xComp

xComp is an image viewer developed by GUGEN studio Inc. capable of building composites of a stack of images with transparent regions.

This tool was built to visualize region updates of a render on top of previous renders, in real-time. Images found in a chosen folder to scan for, are quickly composited with alpha blending in a stack. OpenColorIO transformations are optionally added to the composite image, which can be saved out as a PNG.

Note that because ordering of compositing is dictated by file name, images should be titled by a timestamp, or with a sequential number.

xComp is also useful to quickly view EXR images and their various layers.

Video introduction here
https://www.youtube.com/watch?v=3xMG6HqRzgA

You can get access to the source code at this link ↓↓
https://github.com/gugenstudio/xComp

User Manual here
https://gugenstudio.github.io/xComp/