width; i++){
@@ -15,13 +16,11 @@ void tricorn(float complex start, size_t width, ssize_t height, float res, unsig
             unsigned value = converge(start + (i*res - I*j*res),n);
 
             // Pixel value position in the output array
-            size_t position = (j*width +i) *3;
+            size_t position = (j*width +i) * bytesPerColor;
 
 
             if(!color){ // Grayscale colors as specified by the assignment r = g = b
                 img[position] =  value;
-                img[position + 1] = value;
-                img[position + 2] = value;
             }
             else{ // Temporary colors with random multipliers
                 img[position] = ((value*3) % 255);