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Use uncompressed TIFs to speed iPhoto
Authored by: bjmorgan on May 15, '03 11:20:40AM

It's a good idea never to have file compression on when working with TIFFs (especially those you plan on having printed or archiving.) As a general rule of compression, it's better to work with uncompressed TIFF files becuase image quality (a.k.a. data) is lost each time you save a compressed image to an uncompressed image and back again (this is especially true when taking your digital images to a professional printer.)

But that's only if you worry about such matters.



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Use uncompressed TIFs to speed iPhoto
Authored by: conundrum on May 15, '03 12:03:04PM

LZW compression is a lossless algorithm. JPEG compression is lossy, as everyone knows. The main reason not to use LZW compression on TIFFs is that imagesetters don't like it.



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Use uncompressed TIFs to speed iPhoto
Authored by: gpl on May 15, '03 12:08:12PM

Tiff compression is generally lossless (LZW, ZIP or CCIT), contrary to JPEG ones. Some TIFFs use JPEG-like compression but I didn't see one yet. So, it's better to check the TIFF files with GraphicConverter, e.g., to test their compression scheme.

JPEG is always lossy.



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Use uncompressed TIFs to speed iPhoto
Authored by: dr_turgeon on May 15, '03 01:26:37PM

I think competent professional printers are able to handle the lossless file compression used on many tiffs...Photoshop certainly does (lzw & zip). And who doesn't have Photoshop who has an imagesetter (no matter how flaky.)



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Use uncompressed TIFs to speed iPhoto
Authored by: bill42 on May 15, '03 03:39:25PM

I love LZW but apparently some RIPs still have problems, or so I've been told. Personally I think jobs are just bounced back by over zealous preflighters.



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