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Meet the GIMP! – E006: Selective sharpening

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http://youtu.be/GVLu3TSKFKY

Every digital image needs sharpening. But sharpening increases the noise in the image. In this episode I show a way to sharpen only the areas that need to be sharpened — the edges between different colours or levels of brightness. All the other parts of the image are left alone and so the noise stays down.

Sharpening should always be the very last thing you do with your image.

Chris Marquard explained sharpening in Photoshop Corner No. 4 in his Tips from the Top Floor podcast.

I got the described method from the Gimp tutorial page.

Wikipedia describes the underlying process in this article about the unsharp mask. The links at the bottom of the page are very informative.

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Meet the GIMP! – E005: A Ship in the Fog (Part 3) – Off to the print shop!

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http://youtu.be/8ov5aNr6mwg

In this episode I’ll finish the editing of the image that kept me busy in the last shows. There was a lot to do — darkening the ship with a selective layer mask, cloning out some driftwood and half a bird, correcting the aspect ratio to something the printer will be happy with and giving him a hint how to print the image with a gray and colour gradient.

Before I really send the image to the printer I’ll make the birds in the top left corner a bit darker — but you know how to do that.

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Meet the GIMP! – E004: A Ship in the Fog (Part 2) – Correcting Colours

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http://youtu.be/nc2DZ1MtbYY

In this episode of my video podcast I show how to correct colours with layers in GIMP.

For reducing the green tint of the image I add a layer filled with a bright magenta (white minus a bit green) and set the layer mode to “multiply”. This reduces the green in the image proportional to the amount of green in each pixel. The amount of the effect can be adjusted by changing the opacity of the layer or changing the colour of the layer.

Then I add a bit of blue with a layer filled with a very dark blue (black plus a bit blue) and set the layer mode to “screen”. Now the blue in each pixel is enhanced proportionally. This can also be adjusted.

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