Thanks for the info it's important. On this case the .scr is just cropping the image, another format would be better (as Einar mentioned).
All these titles are marked as ZX81 Hi-res: WRX , right ?
Meanwhile, you might have noticed that ZX80 and ZX81 titles now display a white border by default.
There's also progress on displaying different border colours (using the existing .SCR and .GIFs), yet more work is needed.
This so that you guys know that this discussion is helpful and things are progressing in the background.