Rokkor 200mm f3.5

parabellumfoto · Joined: 06 Apr 2013 Posts: 413 Location: Sydney, Australia

Looks tiny compared to the image size.
I agree it looks tiny when compared to total image size but if your making large prints it would be a worry.

philslizzy · Joined: 07 Aug 2012 Posts: 4749 Location: Cheshire, England

Dennis · Joined: 28 May 2013 Posts: 5 Location: Germany

Use the "Lens Correction" function in the "Filter" menu, it features three sliders in the "Chromatic Aberrations" tab.

philslizzy · Joined: 07 Aug 2012 Posts: 4749 Location: Cheshire, England

woodrim · Joined: 14 Jan 2010 Posts: 4066 Location: Charleston

I detailed a procedure in a post once. I'll see if I can find it before recreating.

woodrim · Joined: 14 Jan 2010 Posts: 4066 Location: Charleston

Found it.

In PS, you simply enlarge the image enough to see the CA clearly, then go to Image - Adjustments - Hue/Saturation. Then change the menu selection where it says Master to the color you're correcting, most cases blue, but sometimes magenta. If you're wrong, it will correct the selection. Then take the pointer, which is now an eyedropper tool, and click on the CA where the color is obvious. You'll then see that color come up in your swatch selection. Now take the saturation and lightness sliders and find the best reductions to correct the CA. I typically do them about equally, but you can see the change as you're doing it and will know how much to adjust. Note: don't forget to select the color from the Master, otherwise the entire image will be effected, not just the CA color/area.

philslizzy · Joined: 07 Aug 2012 Posts: 4749 Location: Cheshire, England

Ok I tried it, its not got all of the CA but I concentrated on the gloved hand. the lifebelt seems to have lost its colour too but If i use 'auto color' it (sort of) comes back.

Thanks for that useful tip. I'll look more into it. Although the CA is not that much of a problem.

woodrim · Joined: 14 Jan 2010 Posts: 4066 Location: Charleston

Your offending fringe was magenta or red, so you would have selected magenta from the drop down menu and if it Photoshop recognized it as a different color, it would correct you choice when you sampled the color with the eyedropper. It is important to be selective of color in that drop down, otherwise leaving it as "Master" will change the entire picture. There are times when the same color tone will exist elsewhere in the photo as may have happened with yours. In those cases, you can isolate an area for treatment using one of the drawing tools like the "Polygonal Lasso Tool". Or you can return a color to original using the history brush. Red CA is a little harder to correct than blue.