#Gimp sharpen photo full
This way you regain the full control over the sharpening of your images. We strongly recommend you disable this means of sharpening and use GIMP filters instead. You can follow any responses to this entry through the RSS 2.0 feed. Some imaging devices like digital cameras or scanners offer to sharpen the created images for you. This entry was posted on Monday, January 10th, 2011 at 8:00 am and is filed under GIMP, GIMP Basic Series, Howtos, Software. Tags: GIMP, image editor, photo editor, tips Tomorrow, we’ll use GIMP to give portraits a soft focus reminiscent of glamorous celebrity shots. Details in the photo are also lost because the highlights are blown out into pure white while shadows are muted into black.Īgain, don’t oversharpen unless your intent is to deliberately create a painterly special-effects version of the photo (see Picture 6). Pict 6: Pushing the "Radius" and "Amount" up can lead to some nice painterly effects.Īlthough the Unsharp Mask filter avoids accentuating the noise and graininess in the photo, oversharpening will introduce halos around the edges in the photo and make it look unnatural. A high Threshold value protects areas of smooth tonal transition from being sharpened, and minimises the amplification of blemishes in faces, water surfaces or skies. Only adjacent pixels where the difference in pixel values exceeds the Threshold value will be detected as part of an edge to be sharpened. The Threshold slider tells GIMP how it should detect edges. The Amount slider controls the strength of sharpening to apply while the Radius slider specifies how many pixels on either side of an edge will be modified for sharpening. It lightens the lighter pixels on one side of an edge and darkens the darker pixels on the other side, making the photo appear more crisp than it really is. GIMP first detects the edges in the photo and sharpens the photo by increasing the contrast of these edges. There are, however, three sliders, providing finer control over how the photo is sharpened. Similar to the simple Sharpen filter, an “Unsharp Mask” dialog box pops up with a preview thumbnail of the sharpening effect. The name and method used is based on a traditional darkroom technique for sharpening film photos – in which a photo is made to appear sharper by superimposing a blurred copy of the photo over the original photo. The Unsharp Mask filter actually sharpens a photo – contrary to what its name suggests – and is the tool of choice of the pros. "Sharpen Image using Grain Extract Method.Pict 5: The Unsharp Mask filter provides more control over how the sharpening is accomplished. "script-fu-bp-sharpen-grain-extract" script name (set! drawable (car (gimp-image-merge-down theImage layerOverlay 2))) (gimp-image-remove-layer theImage layerGrainExtract) (gimp-layer-set-opacity layerOverlay opacityValue) (gimp-layer-set-mode layerOverlay OVERLAY-MODE) (gimp-image-insert-layer theImage layerOverlay 0 0) (gimp-item-set-name layerOverlay "Overlay Layer") (define layerOverlay (car (gimp-layer-copy drawable 0))) step two - create one more layer, set layer mode to 'overlay' (gimp-layer-set-mode layerGrainExtract GRAIN-EXTRACT-MODE) (plug-in-gauss-rle 1 theImage layerGrainExtract blurValue 1 1) (gimp-image-insert-layer theImage layerGrainExtract 0 0) Click on Filters, also situated along the top toolbar, and locate Enhance from the drop-down menu, selecting the Sharpen effect. By increasing sharpness, you may increase image blemishes and also create noise in graduated color areas. The slider and input boxes allow you to set sharpness (1-99) and you can judge result in preview. (gimp-item-set-name layerGrainExtract "Grain Extract Layer") Scroll bars allow you to move around the image. (define layerGrainExtract (car (gimp-layer-copy drawable 0))) step one - create a new layer, apply gaussian blur and set mode to 'grain extract' (define (script-fu-bp-sharpen-grain-extract theImage drawable blurValue opacityValue deleteGrainExtractLayer mergeLayers) Gimp script-fu to sharpen an image using 'Grain Extract Method' Note: While sharpening an image, it is best to set zoom value to 100% to see the effect of sharpening. Merge ‘vislayer’ with original image layer.Adjust Opacity setting (100.0 by default), to adjust for sharpness.
#Gimp sharpen photo trial
Change Mode to Overlay (? this is my own trial step).Make a copy of this layer using Layers > New from Visible (name this layer as ‘vislayer’).Set ‘Layer Mode’ of ‘duplayer’ to ‘Grain Extract’.Blur the image using Filter > Blur > Gaussian Blur.Duplicate image into new layer (name this layer as ‘duplayer’).Oh!! What is the method? Here are the steps, if you want to try and sharpen an image yourself. Here is the script that I developed for Gimp, to sharpen an image using the ‘Grain Extract’ method.
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