Would it be possible to support side by side image comparison? I was unable to find another image browser that offers this certain functionality. XNView has something but it puts two images side by side and not really on top of each other with a slider.
Arnold has a nice workflow for comparing in its renderview, you'd have snapshots on the bottom, right click one and set as A and right click another and set as B, then A would be on top of B with a slider in the center, left or right to show more A/B.
Right now to compare I pressing the left and right arrow key but it only works if the file order is correct or if the images are in the same directory.