Wrong. The only person being disingenuous here is you. Modifying or adjusting curves could also refer with the curves in the image. - https://docs.gimp.org/2.10/en/plug-in-curve-bend.html
I also noticed that you blatantly ignored the other query. How did this warped picture from that author produce circular concentric star trails?
You know you're being beyond disingenuous becasue I know you know what "curves" means in GIMP, photoshop, etc. As well, why didn't you post the technical specs for the photo I posted, which is right here:
Technical information
Location: Observatorio del Teide, Tenerife, Canary Islands
Date and time: 2015 March 14-15, 20:20 WET - 02:20 WET
Camera: Nikon D5100
Mount: Baader Astro & Nature tripod
Optics: Samyang AE 10 mm
Exposure: 620 x 34 sec., ISO 1600, f/4.8
Processing: Adobe Lightroom (NEF development); ProStack (stacking);
Adobe Photoshop (curve adjustment)http://bartoszwojczynski.com/picture-150315-startrailsSee that in bold, Adobe Photoshop (curve adjustment). And I know you know what that refers to:
In short: You take specs from another photo and use it so it seems more ambiguous rather than using the specs from the actual photo where Photoshop "curve adjustment" means one thing only. And you know exactly what it means. Stop playing games.