No. There is no way to take an image texture and make a procedural texture out of it. The two are fundamentally different. An image texture uses a fixed amount of data - represented by the pixels in the image - to provide the textural information. A procedural texture is theoretically infinite in the amount of data it can represent, since it is based on math functions and algorithms. Apples and oranges. So no, you cannot edit .brt files (procedural textures) in an external editor. No, you cannot bring a picture (jpg, gif, bmp, whatever) into the Texture Library. Yes, you can save image textures in "Picture Lists", although the utility of this is dubious. You can freely go from procedural to image textures using the P/T button in the Materials lab for each channel, but the two are completely different creatures. In fact, if you make a procedural texture for an object, then switch to "picture" (image) texture mode, Bryce will NOT attempt to convert the procedural texture to an image, although this is, in theory at least, possible. The reverse conversion is, in general, not possible. If you just want to get a limited picture of a procedural texture, here's what you can do: find a procedural texture you like, go into the Deep Texture Editor, and option/alt-click on the 'combined' swatch (I think.... it might be another key combination, I'm not sure). This will render that texture really large on the screen. Use a screen-capture utility to get an image of the texture, save it, edit in photoshop, or whatever. It is now, however, an IMAGE texture and cannot be made into a procedural texture again. It does not tile correctly. It might not even look right - certain effects such as slope, orientation, altitude, etc. will be non-existant. You'll have to 'wrap' it around objects - it doesn't live in 3D space the way a procedural texture does. It is a severely limited way of generating textures. KPT texture explorer is generallly a superior way of doing exactly this, since it has much more control over tiling, noise patterns, etc. But it's still fundamentally an image generator, and image textures are totally different from procedural textures.