RAW vs TIF file size

SW
Posted By
Stuart_Wetherbe
Oct 7, 2005
Views
327
Replies
1
Status
Closed
This is a curious question rather than a practical one. Why are original RAW capture file sizes so much smaller than the same file saved as a TIF? Since the RAW capture contains *all* the original info shouldn’t it be larger?

Stu
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Peter_Figen
Oct 7, 2005
Because the raw file is really a one channel grayscale rendition of the scene that is interpolated to three channel RGB through your raw conversion software of choice. Uncompressed raw files are 1/3 the size of uncompressed tiffs from the same file. Some camera manufacturers compress the raw files, some don’t, which accounts for varying sizes of raw files from the same camera.

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