Archive for April 13th, 2010

Apr 13, 2010

Removing sensor marks in Photoshop CS5

Divide-before-low divide-after-low

Photoshop CS5 was announced this week and we have seen a wealth of new features for photographers, more so than any other version of Photoshop I can think of. By now you may already have had a chance to see some of the star new features in action such as Content-Aware filling, Puppet Warp and the new Merge to HDR Pro. Tucked away in Photoshop CS5 are a bunch of other smaller features, which nevertheless can be put to good use. In this article I wanted to focus on the new Divide blend mode. It took me a while to work out what it could be useful for, until Chris Cox who helped point me in the right direction by explaining that it could be useful for carrying out what is usually referred to as a ‘flat field calibration’. In other words, you could use the Divide blend mode to remove lens vignetting and stubborn sensor spots.