compressing digital pictures - Nature Photography Forum

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Q. compressing digital pictures

Asked by Alicia Good (K=0) on 4/27/2004

what is the best way to compress pics that are done with a 3.1 kodak camera digital

Jeroen Wenting

(K=25317) - Comment Date 5/20/2004

Digital image formats come in 2 flavours:
compressed and uncompressed.
Compressed formats usually don't compress well because they're compressed already (logical, right?).
Uncompressed formats can be compressed with any compression software like Winzip or the built-in compression of Windows XP.
You can also convert uncompressed files to compressed format image files using for example Photoshop or Paintshop Pro.

Your camera most likely output JPEG format files. Those are compressed already.
I'd advise against increasing JPEG compression on them as that will cause loss of data which is impossible to undo.

Better exchange that CD burner for a DVD burner :)

Bob Jarman (K=3145) - Comment Date 6/3/2004

Are you referring to file compression for storage purposes or image downsizing for web display?

JT answered regarding the file compression issue, but in answer to downsizing a file for the web, I use Adobe Photoshop CS with the image/size buttons to downsize the image to the pixel dimensions I want, than simply save for web which will convert your image to the correct color space and let you choose the file size you want in the quality option.

Most photo editors are pretty good at downsizing for web display without damaging your image, since they are simply throwing away excess pixels. It is when you want to get bigger that the programs have problems, as they have to create data that wasn't there.

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