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Blog: Darkroom Tutorials

January 5, 2014

Advanced sharpening techniques #3 ; Luminance Sharpening

Sharpening often produces unwanted colour shifts or artefacts, neither of which are desirable in a final print. Through a technique called luminance sharpening, these unwanted results of image sharpening can be avoided by targeting only luminance data.

A luminance sharpen will only apply itself to the black and white information in an image -- the detail; otherwise known as luminance. As a by product, there’s zero impact on colour; which reduces artifacts…

December 5, 2013

Advanced sharpening techniques #2 ; High Pass Filter

Photoshop’s sharpening options are varied and powerful, but some more powerful than others, and one tool whose simplicity belies it's power is the High Pass filter, oft overlooked in favour of more traditional techniques like the Unsharp Mask.

The High Pass technique is both highly effective, non-destructive and much simpler to use than the feature rich sharpening filters like the USM filter, so I'm not sure why it goes overlooked,…

June 15, 2013

Advanced sharpening techniques #1 ; Selective sharpening

Advanced sharpening techniques #1 ; Selective sharpening

All Photoshops' sharpening options have 1 common weakness, they apply 1 sharpening value equally across an entire image.

This can force you to make frustrating tradeoffs to find that 'honey-pot setting'; the sharpening value that allows you to achieve enough crispness for key focal points, without compromising other areas by introducung distracting artefacting or halos.

Through the selective sharpening or compositional…

March 5, 2013

Cloning with colour

Photoshop has many options when it comes to removing or repairing iimage detail. The clone stamp and healing brush all allow us to copy or repair pixels, covering or matching areas as we need. However, they are only effective tools when they have source detail to clone from, and both have the potential to alter image texture, creating 'smooth' patches. So in a image where you want to preserve texture and clone with minimal source…

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