filmscanners: Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
Alan wrote: JASC hasn't taken compression/decompression of 48-bit images seriously because PSP can't work with them. If you do load a 48-bit image you can only save it as 24-bit. Oh, sure. I was just pointing out that ACDSee wasn't the only program which had problems with the Vuescan compressed TIFFs as an FYI for people who want to use Vuescan and PSP. The solutions are simple - drop the output to 24bit or switch compression off. For 'serious' users (which doesn't include me) this is a bad drawback, and means you're stuck with Photoshop or similar. I think the shareware program Picture Window Pro works in 48 bit colour. As a *viewer*, Ed Hamrick's *Vueprint* is pretty well unbeatable, and it's included in the Vuescan licence. Irfanview is a neat little picture viewer as well. Very small and fast but it defaults to opening a file at 1:1 which is a bit of a pain. I think you can change the setting though. Maybe those viewers that don't read Ed's compressed 48-bit files have just lifted a compression/decompression routine from someone else, without understanding it very well. Could be. In the case of PSP I think it's likely to be the earlier guess that they weren't serious about supporting 48bit files in a 24bit editor. Rob Rob Geraghty [EMAIL PROTECTED] http://wordweb.com
Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
One of the things that amazes me about Ed's work is that, technically speaking, it is Vuescan that's included in the Vueprint license. Pat --- Alan Tyson [EMAIL PROTECTED] wrote: As a *viewer*, Ed Hamrick's *Vueprint* is pretty well unbeatable, and it's included in the Vuescan licence. __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com
Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
In a message dated 9/4/2001 6:16:48 AM EST, [EMAIL PROTECTED] writes: VueScan uses a predictor of 2 - 7 isn't a valid predictor. All 2 means is to take the difference between adjacent pixel values before compressing. I don't understand. If a predictor of 2 is invalid why would you use it? A predictor of 7 is invalid. A predictor of 2 is valid. This isn't rocket science. Regards, Ed Hamrick
Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
Ed wrote: VueScan uses a predictor of 2 - 7 isn't a valid predictor. All 2 means is to take the difference between adjacent pixel values before compressing. I don't understand. If a predictor of 2 is invalid why would you use it? A predictor of 7 is invalid. A predictor of 2 is valid. Ah. It appeared you had written a predictor of 2 to 7 isn't a valid predictor. The use of the hyphen was confusing. This isn't rocket science. Was the extra comment really needed? Rob
Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
JASC hasn't taken compression/decompression of 48-bit images seriously because PSP can't work with them. If you do load a 48-bit image you can only save it as 24-bit. For 'serious' users (which doesn't include me) this is a bad drawback, and means you're stuck with Photoshop or similar. I used to use PSP5 as a viewer from within Vuescan, but it's not necessary any more because (a) Ed put a good viewer in Vuescan, due to popular demand, and (b) PSP7 loads much more slowly than PSP5 on my antique (2-yr old) 400MHz Pentium II, meaning it's an excellent 24-bit editor, but a useless viewer. As a *viewer*, Ed Hamrick's *Vueprint* is pretty well unbeatable, and it's included in the Vuescan licence. ISTR (seem to recall) that you'll find Photoshop's compressed tif files may be readable in other programs, but they're sometimes bigger than the uncompressed ones, so they load more slowly, anyway. If you trawl the archives for this list you'll find we last discussed these issues in February 2001, I think, in the context of a long argument about jpegs vs tifs. Maybe those viewers that don't read Ed's compressed 48-bit files have just lifted a compression/decompression routine from someone else, without understanding it very well. Regards, Alan T - Original Message - From: Rob Geraghty [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, September 04, 2001 11:46 AM Subject: Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem Ed wrote: VueScan uses a predictor of 2 - 7 isn't a valid predictor. All 2 means is to take the difference between adjacent pixel values before compressing. I don't understand. If a predictor of 2 is invalid why would you use it? The error I get from PSP is A predictor of 2 is only supported for LZW compression on 8 and 24 bit images. Obviously it's a 48bit LZW TIFF from Vuescan which causes this error. An uncompressed TIFF opens fine. Rob
Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
In a message dated 9/2/2001 7:17:58 PM EST, [EMAIL PROTECTED] writes: I don't know if the compression settings have changed. Only Ed can answer that one. PSP gives an error I think about not being able to use a predictor of 7 with 48bit depth. VueScan uses a predictor of 2 - 7 isn't a valid predictor. All 2 means is to take the difference between adjacent pixel values before compressing. Regards, Ed Hamrick
filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
Larry wrote: This is the first time the default settings wouldn't open in ACDSee. But then I haven't used VueScan in about two months or so. I don't know if the compression settings have changed. Only Ed can answer that one. PSP gives an error I think about not being able to use a predictor of 7 with 48bit depth. PSP opens the files without a problem if compression is switched off, or if they are 24 bit. Maybe I'm not understanding it completely. Why is compression a default setting for a scan? Because most people have limited disk space? The settings Ed has used compress the images better than any other programs I've tried with LZW TIFF compression. But precisely because the settings are unusual, some programs can't open the files. Most scanner owners have Photoshop, so I guess that's what Ed is banking on. If I didn't own Photoshop, I would probably be using either PSP or PhotoImpact. If the files generated by VueScan didn't open in either graphics program I would be unable to use VueScan. But you can turn the compression off. :) I'm glad you can, because I rely on Vuescan to get decent scans out of my LS30. If it wasn't for Vuescan I would have had to sell the scanner ages ago because of the problem with jaggies. Rob Rob Geraghty [EMAIL PROTECTED] http://wordweb.com
Re: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem
Another reason why ACDSee doesn't deal with 48 bit files, where PSPro and others do is that 48 bit TIFF is a format used for image editing, not strictly viewing, which is what ACDSee is designed for. That's just my guess, anyway. Pat - Original Message - From: Rob Geraghty [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, September 02, 2001 5:14 PM Subject: filmscanners: Re: filmscanners: RE: filmscanners: VueScan Problem Larry wrote: This is the first time the default settings wouldn't open in ACDSee. But then I haven't used VueScan in about two months or so. I don't know if the compression settings have changed. Only Ed can answer that one. PSP gives an error I think about not being able to use a predictor of 7 with 48bit depth. PSP opens the files without a problem if compression is switched off, or if they are 24 bit. Maybe I'm not understanding it completely. Why is compression a default setting for a scan? Because most people have limited disk space? The settings Ed has used compress the images better than any other programs I've tried with LZW TIFF compression. But precisely because the settings are unusual, some programs can't open the files. Most scanner owners have Photoshop, so I guess that's what Ed is banking on. If I didn't own Photoshop, I would probably be using either PSP or PhotoImpact. If the files generated by VueScan didn't open in either graphics program I would be unable to use VueScan. But you can turn the compression off. :) I'm glad you can, because I rely on Vuescan to get decent scans out of my LS30. If it wasn't for Vuescan I would have had to sell the scanner ages ago because of the problem with jaggies. Rob Rob Geraghty [EMAIL PROTECTED] http://wordweb.com _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com
