Step 1: Load two or more images of colliding galaxies NGC 2207 and IC 2163 below.

Step 2: Choose the WCS->reproject menu option to align the images (using
Montage/mProjectPP from IPAC). Try aligning to Chandra.

Step 3: Adjust scale, contrast, bias, colormap for each image, as usual ...
or click below to set a demo-ready contrast/bias for each image.

Step 4: Use the Image Blending plugin above to choose a blend mode/opacity
for your images ('screen' is good) and activate blending for each one.

Step 5: If necessary, turn on Image Blending. You can toggle the blending
of individual images, or change their colormaps, scales, contrast/bias ...