Select All > Copying only visible portions of layers
Imagine an image that measures 600 X 600 pixels. If you change the canvas size to 600 X 400 pixels, then choose select all, you only copy the portion of the image that's visible. In other words, you will past an image measuring 600 X 400 pixels.
Now imagine a file measuring 600 X 600 pixels that contains several layers. However, one particular image measures 700 X 800 pixels. If you choose Select All > Copy, the new file you create will measure 700 X 800 pixels.
I want to select and copy all layers, but I only want to copy the visible portions. So when I create a new file, it will measure 600 X 600 pixels. I guess another way of saying it is that I would like to clip the images, deleting all portions that aren't visible.
Thanks.