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Excuse me for my bad translated language!
I have a texture for the soil of 4096 x 4096 (let's say the TT texture). To draw some particulars I use a texture of 1024 x 1024 (let's say the TEXTURE PT). But the details of the PT texture above that of the TT soil, still appear very large. By intuition I noticed that if I create a copy of the PT texture with size 512 x 512 the drawing is more realistic (terrain to the right of the track). Question. To avoid this step (create smaller textures each time) is it possible to apply an "image scale" on the fly? Thank you very much.

Nope. You should prepare your textures in 512x512 size.

However, in the example I made an image. In reality, with Gimp I have to make a 4096x4096 one, then a 2048x2048 one, then a 1024x1204 one, then a 512x512 one, then a 256x256 one, until I find the right one. The right one is the one that best balances definition / MByte with respect to realism. It is a very tedious job because it must be repeated for all the textures that are used in the route and that take up space on the ssd. Thanks