GIMP SHARPEN IMAGE HOW TO
GIMP SHARPEN IMAGE PATCH

They describe how to do this using the 'Blend If' option associated with Photoshop's Layer Style. One aspect of sharpening to which Fraser and Schewe draw attention is that of blending out highlights and shadows before sharpening, so reducing any increase in artefacts arising from noise. There is now a second edition available in the UK, ISBN 978-5-0, available via Amazon and other online retailers. McQ, Colin Southern and others have produced excellent tutorials and commentaries on various aspects of sharpening and attention has been drawn to the book by Bruce Fraser and Jeff Schewe, 'Image Sharpening with Adobe Photoshop.'. sharpened in Lightroom, at 960ењ†36 pixels.Hi Gimpophiles (and Photoshopians as well) - There have been several posts of late on sharpening, one of the most important of techniques open to digital photographers. As you can see up above, it looks sharp enough even without any sharpening at all! Here's a comparison of unsharpened vs. If you're going to beautifully sharpen your original image at it's original resolution, only to resize it to 800ењ†00 and post it on Facebook or whatever, then all that sharpening was wasted. I've heard it said that you should always sharpen your image at it's final resolution. This brings me to another important consideration. If you look at a 100% crop of the image, you can see that it's not particularly sharp at all. That looks pretty good even without any sharpening! The reason is that the image has been resized to only 20.11% of it's original size. Here is another image with absolutely no sharpening applied.

Most pictures though won't be so obvious, so let's try another one. Now that image was a good candidate for a sharpening tutorial, it was severely cropped from the original, so you're seeing it at nearly 1:1 size. I think I found the settings that work the best for this image to be as follows:ДЄnd here is the final image, sharpened with the settings shown above, then sharpened again, with the amount lowered to. (Unless, of course, you move it too far to the right, then it won't sharpen anything! Only the smooth patches are affected by the Threshold slider. But if you look at the areas with lots of contrast and detail, they look the same.

GIMP SHARPEN IMAGE PATCH

If you look at the upper half of the moon especially, you can see in the large gray patch that there's a lot more noise/grain introduced. If you put the values too high, then nothing will be sharpened, so you've got to experiment a little to find the 'sweet spot'. Unfortunately, GIMP doesn't give you a nice visual representation of the Threshold, so you'll just have to guess on the values. In the case of this picture, the sky definitely doesn't need any sharpening, so I adjusted the Threshold a little. Sharpening them will only increase noise, it will not have any visual sharpening effect. However, most pictures don't need every single bit sharpened think of the sky, or any large areas that are the same color. If it is set to 0, then it attempts to sharpen every single bit of the picture. The threshold is basically the same idea as the 'Masking' slider in Lightroom, it controls which areas of the picture are sharpened. Notice also that the 'Threshold' slider is set to 5. Of course it depends on the picture, but usually the default of 5 is way too big. Notice that the radius is set to 0.4, which seems quite small.

Gimp sharpen image