Option to disable transparency in texture previews

[Jampi0n]

Is your feature request related to a problem? Please describe.
Using .dds preview to compare textures can be very difficult, if they contain a lot of transparency.

Describe the solution you'd like

• Add a button next to "Pick background color" that toggles transparency.
• Additionally, there could be some other indicator that the texture has transparency. For example at the bottom after the texture format/size.

Describe alternatives you've considered

• Opening the file in an image processing program and removing the transparency. Then hide the texture and continue with the next conflicting texture. Compare the images inside the image processing program, but never save them. Unhide the images again.

Additional context
Skyrim uses the alpha channel of textures for other purposes such as specularity. Because of that, many textures have very low alpha values and are next to invisible. This makes it impossible to compare these textures with the current .dds preview.

Comparison with transparency:

Comparison without transparency: