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Re: filmscanners: Re: Scanning problems
In a message dated 2/6/2001 12:35:17 PM EST, bdbuck@bellatlantic.net writes:
> Has anyone else noticed that Photoshop
> 5.5's compression of 48-bit LZW TIFFs actually makes the file bigger than
> the uncompressed version?
There's a common mistake when compressing tiff files. You need
to use a "predictor", and I suspect they didn't.
> One interesting thing to note is that Vuescan's 48-bit LZW TIFFs are
smaller
> than the uncompressed version, so this isn't something inherent to 48-bit
> files, just Adobe's way of saving them.
Yes, I set TIFFTAG_PREDICTOR to 2. Adobe must have forgotten
to do this.
Regards,
Ed Hamrick
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