Exploring the most Picturesque & Historic parts of England
Joined: 21st Nov 2004
quotePosted at 01:36 on 6th April 2008
For Photoshop users ( and possibly others? ) I've found a more sublte way to alter image contrast is to use the Unsharpmask filter. After-- Filter>Sharpen>Unsharpmask set the Amount to around 15% ( not critical); Threshold to 0, then use the Radius slider ( pixels) to now adjust the contrast, say 100 Pixels to kick off with, then alter to suit your image. Seems to be a finer controlled way of altering the Contrast than the usual Contrast adjustment provided.
Joined: 14th Jul 2008
quotePosted at 16:55 on 27th August 2008
Nice tip Paul. Thanks a lot. I'd never even thought of doing it that way.
Joined: 14th Apr 2008
quotePosted at 15:20 on 26th October 2008
Great advice. I think for people who are a bit unsure about using photo software, they should just give it a go and in no time at all you'll getting much improved pictures - go on, give it go.
Joined: 29th Dec 2008
quotePosted at 17:00 on 10th April 2010
There's a tutorial here for LCE (Local Contrast Enhancement) ;)
Joined: 22nd Dec 2005
quotePosted at 09:18 on 30th July 2013
I agree that the unsharp mask can improve apparent contrast, and is particularly useful for enhancing contrast in architectural details, but needs to be used sparingly. I do not have Photoshop, but use Canon Digital Photo Professional, which also has an unsharp mask control. I assume the following comments will apply to any software with an unsharp mask tool.
As I understand it, the threshold slider controls the digital level differences from pixel to pixel at which the mask effect kicks in. Setting the threshold to zero therefore applies the effect at all digital level differences from zero upwards.
Having looked at a few shots I have taken, I can see that setting the threshold to zero causes unpleasant artefacts on smoother textures such as foliage and skin. Therefore I generally set the threshold to about half way, unless the shot is so poor it needs savage sharpening.
Edited by: Edward Lever at:30th July 2013 09:30
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