Sunday 14 January 2018

post processing - How do I adjust colour casts between photos taken at different times?


I have several photos of similar subjects on the same background.


As they were taken outside at different times, the lighting conditions are different, and so the colours in the photos aren't equivalent. For example, in some photos the grass is much bluer than in others, even though it's the same grass.


I'd like to be able to pick a colour or area of the photos, and say 'This should be the same colour', and have the photos adjusted accordingly. Hopefully, then, the colours of the subjects will be more comparable.



Is this possible? Will it work? What Windows or Linux software (preferably not Photoshop, please!) will do it?



Answer



Both Lightroom, as well as Photoshop Camera RAW have very simple features that allow you to click on something you know to be white in the image, and based on this assumption, will set the white balance for the image. You would then select this same object in the other photos, which will then correct the balance in the other images to ensure that the object is white. For these tools, there is an eyedropper you use.


This is also available in Photoshop Elements, and Paintshop Photo Pro for a bit cheaper price. Also, consider the free Paint.net, for Windows, which has lots of plug ins that can do this as well. If you prefer open-source, then you should download GIMP, which works for both Windows or Linux. However, GIMP is not quite as simple, though if you are using RAW, the UFRAW tool does have a one step eyedropper similar to Photoshop. Otherwise, it can be much more involved. Google "GIMP White Balance" for your choice of tutorial.


[Do yourself a favor and just get Lightroom, you will be glad you did]


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