diff --git a/TERMINALS.md b/TERMINALS.md
index 68713c6ed..c017d30f0 100644
--- a/TERMINALS.md
+++ b/TERMINALS.md
@@ -17,7 +17,8 @@ relies on the font. Patches to correct/complete this table are very welcome!
 
 | Terminal        | Pixel `TIOCGWINSZ` | `ccc` | Blocks | Recommended environment           | Notes |
 | --------------- | ------------------ | ----- | ------ | -----------------------           | ----- |
-| [Alacritty](https://github.com/alacritty/alacritty)       | ✅                 |  ✅   |❌      |`TERM=alacritty` `COLORTERM=24bit` | Sixel support WIP: https://github.com/ayosec/alacritty/tree/graphics |
+| [Alacritty](https://github.com/alacritty/alacritty)       | ✅                 |  ✅   |❌      |`TERM=alacritty` `COLORTERM=24bit` | [Sixel support WIP](https://github.com/ayosec/alacritty/tree/graphics) |
+| [Contour](https://github.com/christianparpart/contour)    | ❌                 |  ✅   |?       |`TERM=contour-latest` ?            | Claims Sixel support             |
 | [FBterm](https://github.com/zhangyuanwei/fbterm)          | ❌                 |  ?    |?       |`TERM=fbterm`                      | 256 colors, no RGB color. |
 | [foot](https://codeberg.org/dnkl/foot)            | ✅                 |  ✅   |✅      |`TERM=foot`                        | Sixel support. |
 | [Gnome Terminal](https://gitlab.gnome.org/GNOME/gnome-terminal)  |                    |  ❌   |✅      |`TERM=gnome` `COLORTERM=24bit`     | `ccc` support *is* available when run with `vte-256color`. |
diff --git a/src/lib/kitty.c b/src/lib/kitty.c
index f6c32274b..5da60b40a 100644
--- a/src/lib/kitty.c
+++ b/src/lib/kitty.c
@@ -291,8 +291,12 @@ write_kitty_data(FILE* fp, int linesize, int leny, int lenx,
             }else if(tacache[tyx] == SPRIXCELL_OPAQUE){
               tacache[tyx] = SPRIXCELL_MIXED;
             }
-          }else if(tacache[tyx] == SPRIXCELL_TRANSPARENT){
-            tacache[tyx] = SPRIXCELL_MIXED;
+          }else{
+            if(x % cdimx == 0 && y % cdimy == 0){
+              tacache[tyx] = SPRIXCELL_OPAQUE;
+            }else if(tacache[tyx] == SPRIXCELL_TRANSPARENT){
+              tacache[tyx] = SPRIXCELL_MIXED;
+            }
           }
         }
         ++x;
diff --git a/src/lib/render.c b/src/lib/render.c
index b859f1733..a2f71345c 100644
--- a/src/lib/render.c
+++ b/src/lib/render.c
@@ -7,7 +7,8 @@
 
 // Check whether the terminal geometry has changed, and if so, copies what can
 // be copied from the old lastframe. Assumes that the screen is always anchored
-// at the same origin.
+// at the same origin. Initiates a resize cascade for the pile containing |pp|.
+// The current terminal geometry, changed or not, is written to |rows|/|cols|.
 static int
 notcurses_resize_internal(ncplane* pp, int* restrict rows, int* restrict cols){
   notcurses* n = ncplane_notcurses(pp);
@@ -64,6 +65,7 @@ notcurses_resize_internal(ncplane* pp, int* restrict rows, int* restrict cols){
   return ret;
 }
 
+// Check for a window resize on the standard pile.
 static int
 notcurses_resize(notcurses* n, int* restrict rows, int* restrict cols){
   pthread_mutex_lock(&n->pilelock);
@@ -72,6 +74,8 @@ notcurses_resize(notcurses* n, int* restrict rows, int* restrict cols){
   return ret;
 }
 
+// write(2) until we've written it all. Uses poll(2) to avoid spinning on
+// EAGAIN, at a small cost of latency.
 static int
 blocking_write(int fd, const char* buf, size_t buflen){
 //fprintf(stderr, "writing %zu to %d...\n", buflen, fd);
@@ -115,6 +119,7 @@ int nccell_duplicate(ncplane* n, nccell* targ, const nccell* c){
   return 0;
 }
 
+// deprecated, goes away in abi3
 int cell_duplicate(struct ncplane* n, nccell* targ, const nccell* c){
   return nccell_duplicate(n, targ, c);
 }
diff --git a/src/lib/sixel.c b/src/lib/sixel.c
index 4e63e1af4..642a44699 100644
--- a/src/lib/sixel.c
+++ b/src/lib/sixel.c
@@ -170,23 +170,25 @@ extract_color_table(const uint32_t* data, int linesize, int cols,
       for(int sy = visy ; sy < (begy + leny) && sy < visy + 6 ; ++sy){ // offset within sprixel
         const uint32_t* rgb = (data + (linesize / 4 * sy) + visx);
         int txyidx = (sy / cdimy) * cols + (visx / cdimx);
-        if(rgba_trans_p(*rgb, bargs->transcolor)){
-          if(tacache[txyidx] == SPRIXCELL_OPAQUE){
-            if(sy % cdimy == 0 && visx % cdimx == 0){
-              tacache[txyidx] = SPRIXCELL_TRANSPARENT;
-            }else{
-              tacache[txyidx] = SPRIXCELL_MIXED;
-            }
-          }
-          stab->p2 = SIXEL_P2_TRANS;
-          continue;
-        }else if(tacache[txyidx] == SPRIXCELL_TRANSPARENT){
-          tacache[txyidx] = SPRIXCELL_MIXED;
-        }
         if(tacache[txyidx] == SPRIXCELL_ANNIHILATED){
 //fprintf(stderr, "TRANS SKIP %d %d %d %d (cell: %d %d)\n", visy, visx, sy, txyidx, sy / cdimy, visx / cdimx);
           continue;
         }
+        if(rgba_trans_p(*rgb, bargs->transcolor)){
+          if(sy % cdimy == 0 && visx % cdimx == 0){
+            tacache[txyidx] = SPRIXCELL_TRANSPARENT;
+          }else if(tacache[txyidx] == SPRIXCELL_OPAQUE){
+            tacache[txyidx] = SPRIXCELL_MIXED;
+          }
+          stab->p2 = SIXEL_P2_TRANS; // even one forces P2=1
+          continue;
+        }else{
+          if(sy % cdimy == 0 && visx % cdimx == 0){
+            tacache[txyidx] = SPRIXCELL_OPAQUE;
+          }else if(tacache[txyidx] == SPRIXCELL_TRANSPARENT){
+            tacache[txyidx] = SPRIXCELL_MIXED;
+          }
+        }
         unsigned char comps[RGBSIZE];
         break_sixel_comps(comps, *rgb, mask);
         int c = find_color(stab, comps);
diff --git a/src/lib/sprite.c b/src/lib/sprite.c
index 6c02f7e08..cbcfa4fc4 100644
--- a/src/lib/sprite.c
+++ b/src/lib/sprite.c
@@ -12,7 +12,7 @@ sprixel_debug(FILE* out, const sprixel* s){
     int idx = 0;
     for(int y = 0 ; y < s->dimy ; ++y){
       for(int x = 0 ; x < s->dimx ; ++x){
-        fprintf(out, "%d ", s->n->tacache[idx]);
+        fprintf(out, "%d", s->n->tacache[idx]);
         ++idx;
       }
       fprintf(out, "\n");