How to change color of borders?

[progressneeded]

(02-06-2019, 12:49 PM)rich2005 Wrote: First thing, turn off the selection Select -> None

Then using Gimp 2.8 and reference to screenshots https://i.imgur.com/mUpKIHA.jpg

1. Enable the alpha lock top of the layers dialogue
2. Colors -> Color to Alpha using the default white.
3. With Foreground Color = Blue: click and drag the swatch into the canvas.
4. Reverse procedure, disable alpha lock top of layers dialogue
5. With Background color = White: Layer -> Transparency -> Remove Alpha channel

(02-06-2019, 04:30 PM)Ofnuts Wrote:

(02-06-2019, 03:24 PM)Ritergeek Wrote: Since the option rich2005 suggests does not appear to be available in 2.10, try inverting the selection (Ctrl+i) and delete the white background. The red will go with it. However, that leaves a rather jagged edge. As I look at the original image, I see the selection accurately reflects the current state of the edge. Copying the blue as selected and pasting into a new layer gives the same jagged result.

Here's how to get a smooth, crisp result without backing down to GIMP 2.8:
1) Open the Paths list and convert your existing selection to a path.
2) Convert that path back to a selection.
3) Create a new layer to ensure a clean result
4) Fill the new layer with blue or whatever color.

Color>Color to alpha or the alpha-lock are still there in 2.10. You can also replace C2A with painting in Color erase mode.

I am a noob, and I have the same question about removing borders on images. I have tried following both sets of these instructions, but I am not clear on how to apply some of the steps.

In the instructions Rich2005 posted (thanks for the screen shots), but when I get to step 3 (drag foreground swatch into the canvas, nothing happens. I click and drag, but there are no changes visible. I continued with the steps to check to see if the change would appear when the steps were completed. BUt, I end up with the same image I started out with.

In the instructions by Ritergeek I do not understand step 2. I convert the selection to a path, but do not know how to convert it back to a selection. So, I get no further in the process.

I am still working on understanding all of the terminology and features of GIMP. I appreciate any help offered.