When the game is paused, the game takes a fullscreen "screenshot" and draws it under the menu UI. This texture seems to ignore the specified forced resolution, and it's 16-bit. In my case, I have 1024x768 selected in-game, and so is this background image:

It results in the background becoming blurry and with color banding.
D2GI_V2 fixes this partially with its HUD correction fix - in there, this "screenshot" is still 16-bit, but when playing in 1920x1080, the "screenshot" is 1600x900.
Looking at the sequence of calls in PIX, this seems to be D2GIBlitter::Blit?
When the game is paused, the game takes a fullscreen "screenshot" and draws it under the menu UI. This texture seems to ignore the specified forced resolution, and it's 16-bit. In my case, I have 1024x768 selected in-game, and so is this background image:

It results in the background becoming blurry and with color banding.
D2GI_V2 fixes this partially with its HUD correction fix - in there, this "screenshot" is still 16-bit, but when playing in 1920x1080, the "screenshot" is 1600x900.
Looking at the sequence of calls in PIX, this seems to be
D2GIBlitter::Blit?