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

On Sun, Jul 25, 2010 at 11:39 PM, Andrew 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. :)