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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 
>  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.

Ed Hamrick


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