Change Details

https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Mansur-2.png/999px-Mansur-2.png and https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Mansur-2.png/1000px-Mansur-2.png Have very faint grey lines. A similar issue was observed when using vips shrink to scale tiff files by non-integral factors (But I believe pngs used to be fine). https://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&oldid=168011781#Very_large_PNG_thumbnails_getting_black_lines_in_them