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• load one channel by cmd-clicking it in the Channels Panel
• Select > Inverse (cmd-shift-I)
• set the Forground Color to Black (hit D)
• Layer > New Fill Layer > Solid Color
• hide the Background Layer
• Image > Canvas Size with whatever settings you want to use
• save as a psd
To center the Layer you can Select > Select All, Layer > Align Layer to Selection > …
Thanks for your reply. How do I hide the Background Layer?
Also, I can now resize the canvas but how do I resize the door image? They still move together.
Are all of your canvas sizes going to be a consistant size? Door images too? Is that number important? You could try this:
1. make the image a active layer (layer 1 instead of background)
2. select everything outside of the door shape (using magic wand + add the number with lasso)
3. delete that part of the image - it goes transparent.
4. go to image, trim, all transparent pixels, all you are left with now is the door part of the image.
5. go to image size, and set the pixel dimensions of the door (hopfully not upsampling)
6. flatten image
7. go to canvas size, set the size you want (as long as it's bigger than the door) and a 1 to 1 ratio you should now have a square background.
I know this seems like a lot of steps but this can be automated in actions. I do this all the time with product shots that need to fit a standard window. Just another way to go, hope it helps...
Thank you so much. You have no idea how long I have been messing with this!