Having discussed the issues of colour creeping into your Infra-red shots, in my last Blog, I thought I ought to touch on the subject of Channel Swapping. This technique works better with images shot with a 720nm filter, simply because it lets in a fair amount of normal light.
After selecting your White Balance point your image will still normally exhibit a slight orange/reddish cast to the sky area with your foliage showing signs of a minor cyan/blue tinge. This is perfectly normal for this type of filter; some photographers prefer their images this way.
By swapping the Red Colour Channel for the Blue and the Blue Colour Channel for the Red we end up with a totally different looking image, more akin to a frosty winter scene than a psychedelic sunset! For the Infra-red photographer using Photoshop™ as their preferred image editor here are the instructions for swapping channels.
With Photoshop™ running and your chosen image open select Image> Adjustments> Channel Mixer. This will open the Channel Mixer, the default setting should read, Red 100%, Green 0%, Blue 0%. Change the Red Source Channel to 0%, Green 0% and Blue to 100%.
Without leaving the Channel Mixer dialogue box change the Output Channel to Blue and set the Red source channel to Red 100%, Green 0% and Blue 0%. Click the OK box when done.
Use the Infra-red Archive to discover more about the world of Infra-red Photography
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