The hover and channels display (even thought checkmarks are hidden) is he most useful part of PVRTexToolGUI. But channel values are only displayed in the “Colour” panel if the image window is currently selected. I shouldn’t have to select the image window when I have 8 images up on-screen and I’m just comparing pixel values in one pixel to another. It also throws off using this, since color values are displayed for whatever pixel you were last on in the selected view (even though you are hovering over a new value in another image). This coupled with the erroneous sRGB display really makes it hard to verify if any image content is correct. I know the sRGB issue will be fixed in 20.2 when that releases.
Also an option to not premultiply alpha would also be welcome. Especially with ASTC LA for normals where they are stored as rrrg or gggr, it would be nice to swizzle them back and regen the z-value. Then the encoded version could be compared against the original png.