Re: [Gimp-user] Increasing pixel size
On Sunday 25 July 2010 03:49:47 Byram wrote: I have an old 7 mp image that I'm trying to increase to around 10MP. I've read it's best to increase by 10%, then unsharpen, and repeat process until you get to the desired result. I unsharpened with radius at 5, threshold 15, and amount .5. I don't remember such a recommendation, but a radius of 5 seems rather large to me because the scaling effects should be on the order of 1-2 pixels only, right? When I finished the process. I viewed the image at 100% and it was terrible. Any recommendations regarding the process or the unsharpened mask settings? First another question: How satisfied are you with the upscaling result in one single step (you can try out several scaling algorithms, of course)? If you think it's ok, it may not be necessary to do more complicated procedures. And how plausible does the 10MP image have to be on the pixel scale? Finally, if you have the CPU power and necessary memory available, you could also try out the Smart Enlarge script from the resynthesizer plugin package. But be sure to try it out on a small region first, it would be a shame if you waited for hours for a result that doesn't look like you want it :) Daniel signature.asc Description: This is a digitally signed message part. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Increasing pixel size
On 07/25/2010 03:49 AM, Byram wrote: I have an old 7 mp image that I'm trying to increase to around 10MP. I've read it's best to increase by 10%, then unsharpen, and repeat process until you get to the desired result. I unsharpened with radius at 5, threshold 15, and amount .5. When I finished the process. I viewed the image at 100% and it was terrible. Any recommendations regarding the process or the unsharpened mask settings? Thanks. It makes a difference what type of image it is. Enlarging a jpg will give worse results than enlarging a tif or raw, for example. Try decomposing the img into LAB and sharpening only the L layer. HTH Andrew ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Increasing pixel size
On Sun, Jul 25, 2010 at 11:39 PM, Andrew and...@alangdondavies.es wrote: On 07/25/2010 03:49 AM, Byram wrote: I have an old 7 mp image that I'm trying to increase to around 10MP. I've read it's best to increase by 10%, then unsharpen, and repeat process until you get to the desired result. I unsharpened with radius at 5, threshold 15, and amount .5. When I finished the process. I viewed the image at 100% and it was terrible. Any recommendations regarding the process or the unsharpened mask settings? Thanks. I have tried Resynthesizer 'smart enlarge' and found it lacking. GMIC 'smart resize' is much, much better.. I am VERY happy with it. (smart resize is found in Enhancement subsection in GMIC plugin) Just work out the percentage difference between the old size and new size (in this case i suspect 3648 / 3056 == 119%.. or ) and input that in the width and height fields (including the % sign) I recommend anisotropy 1.0. Smoothing should be = the scaling ratio (so, = 1.19 in this example). Sharpness is something you will just need to experiment with to get the kind of results you want: 12 is a good starting point IMO) Note that it is fairly slow for large images, so try it on a small crop first. :) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Increasing pixel size
I have an old 7 mp image that I'm trying to increase to around 10MP. I've read it's best to increase by 10%, then unsharpen, and repeat process until you get to the desired result. I unsharpened with radius at 5, threshold 15, and amount .5. When I finished the process. I viewed the image at 100% and it was terrible. Any recommendations regarding the process or the unsharpened mask settings? Thanks. -- Byram (via www.gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
