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+--- Thread: Adding alpha to make a rectanglular image, square (/Thread-Adding-alpha-to-make-a-rectanglular-image-square)
Adding alpha to make a rectanglular image, square - Summoner99 - 01-22-2020
I'm fairly new to gimp, so this might be a really obvious question, and I definitely might have missed this answer during my internet search.
I have a rectangular black and white image that is taller than it is wide (but a solution that applies to one that is wider than it is tall would be great as well). I'd like to add transparent pixels on either side so that when I export it as a png, its size is square, but the original part of the image is still centered nicely.
The best idea I have is to create a square image of only transparent pixels then select the entirety of the original image and paste it onto this new image and somehow keep it centered.
Again, I am a beginner so I'm pretty positive there is a better solution.
Thanks in advance.
Edit:
Turns out what I thought of was a fairly easy solution
RE: Adding alpha to make a rectanglular image, square - denzjos - 01-22-2020
On the top layer :
- add alpha channel (right mouse button)
- make a square selection
- inverse the selection (selection / invert)
- Colours / Colour to Alpha
[attachment=3840]
RE: Adding alpha to make a rectanglular image, square - Blighty - 01-22-2020
Use Image > Canvas Size
1. Set value of Height (or Width) so that W and H have the same value.
2. Press "Center"
3. Press "Resize"
RE: Adding alpha to make a rectanglular image, square - Ofnuts - 01-22-2020
You can also "uncrop" the image (use the Crop tool and tick the "Allow growing" option)