diff --git a/src/test.c b/src/test.c
index bbae8b3..fe7f627 100644
--- a/src/test.c
+++ b/src/test.c
@@ -7,6 +7,71 @@
 
 #include <cammy/sram.h>
 
+static uint32_t bayer_matrix[256] = {
+    /*
+     * Black gamut
+     */
+    0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+
+    /*
+     * Black to dark gray gradient
+     */
+    0x00018000, 0x00018000, 0x00018000, 0x00018000, 0x00018000, 0x00018000,
+    0x00018020, 0x00018020, 0x00018020, 0x00018020, 0x00018020, 0x00018020,
+    0x000180a0, 0x000180a0, 0x000180a0, 0x000180a0, 0x000180a0, 0x000180a0,
+    0x0001a0a0, 0x0001a0a0, 0x0001a0a0, 0x0001a0a0, 0x0001a0a0, 0x0001a0a0,
+    0x0001a4a0, 0x0001a4a0, 0x0001a4a0, 0x0001a4a0, 0x0001a4a0, 0x0001a4a0,
+    0x0001a4a1, 0x0001a4a1, 0x0001a4a1, 0x0001a4a1, 0x0001a4a1,
+    0x0001a4a5, 0x0001a4a5, 0x0001a4a5, 0x0001a4a5, 0x0001a4a5,
+    0x0001a5a5, 0x0001a5a5, 0x0001a5a5, 0x0001a5a5, 0x0001a5a5,
+    0x0001ada5, 0x0001ada5, 0x0001ada5, 0x0001ada5, 0x0001ada5,
+    0x0001ada7, 0x0001ada7, 0x0001ada7, 0x0001ada7, 0x0001ada7,
+    0x0001adaf, 0x0001adaf, 0x0001adaf, 0x0001adaf, 0x0001adaf,
+    0x0001afaf, 0x0001afaf, 0x0001afaf, 0x0001afaf, 0x0001afaf,
+    0x0001df5f, 0x0001df5f, 0x0001df5f, 0x0001df5f, 0x0001df5f,
+    0x0001df7f, 0x0001df7f, 0x0001df7f, 0x0001df7f, 0x0001df7f,
+    0x0001dfff, 0x0001dfff, 0x0001dfff, 0x0001dfff, 0x0001dfff,
+    0x0001ffff, 0x0001ffff, 0x0001ffff, 0x0001ffff, 0x0001ffff,
+
+    /*
+     * Dark gray to light gray gradient
+     */
+    0x01028000, 0x01028000, 0x01028000, 0x01028000, 0x01028000,
+    0x01028020, 0x01028020, 0x01028020, 0x01028020, 0x01028020,
+    0x010280a0, 0x010280a0, 0x010280a0, 0x010280a0, 0x010280a0,
+    0x0102a0a0, 0x0102a0a0, 0x0102a0a0, 0x0102a0a0, 0x0102a0a0,
+    0x0102a4a0, 0x0102a4a0, 0x0102a4a0, 0x0102a4a0, 0x0102a4a0,
+    0x0102a4a1, 0x0102a4a1, 0x0102a4a1, 0x0102a4a1, 0x0102a4a1,
+    0x0102a4a5, 0x0102a4a5, 0x0102a4a5, 0x0102a4a5, 0x0102a4a5,
+    0x0102a5a5, 0x0102a5a5, 0x0102a5a5, 0x0102a5a5, 0x0102a5a5,
+    0x0102ada5, 0x0102ada5, 0x0102ada5, 0x0102ada5, 0x0102ada5,
+    0x0102ada7, 0x0102ada7, 0x0102ada7, 0x0102ada7, 0x0102ada7,
+    0x0102adaf, 0x0102adaf, 0x0102adaf, 0x0102adaf, 0x0102adaf,
+    0x0102afaf, 0x0102afaf, 0x0102afaf, 0x0102afaf, 0x0102afaf,
+    0x0102df5f, 0x0102df5f, 0x0102df5f, 0x0102df5f, 0x0102df5f,
+    0x0102df7f, 0x0102df7f, 0x0102df7f, 0x0102df7f, 0x0102df7f,
+    0x0102dfff, 0x0102dfff, 0x0102dfff, 0x0102dfff, 0x0102dfff,
+    0x0102ffff, 0x0102ffff, 0x0102ffff, 0x0102ffff, 0x0102ffff,
+
+    /* Light gray to white gradient */
+    0x02038000, 0x02038000, 0x02038000, 0x02038000, 0x02038000,
+    0x02038020, 0x02038020, 0x02038020, 0x02038020, 0x02038020,
+    0x020380a0, 0x020380a0, 0x020380a0, 0x020380a0, 0x020380a0,
+    0x0203a0a0, 0x0203a0a0, 0x0203a0a0, 0x0203a0a0, 0x0203a0a0,
+    0x0203a4a0, 0x0203a4a0, 0x0203a4a0, 0x0203a4a0, 0x0203a4a0,
+    0x0203a4a1, 0x0203a4a1, 0x0203a4a1, 0x0203a4a1, 0x0203a4a1,
+    0x0203a4a5, 0x0203a4a5, 0x0203a4a5, 0x0203a4a5, 0x0203a4a5,
+    0x0203a5a5, 0x0203a5a5, 0x0203a5a5, 0x0203a5a5, 0x0203a5a5,
+    0x0203ada5, 0x0203ada5, 0x0203ada5, 0x0203ada5, 0x0203ada5,
+    0x0203ada7, 0x0203ada7, 0x0203ada7, 0x0203ada7, 0x0203ada7,
+    0x0203adaf, 0x0203adaf, 0x0203adaf, 0x0203adaf, 0x0203adaf,
+    0x0203afaf, 0x0203afaf, 0x0203afaf, 0x0203afaf, 0x0203afaf, 0x0203afaf,
+    0x0203df5f, 0x0203df5f, 0x0203df5f, 0x0203df5f, 0x0203df5f, 0x0203df5f,
+    0x0203df7f, 0x0203df7f, 0x0203df7f, 0x0203df7f, 0x0203df7f, 0x0203df7f,
+    0x0203dfff, 0x0203dfff, 0x0203dfff, 0x0203dfff, 0x0203dfff, 0x0203dfff,
+    0x0203ffff, 0x0203ffff, 0x0203ffff, 0x0203ffff, 0x0203ffff, 0x0203ffff
+};
+
 static void usage(int argc, char **argv, const char *message, ...) {
     if (message) {
         va_list args;
@@ -34,19 +99,27 @@ static void image_copy(cammy_sram_frame *frame, uint8_t *buf) {
 
