Re: [Gimp-user] Photos negatives scanned into the gimp
jim feldman wrote: Like others have said, you were probably better off to have done this while scanning using either xsane or vuescan (not open source, but a pretty good scanner prog). I'm surprised whatever s/w you were using didn't give you the option when you told it you were scanning color negs. I have an HP LaserJet 3057, and I just did Acquire in the gimp... but maybe the option was there, I don't remember. I'll try that again, though. I'd like to thank Alex for the link to www.c-f-systems.com, they have a paper there, called Negative to positive, that seems to explain it all. But it is definitely NOT simple ! Thanks all, Joao -- Joao Moreira de Sa Coutinho [EMAIL PROTECTED] ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
Joao Moreira wrote: jim feldman wrote: Like others have said, you were probably better off to have done this while scanning using either xsane or vuescan (not open source, but a pretty good scanner prog). I'm surprised whatever s/w you were using didn't give you the option when you told it you were scanning color negs. I have an HP LaserJet 3057, and I just did Acquire in the gimp... but maybe the option was there, I don't remember. I'll try that again, though. I'd like to thank Alex for the link to www.c-f-systems.com, they have a paper there, called Negative to positive, that seems to explain it all. But it is definitely NOT simple ! Thanks all, Joao Isn't that a multifunction reflective scanner? I didn't know it did transparencies. I believe you were probably using the xsane plugin for the gimp to do the scan. It probably didn't prompt you for film type since it didn't think you would be scanning film on that model. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
Owen wrote: Or do I need to code a plugin, and if so, what exactly is the operation to be done (in terms of RGB) ? Image-Layers-Colors-Invert ? Actually it's not that easy, because the film contains a mask (yellow red), which has to be filtered out. Claus -- Home Page- http://home.arcor.de/ccyrny/[in English] graf-o-matic - http://grafomatic.twoday.net/ [in German] :: django|log :: - http://djangolog.twoday.net/[in German] Djangology - http://home.arcor.de/ccyrny/djangology/ [in German] ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
Claus Cyrny wrote: Owen wrote: Or do I need to code a plugin, and if so, what exactly is the operation to be done (in terms of RGB) ? Image-Layers-Colors-Invert ? Actually it's not that easy, because the film contains a mask (yellow red), which has to be filtered out. Claus And different films have different masks. Kodak is different from Fuji. Like others have said, you were probably better off to have done this while scanning using either xsane or vuescan (not open source, but a pretty good scanner prog). I'm surprised whatever s/w you were using didn't give you the option when you told it you were scanning color negs. jim ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Photos negatives scanned into the gimp
Hi, I just took some photos negatives (memories from the pre-digital days :-) and put them on my flat bed scanner. So now I have a color image of these negatives in the gimp, so how do I go about turning them into a positive ? I would expect this to be a very simple operation, like a subtraction, on each pixel, right ? does this exist ? is there a tool/filter that does this ? Or do I need to code a plugin, and if so, what exactly is the operation to be done (in terms of RGB) ? Thanks, Joao -- Joao Moreira de Sa Coutinho [EMAIL PROTECTED] ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
Hi, unfortunately it is not that easy, because not only have you to invert the colors, but to subtract the brown color from the film strip also. I'm not sure, but my first guess would be that this is not easily done in GIMP. Greetings, lexA Am 17.04.2007 um 22:02 schrieb Joao Moreira: Hi, I just took some photos negatives (memories from the pre-digital days :-) and put them on my flat bed scanner. So now I have a color image of these negatives in the gimp, so how do I go about turning them into a positive ? I would expect this to be a very simple operation, like a subtraction, on each pixel, right ? does this exist ? is there a tool/filter that does this ? Or do I need to code a plugin, and if so, what exactly is the operation to be done (in terms of RGB) ? Thanks, Joao -- Joao Moreira de Sa Coutinho [EMAIL PROTECTED] ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user --- Remember: There are only two tools in life. WD-40, for when something doesn't move, and should, and Duct Tape, for when something is moving and it shouldn't. So does the universe explode if you spray duct tape with WD-40? ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
Hi, On Tue, 2007-04-17 at 22:58 +0200, Axel Wernicke wrote: unfortunately it is not that easy, because not only have you to invert the colors, but to subtract the brown color from the film strip also. I'm not sure, but my first guess would be that this is not easily done in GIMP. It should be easy though to write a plug-in that does this. One just needs to figure out the right values. Perhaps there are ICC color profiles for common brands of negatives that could help with this task? Sven ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
Am 17.04.2007 um 23:16 schrieb Sven Neumann: Hi, On Tue, 2007-04-17 at 22:58 +0200, Axel Wernicke wrote: unfortunately it is not that easy, because not only have you to invert the colors, but to subtract the brown color from the film strip also. I'm not sure, but my first guess would be that this is not easily done in GIMP. It should be easy though to write a plug-in that does this. One just needs to figure out the right values. Perhaps there are ICC color profiles for common brands of negatives that could help with this task? There are some papers, so there is a solution :) http://www.c-f-systems.com/PhotoMathDocs.html Just somebody needed to implement it :) And yes there is a Photoshop Plug-in already. just my 2c lexA Sven --- Remember: There are only two tools in life. WD-40, for when something doesn't move, and should, and Duct Tape, for when something is moving and it shouldn't. So does the universe explode if you spray duct tape with WD-40? ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
On Tue, 17 Apr 2007 22:02:51 +0200 Joao Moreira [EMAIL PROTECTED] wrote: Hi, I just took some photos negatives (memories from the pre-digital days :-) and put them on my flat bed scanner. So now I have a color image of these negatives in the gimp, so how do I go about turning them into a positive ? I would expect this to be a very simple operation, like a subtraction, on each pixel, right ? does this exist ? is there a tool/filter that does this ? Or do I need to code a plugin, and if so, what exactly is the operation to be done (in terms of RGB) ? Image-Layers-Colors-Invert ? Owen ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Photos negatives scanned into the gimp
On Tue, Apr 17, 2007 at 11:16:28PM +0200, Sven Neumann wrote: Hi, On Tue, 2007-04-17 at 22:58 +0200, Axel Wernicke wrote: unfortunately it is not that easy, because not only have you to invert the colors, but to subtract the brown color from the film strip also. I'm not sure, but my first guess would be that this is not easily done in GIMP. It should be easy though to write a plug-in that does this. One just needs to figure out the right values. Perhaps there are ICC color profiles for common brands of negatives that could help with this task? XSane maintains a list of known values. Actually, most scanning software (including XSane) will fix it for you if you tell it you are scanning a negative. -- Hofstadter's Law states: It always takes longer than you expect, even when you take into account Hofstadter's Law. pgpCztPfkRCIB.pgp Description: PGP signature ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
