Premultiplied display mode

[Lex-DRL]

Some files (EXR specifically) often contain color in a premultiplied format. It would be nice if XnView had an option to display them as such. Currently, a fully-additive premultiplied EXR (e.g., containing only an additive fire in color but a fully transparent alpha channel) is displayed as fully transparent.

I'm attaching an example image. It contains a fire with very transparent alpha, but a lot of glow in RGB. It should be drawn as very bright mostly-additive (but partially opaque, too). Instead, it's displayed by XnView as barely visible and very dark (a well-documented effect of double pre-multiplication).

How it should be displayed:

_right.jpg

The current XnView behavior:

_wrong.jpg

_Fire.7z

Preferably, there should be:

• a per-file-type premultiplied/un-premultiplied display-mode association, with most (or all) of the files being associated to "un-premultiplied" mode by default (and only EXR and, maybe, TIFF being set to premultiplied);
• a hotkey to switch this mode on the fly.

P.S.: sorry if an option is already there. I tried to find it, but failed.