     for (y=0; y<CAMMY_SRAM_PHOTO_HEIGHT; y++) {
         for (x=0; x<CAMMY_SRAM_PHOTO_WIDTH; x++) {
-            uint8_t r = buf[4*CAMMY_SRAM_PHOTO_WIDTH*y+4*x],
-                    g = buf[4*CAMMY_SRAM_PHOTO_WIDTH*y+4*x+1],
-                    b = buf[4*CAMMY_SRAM_PHOTO_WIDTH*y+4*x+2];
-
-            float avg = 255.0 - ((float)r + (float)g + (float)b) / 3;
-
-            uint8_t value = (uint8_t)(avg / 64.0);
-
             cammy_sram_tile *tile = &frame->photo.tiles[y>>3][x>>3];
 
             int tile_x = x & 7,
                 tile_y = y & 7;
 
+            uint8_t r = buf[4*CAMMY_SRAM_PHOTO_WIDTH*y+4*x],
+                    g = buf[4*CAMMY_SRAM_PHOTO_WIDTH*y+4*x+1],
+                    b = buf[4*CAMMY_SRAM_PHOTO_WIDTH*y+4*x+2];
+
+            uint8_t  avg  = (uint8_t)(((float)r + (float)g + (float)b) / 3);
+            uint32_t slot = bayer_matrix[avg];
+            uint32_t from = (slot & 0x03000000) >> 24;
+            uint32_t to   = (slot & 0x00030000) >> 16;
+            uint8_t  value;
+
+            if (slot & (0x8000 >> (x & 0x03) >> (y & 0x03))) {
+                value = to   ^ 0x03;
+            } else {
+                value = from ^ 0x03;
+            }
+
             tile->data[2*tile_y]   |=  (value & 0x01)       << (7 - tile_x);
             tile->data[2*tile_y+1] |= ((value & 0x02) >> 1) << (7 - tile_x);
         }