How to crop an image without losing color values

Software Siril
5

Here’s some more context anyway.

In Siril 0.9.12 for Linux I opened a FITS image converted with debayer from a DNG shot of the Moon I took with my Pixel 4 XL phone at 2X optical zoom. Here’s what the image looked like after adjusting the sliders for the various channels:

fullframe
fullframe1920×1080 2.14 MB

Then I cropped an approximately square area 2-3X larger than the crescent and here’s what I got:

crop
crop1920×1080 955 KB

I had to switch to Histogram and Zoom to fit to make the cropped portion appear again, with the expected color.

I’m using Siril for Linux on the Debian Linux subsystem (Crostini) of Chrome OS.