Assetbundle-loaded images not readable

I have a project that needs to import an asset bundle, then read the texture data on every one of the meshes. Since the textures are created in realtime, there is no “read/write enabled” option in the editor anywhere. The textures are not readable after importing the bundle.
Can anyone shed any light on how I could read these textures after import?

Many thanks.

I’m not using assetbundles, but shouldn’t the readable flag be part of the asset when you build the assetbundle? Have you changed the import settings of your textures when you imported them before creating the assetbundle?