A commercial package called DxO Optics Pro v5 has an interesting twist on de-noising: it does de-noise of raw images before de-mosaic. An elegant idea really, as de-mosaic can't help but diffuse the noise across more pixels and thus make de-noising harder / less accurate.
This approach would certainly suggest separating de-noise and sharpen. Though I believe there are some other tools which deliberately integrate the two in order to better coordinate their processing. But I don't know what the nature or benefit of that coupling is. regards, Eric -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Martin Egger Sent: Tuesday, December 11, 2007 11:25 AM To: [email protected] Subject: Re: [Rawstudio-dev] Sharpen take 1 >> - Color noise is sharpened too much with a sharpening setting of 3+ for ISO100 or 2+ for ISO1600. Maybe some more selectable parameters are needed here (like radius and threshold in USM)? Or include some logic with modifies such parameters based on the ISO? >> > We need to find the magic way to do this. I'm looking at some > denoising to be run before sharpening, maybe this will help. Any ideas > are welcome :) I think, denoising and sharpening should be independent of each other and user-selectable, so denoising an image by default when sharpen it, might not be the best idea? Using standard USM parameters might be more transparent to the user. Or have a table with different USM parameters for different ISO settings within the program logic - but I don't know if you did implement USM code. Martin _______________________________________________ Rawstudio-dev mailing list [email protected] http://rawstudio.org/cgi-bin/mailman/listinfo/rawstudio-dev _______________________________________________ Rawstudio-dev mailing list [email protected] http://rawstudio.org/cgi-bin/mailman/listinfo/rawstudio-dev
