Would you be doing this with the 3d commands, even if it's 2d? Because if you intended to do it in pure 2d, some videocards won't let you load an image which is bigger than the screen res. So in that case, I would, at the very least, break it into screen-sized chunks.
You're not worrying about nothing, because Blitz doesn't offer any kind of texture compression and lots of big images will eat up your videoram pretty fast. If you can use tiles, I would highly recommend it. I would be tempted to use 3d for the whole thing, but perhaps just 2d-in-3d ( flat meshes ) for speed of rotation and scaling. It might make it easier to make your maps with tiles that way too.
And yes, the search function on this website is broken.
You're not worrying about nothing, because Blitz doesn't offer any kind of texture compression and lots of big images will eat up your videoram pretty fast. If you can use tiles, I would highly recommend it. I would be tempted to use 3d for the whole thing, but perhaps just 2d-in-3d ( flat meshes ) for speed of rotation and scaling. It might make it easier to make your maps with tiles that way too.
And yes, the search function on this website is broken.