Episode 163: Colour Curves July 20, 2011

from Meet the GIMP· · · 1 listeners

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 …



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