[tgsovlerkhgsel]

I'm not talking about constraining a line to a 90 degree angle. I'm talking about "draw a single straight line from one point to another". Most editors have a dedicated tool for that. In Gimp, you take the brush, then shift-click start and end.

How do you do the solid color background in Gimp? In Photoshop, I'd select the background with the magic wand (contiguous or non-contiguous, depending on preference), potentially use one of those edge-improving tools, then either press delete or create a mask. It apparently also has a special tool for it that I haven't used before but seems to do basically that.

[easrng]

Oh, OK. Regarding the background: That works, and you do the same thing in GIMP but that doesn't handle transparency. In GIMP there's the Color to Alpha tool which is pretty much magic.

[easrng]

Say you have https://this.is-a-professional-domain.com/4Hhtqcf.jpg and you want that glow on a transparent background. In GIMP, I'd select the chip, Select>Invert, Color>Color to Alpha and it would just work. I tried to do it in Photoshop and couldn't figure it out.

[IvanK_net]

BTW. I added Color to Alpha into Photopea: Filter - More - Color to Alpha. Works 100% same as in Gimp :)