diff --git a/mandel.s b/mandel.s
index f777cbc..472f613 100644
--- a/mandel.s
+++ b/mandel.s
@@ -286,9 +286,9 @@ fill_masks:
     .byte %00000000
 
 pixel_masks:
-    .byte $ff
-    .byte $0f
-    .byte $03
+    .byte %11111111
+    .byte %11110000
+    .byte %11000000
 
 viewport_zoom:
     .byte 1
@@ -1188,18 +1188,15 @@ point:
     ; pixel_mask <<= pixel_shift (shifting in ones)
     and #3
     sta pixel_shift
-    lda #3
-    sec
-    sbc pixel_shift
     tax
 shift_loop:
     beq shift_done
-    asl pixel_color
-    asl pixel_color
+    lsr pixel_color
+    lsr pixel_color
     sec
-    rol pixel_mask
+    ror pixel_mask
     sec
-    rol pixel_mask
+    ror pixel_mask
     dex
     jmp shift_loop
 shift_done:
diff --git a/todo.md b/todo.md
index 284d653..e8cffe3 100644
--- a/todo.md
+++ b/todo.md
@@ -11,8 +11,7 @@ things to try:
 
 * y-axis mirror optimization
 
-* 'wide pixels' 2x and 4x for a fuller initial image in the tiered rendering
-  * maybe redo tiering to just 4x4, 2x2, 1x1?
+* try filling in the extra scanlines on 4x4 and 2x2 tiering
 
 * extract viewport for display & re-input via keyboard