Episode 163: Colour Curves

Years ago I bought a used Peleng Fisheye and never used it much. So I took it for a walk and shot some scenes here in Berlin. At the top is an image of the famous TV tower at the Alexanderplatz.

After a bit of ramblings about Fisheye lenses I process a shot from a hall in the subway station below the Alexanderplatz. There I use the curve tool to get the colours "right". Not "right" as in "true to reality" but as in "the right atmosphere". Tweaking the red, green and blue colour channels can change an image quite a lot.

Never stack curve operations - do it in one step. A little experiment shows the result of not following that advice. A nice recall feature in the curves dialog allows it to reload the last curves. In case of an error just Undo and tweak your curve.

I am absolutely not sure how to sharpen the image. Help me in the forum!

The TOC

00:30 Peleng Fisheye Lens
05:00 Image loaded in GIMP
05:10 Rotating and cropping
06:15 GIMP 2.7.3 remebers the window settings!
06:30 Rotate tool in corrective mode
07:42 Inside out crop
09:20 Copy the layer for backup
09:30 Contrast correction with the curves tool
10:20 A click to early
10:30 Curve operations are stored - easily redone
10:50 RGB colour channels
11:00 Reducing a red colour cast
12:00 Undo changes - not with "Reset"
12:20 Change blue and green in the shadows
14:00 Experiment: One curve operation vs. a series of
16:00 Sharpening the image
17:00 Saving the image
17:30 The Meet the GIMP Forum
18:50 The End