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Re: filmscanners: File format
Maris said:
> Just a note on LZW compressed image portability - I have
run into one
> instance where an LZW compressed image was not portable -
when exporting a
> 48-bit compressed TIFF from Vuescan to Corel PhotoPaint 9
it opens but the
> image is unrecognizable. If exported uncompressed there
is no problem,
Alan T says:
This may be the same problem we discussed in February. Here
is an extract from that discussion.........
Alan T:
> >PSP7 will not read the compressed 48-bit tif files from
> >Vuescan, saying "a predictor of 2 is only supported on
LZW
> >compression for 8 and 24 bit images." It's fine for
24-bit
> >Vuescan compressed or uncompressed tifs.
Rob:
> Ah, yes. I think PSP may also read a 48bit uncompressed
> file? I'll have to try it. I'll try raising the issue
> with JASC.
Alan T: Yes it does (see my message of 13:33 GMT 6Feb).
Ed has now explained why PSP can't read his compressed
48-bit ones as opposed to Adobe's allegedly compressed but
larger files.
Ed Hamrick:
>Yes, I set TIFFTAG_PREDICTOR to 2. Adobe must have
>forgotten to do this.
----- Original Message -----
From: Rob Geraghty <harper@wordweb.com>
To: <filmscanners@halftone.co.uk>
Sent: Tuesday, February 06, 2001 11:29 PM
Subject: PSP and 48 bit was Re: filmscanners: Re: Scanning
problems
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