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Artifacts in a CRW file?

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Old 09-23-2005, 04:24 AM
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PatrickB PatrickB is offline
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Join Date: Jul 2004
Location: Munich, Germany
Posts: 301
Doug, If I didn't get you wrong you meant my conversion program took the info from the jpeg rather than the real ras information? But in a 4MB raw for a quite big image (usual 2000 pixels x yada around like that) how tiny would the jpeg be? I'll try to put one online later one!

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Old 09-24-2005, 03:52 AM
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v.bampton v.bampton is offline
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Location: Southampton
Posts: 78
Ok, I had to google this one, as image quality is paramount in our end of the market, and I was concerned that maybe we weren't getting the best from our cameras.

So, for anyone else who's interested, here's what I've come up with...

Canon DO compress their RAW files - but it's not a jpeg compression, it's a proprietary lossless algorithm, so there are not artifacts caused by this compression. (Confirmation of this on Canon's website The only jpeg involved is the tiny thumbnail.

RAW + Jpg is a different setting entirely - and gives 2 files - a normal jpeg, and a normal CRW.

There is nothing you can change in camera to affect the compression on a CRW file.

Hope that helps to clarify it for anyone who's interested. It certainly put my mind at rest.
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