Some graphics cards may handle this badly.
I used to have an nvidia vanta which displayed junk when I tried to load a very wide image, about 5000 pixels.
But I could load and properly display an even bigger image with the same card. This bigger image was so large it would not fit into the 16mb of graphics memory. Apparently Blitz then loaded it into system RAM and copied only the required portion to the screen display each frame.
I used to have an nvidia vanta which displayed junk when I tried to load a very wide image, about 5000 pixels.
But I could load and properly display an even bigger image with the same card. This bigger image was so large it would not fit into the 16mb of graphics memory. Apparently Blitz then loaded it into system RAM and copied only the required portion to the screen display each frame.