Duncan,
the original poster mentioned that he wanted his canvas to be the exact size of his image and that his image was not square or rectangular, so well i may be wrong here, but I've never seen a canvas in PS that wasn't square or rectangular.
O.K. - i understand. Maybe the OP is unaware that having a canvas that is not rectangular is impossible! Gonna be difficult with only height and width input boxes!
But maybe they are really asking another question - like how can they remove the null space around an irregular shaped picture - i.e. a cutout
Hopefully they will post again and decribe their situation a little bit more, I'm thinking they are wanting to know about preserving the transparant area around an image (maybe for web?)
Depends on how you are going to use it. If you wanted to add the picture to another image in photoshop, you can select the white space around the image with the wand tool and delete the white. When you copy that layer over another layer, the background will show throught.
When the white has been removed you can save it to a format that supports a tranparency,such as gif or png, that way you can open that image in another program (or add it to a webpage, for example) and the transparency information will be retained.
Let me know if that makes sense to you, if not maybe post what you are trying to achieve and someone can give more specific pointers.
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