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According to Major A <[email protected]>: >=20 > > -from negative film, color is really weird. This is the positive > > image, but they really don't match. I selected "Kodak negative" as > > media type. >=20 > Colour negatives need special treatment in software to eliminate the > orange mask. I don't know what xsane does in this area, but I guess it > cannot be perfect simply because the algorithm should ideally be > applied to the unprocessed data from the CCD rather than the one > processed through gamma tables etc. The resulting image (postive) has an orange color color cast. It should not because the negative of orange is not orange.... > > -from black and white negative, picture is really dark, and really > > grainy, and no that is not the film grain. I selected "Slide" and told > > to invert after scanning, because I don't have B&W negative type. >=20 > I think you will find satisfactory results if you play around with the > exposure and gamma options a bit. I used auto exposure and automatic gamma. > > -from slide film, I still get grainy pictures (even though I'm > > scanning Provia or Velvia slide, both really common and one of the > > most fine grained films). I selected "Slide" as media type. >=20 > Is this really grain or just noise? In the latter case, try increasing > exposure, which will improve signal-to-noise ratio. Noise. I thought that auto-exposure would give me the right settings. > > In the three cases, the contrast is excessive. This is even more > > visible on slides taken by real sunny day. >=20 > What gamma settings are you using? Automatic. >=20 > > Is it a known issue ? If yes, what can I do to help resolve the > > problems ? I can do whatever you want including debugging, coding and > > taking pictures :-)) >=20 > Have you tried VueScan on the same pictures? If you manage to get good > scans from it, then it is a software problem. I can't because I'm on Linux PPC (VueScan only works on Intel Linux) and I can't plug the scanner to my PowerBook that runs MacOS X before I get this USB<->SCSI adapter.... > On the other hand, coolscan2 currently allows you to set all relevant > scanner options, and with 10bit output you can get exactly the same > information as VueScan would give you. Therefore this all seems to be > a setting and/or postprocessing issue rather than a problem with the > backend. >=20 > > I'd really like to use my coolscan with SANE. >=20 > One last question: did you use coolscan or coolscan2? I used mostly coolscan2. Thanks for the tips. Hub --Kj7319i9nmIyA2yE Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE82OiIX+4F5qVuFaMRArzFAKDsd/T8QAK3z+QlvOHPZzjO+BcqqQCgogO5 q+/RHPomNg2RngOgxyt77QM= =fDMJ -----END PGP SIGNATURE----- --Kj7319i9nmIyA2yE--
