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I have an irregular shaped picture I'd like to save, in a format which allows the irregular shape to be preserved. Which image formats should I look at, which will support the irregular shape so I don't have to do any manual processing when editing the image?

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What software created the image? – Mike Fitzpatrick Jul 4 '11 at 22:50
    
A custom tool I'm working on. – blueberryfields Jul 4 '11 at 22:51
    
Would a vector format such as SVG be suitable then? – Mike Fitzpatrick Jul 5 '11 at 1:09
up vote 2 down vote accepted

No matter the format, your image will always be rectangular, that is, the usual width X height format.

As above answer, I am assuming you want to preserve transparency, and for that you would need either gif or png format. Png has better quality than .gif and is supported in most if not all mainstream browsers and image applications.

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If you mean an image with a transparent background then the most useful format would be png. This has lossless compression and can support an alpha channel.

Most (if not all) image editing programs support reading and writing png format files.

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I'm looking to preserve image editing information - I want to be able to manipulate the irregular polygon in the image without having to re-define it when I import into editing software – blueberryfields Jul 4 '11 at 22:26

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