... higher levels than 18 doesn't get you any more detail, the same level of detail is simply being zoomed larger. Most browsers use a resampling image upscaler to provide a smoother result than a simple stretch of each pixel. Such resampling isn't available in Templot when zooming background shapes on the trackpad, because at the high zoom levels we normally need it would take forever and reduce the screen response to a slow crawl through treacle. But the result isn't very pretty or comfortable to work over: 1. map tiles as loaded: 2_241521_110000000.png It can also be confusing -- see for example how the platform edge has merged with the rail above. A few updates back I added a function to reduce the contrast of map images when working over them, which makes it a lot easier to see what you are doing -- here on the left: 2. low-contrast converted original: 2_241521_120000001.png But it still doesn't match the screenshot captures from smooth browser resampling. So I have found some old resampling code from Anders Melander which could be used in Templot ...