... channel. That is used in graphics editor programs, but serves no purpose in Templot. There is no visible effect on the image on the trackpad. This should also make for faster rendering and panning on the trackpad. Picture shape images are converted to 24-bit colour in any event when saved and reloaded in the .sk8n files. But to avoid the palaver of saving and reloading files if you are having zooming problems with a picture shape, I have added a button on the background shapes dialog to perform the conversion: 2_131920_120000000.png In the next program update 215b. regards, Martin. posted: 14 Sep 2017 16:59 from: Alan Turner Martin Wynne wrote: In fact the old County Series 25" maps are not referenced to lat and lon at all, or even the OS National Grid which came later. Each County had its own map origin. That's why it is a lot of work for the NLS to convert the individual sheet scans to a slippy map of the whole of Great Britain, georeferenced on the overlay to modern maps ...