Method to get image type? about image_voodoo HOT 5 CLOSED

I think this seems reasonable to me. We just need to be able to retrieve this from the backed data.

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http://www.silverbaytech.com/2014/05/29/iiometadata-tutorial-part-2-retrieving-image-metadata/

Supporting this might be a significant amount of work, but definitely worth doing if we expand the concept to get useful info like bits per pixel and format info like RGB, RGBA, CMYK, etc...

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Looks like fastest way to obtain format name a.k.a. image file type is to use ImageReader type, like here: http://www.java2s.com/Code/JavaAPI/javax.imageio/ImageIOgetImageReadersObjectinput.htm

I need it in my project so I will implement it in my fork. Also doing it in GAE looks quite easy, because it have it by default: https://developers.google.com/appengine/docs/java/javadoc/com/google/appengine/api/images/Image#getFormat()

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You @enebo can see my implementation in PR #7. Please merge it.

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Gave this issue it's own release....numbers are infinite! in 0.8.5. Thanks for the implementation @RaVbaker!

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