UV Mapping with large Pictures

I mean, I can make UV-Mapping with one 400x2048 Texture, so it should be possible to arrange more textures so I can use 400x2048*n, or?

This Texture Compression is a good Idea, I’m searching for a lossles method. Because for the exposure it is important that the data is clean and not change by a lossy algorithm.

not sure if there is any lossless compression of textures. but yeah check and let us know.
http://www.opengl.org/sdk/docs/man/xhtml/glCompressedTexImage2D.xml

Do you know waht I mean with “to arrange more textures”?

sorry no. multiple textures with same uv set?? and describe <arrange> a bit more.

would not advice to use non power of two values still. but that depends what hardware you are targeting. for older hardware no can go.