Re: filmscanners: VueScan 6.3.19 Available
I've been following this list for many months, but this is my first message. In a recent message about Vuescan 6.3.19 Ed Hamrick wrote: VueScan uses an entirely different (and I think better) approach to using the infrared channel to remove the dust spots. It doesn't result in any color shift, it works with Kodachrome, and it doesn't apply a softening filter in areas where there's no dust spot. It sounds like from this description of Vuescan's cleaning algorithm with scanners that have an infrared channel that there is no disadvantage at all in always using the Clean filter since there will be no degradation of a clean image and only a bit of softening in the area of a defect in a non-clean image. Is that true? Further, is it also true that there is no real disadvantage to always using the strongest filter -- Scour -- instead of the weakest filter -- Clean? Regards, Henry Richardson http://www.bigfoot.com/~hrich _ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com
RE: filmscanners: VueScan 6.3.19 Available
-Original Message- From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]] Sent: Tuesday, December 12, 2000 8:19 AM To: [EMAIL PROTECTED] Subject: Re: filmscanners: VueScan 6.3.19 Available In a message dated 12/11/2000 8:19:34 PM EST, [EMAIL PROTECTED] writes: Now I'm confused (not hard to do). Please explain to me "where" ICE is.is it software or hardware? Or a combination of both to get that capability? ICE is the marketing name for a dust removal technique invented by Albert D. Edgar while he was working at IBM (he's at Applied Science Fiction now). The patent can be read at: http://www.delphion.com/details?pn10=US05266805 It's U.S. Patent 5,266,805 This patent only describes the way the infrared channel is used to correct the image, but it has several problems. The first problem is that it assumes the infrared channel doesn't show any image data, but in reality the infrared channel isn't flat (especially for Kodachrome). The second problem is that the infrared and color channels aren't perfectly aligned, which causes the edges of dust spots to not disappear when the algorithm in this patent is used. VueScan uses an entirely different (and I think better) approach to using the infrared channel to remove the dust spots. It doesn't result in any color shift, it works with Kodachrome, and it doesn't apply a softening filter in areas where there's no dust spot. Regards, Ed Hamrick [Oostrom, Jerry] A ha, so Vuescan cleaning still uses the infrared channel. Perhaps you remember from the thousands of mails received this year that some person (I) once sent you a request for a cleaning algorithm that probably does not exist yet. I thought this up myself, but perhaps a lot of others did too and were just knowledegable enough to know it was asking for the impossible or could never work. Now I think I should propose it to this group and receive answers from them why it is not feasible. (Keep in mind that I am not good at math and such). What I noticed with dust on slides in a neutral scan is that most of the dust is real pitch black. With negatives it is black in the raw scan, but has a color shift related to the white point chosen in the positive crop file. Many times however, it will be at the boundary of the histogram. Can an algorithm be constructed that applies selective softening/cleaning at parts that are at the lower boundary of the histogram for a slide and at the upper boundary of the histogram of a negative? Has it already been made (does the clean filter in the newest Vuescan already work as such)? Did I ruin any surprise for a new cleaning algorithm in vuescan that can be used for the wicked scanwit and any other scanner without ICE? Please tell me if this idea is any good to investigate and build upon, thanks, Jerry.
Re: filmscanners: VueScan 6.3.19 Available
It's accomplished through the use of a clever s/w algorithm which makes use of a forth channel in the IR. The best place to look for details is on the ICE developer's web site, www.asf.com. Phil Daryl G. Jurbala wrote: Now I'm confused (not hard to do). Please explain to me "where" ICE is.is it software or hardware? Or a combination of both to get that capability? Thanks, Daryl -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Monday, December 11, 2000 5:08 PM To: [EMAIL PROTECTED] Subject: Re: filmscanners: VueScan 6.3.19 Available Interestingly, the cleaning algorithm in VueScan (which is completely different than ICE) doesn't soften the image at all, except in the area around actual dust spots. The ICE algorithm softens the image throughout when used.
Re: filmscanners: VueScan 6.3.19 Available
Hi Ed, I downloaded 6.3.19 to try as a demo. I can't get it to work with my Umax Powerlook 3000. Does the driver support this scanner? If so, I will try again and send you details of the problem. Thanks, Jim Klebau [EMAIL PROTECTED] wrote: I just released VueScan 6.3.19 for Windows, Mac OS and Linux. It can be downloaded from: http://www.hamrick.com/vsm.html What's new in version 6.3.19 * Significantly improved image cleaning on scanners with an infrared channel (Scan Elite, LS-30/LS-2000) * Separated filter option into clean and sharpen options * Fixed small problem with blue channel calibration on some Minolta Scan Speed and Scan Elite scanners
Re: filmscanners: VueScan 6.3.19 Available
In a message dated 12/11/2000 12:34:38 PM EST, [EMAIL PROTECTED] writes: Imagine being able to select only certain regions where dust is noticeable, and apply your filter plugin selectively(?!) Is it possible to work with an RGBI image in Photoshop? If not, Ed's algorithm or ICE as a plugin would be crippled. Rob Rob Geraghty [EMAIL PROTECTED] http://wordweb.com
RE: filmscanners: VueScan 6.3.19 Available
Daryl wrote: Now I'm confused (not hard to do). Please explain to me "where" ICE is.is it software or hardware? Or a combination of both to get that capability? A combination is needed to get the capability. "ICE" per se is a piece of software written by a 3rd party company, licensed to a number of scanner makers - eg. Nikon, Acer and Minolta that I'm aware of. In order for ICE to work, it needs a fourth channel from the scanner - an Infra-Red channel (IR). The reason for this is dust and scratches are very obvious in IR, which allows the software to "see" where they are. The software then uses various clever algorithms to resonstruct the missing piece of the image using the surrounding pixels and eliminate the dust or scratch in the process. So only scanners with an IR channel can use ICE. As far as I know, Vuescan *can* remove some dust and scratches without an IR channel but it works much better *with* an IR channel. There's other software which attempts to remove dust and scratches - I think Polaroid's Insight has such a filter, and I think there's one in PS5 (or later) as well. Rob Rob Geraghty [EMAIL PROTECTED] http://wordweb.com
