It has been a while since the last optipng run (it was in 2015),
and many non-optimized PNG files have accumulated in the repository.
288 of 1666 files optimized, 258992 bytes reduced to 156258 bytes; -102734 bytes, -39.66%
To avoid unnecessarily increasing the size of Git repository for minor
size reductions, we skip images that weren't reduced by at least 15%.
The selection-border corners were designed to be an overlay over the
edges, but GUI2 uses them adjoining to the edge images.
This has been fixed by manually overlaying them in the images
themselves.
Overall statistics (only for files with a smaller recompressed size):
Original size: 16720 KiB on 404 files
Optimized size: 15237 KiB
Total saving: 1482 KiB = 8% decrease
Overall statistics (only for files with a smaller recompressed size):
Original size: 485 KiB on 277 files
Optimized size: 447 KiB
Total saving: 37 KiB = 7% decrease
(not commiting any files that were reported as broken, there are many!)
Original size: 130846 KiB on 10530 files
Optimized size: 127520 KiB
Total saving: 3325 KiB = 2% decrease
Overall statistics (only for files with a smaller recompressed size):
Original size: 38348 KB on 1487 files
Optimized size: 37219 KB
Total saving: 1128 KB = 2% decrease
1) create a new grayscale image in gimp with 100x100 and 72dpi
2) fill the whole with black
3) in layer settings change the opacity to the value wanted
