Every time you have a bright light shining into your lens you get a lens flare. This can look nice or horrible. You can avoid much of it with a lens hood – and with paying more money for better coated lenses.
My preferred way to tackle a problem is to understand the source of it. Solving the problem is often much easier then. (This is the theory, often I just poke around…..;-) ) So I start with a bit of blackboard – showing that a lens flare is only added light, the original image lies below and the flare can be (in theory) subtracted from it.
In GIMP I do this with comparing similar colours in and outside of the flare. A bit of layer magic and the flare is gone. Except for the fringe where my patience ran out.
00:20 Greetings, Flattr
01:45 Lens flares
02:20 Origin of lens flares
12:10 Avoid lens flare with a lens hood and lens coating
13:05 “Digital” lenses
14:20 Solution: subtract light
16:00 Curves to correct the contrast
19:45 Subtracting light from the flare
19:45 How much light was added in the flare?
22:00 Sample points
23:05 Docking a dialogue
23:30 Mixing the correction colour
27:25 Correcting the second flare
35:15 A quick crop
36:30 Why layers?
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