IrfanView has an extremely niche feature that literally no other image editor I've found, not even Photoshop, can do, called Remove/Insert strip. I literally use this regularly for work and have donated to the dev because of it, but would like to try to find something open-source that does this if possible.

Let's say you have an image which is comprised of 3 rows: ABC (there aren't literal rows with lines, but we could just say the top 33% of the image is A, the middle 33% is B, and the remainder is C).

IrfanView can crop out just B (or any similar interior portion) and have A and C touch each other, in a single menu click after you've selected the portion-to-delete. It can also do this as columns, if ABC were treated as vertical columns instead.

It can also inject X amount of pixels in either height or width at any specified location in the middle of the image of whatever color you specify. This is also powerful, as I sometimes have to replicate part of an image elsewhere in the image (they're sheet music), so being able to generate that placeholder and the immediately putting actual contents in the injected space is really helpful.

These are insanely creative features that I literally can't find any other program capable of doing, open- or closed-source. Any guidance towards an alternative would be great!