10-17-2016, 02:34 PM
(10-17-2016, 01:25 PM)Panlumix Wrote:(10-17-2016, 08:11 AM)Ofnuts Wrote: Gimp isn't Photoshop, plug-ins for PS don't work out of the box in Gimp. There is a thing called PSPI that lets you use some PS plugins on Gimp (no personal experience, it's for Windows), but for something as frequent as the white balance, there are scripts, the best one IMHO being Luca De Alpharo's whitebalance script.
If you are trying to correct a wrong color temperature setting on you camera, the same person has a colortemp script.
My main aim is to have a white balance reference point,for example to input a color point from a photo taken under the right lighting conditions and use the color picker to adjust this.I have done this with RAW files in Lightzone but with JPEGS I prefer to use Gimp.I am a total novice and still learning the many aspects of Gimp,the auto white balance give the wrong results.
This is exactly how the aforementioned whitebalance script works:
- With the color picker tool (
) you sample a part of the picture that should be gray/white (sheet of paper, shirt, fridge...). Best use the "Sample average option" and sample a significantly large bit ("Radius" slider) to minimize the influence of chroma noise.
- Then use the "Make foreground gray" option of the script.
- It adjusts the colors so that the foreground color becomes neutral gray (R=G=B).
Me, I use the cap of a Nutella jar as a white reference to set the WB manually on my camera
If you use Gimp for photo editing, there are several filters/plugins that you should get asap:
- resynthesize (aka "content aware fill")
- wavelet decomposer.
- GMIC