Colour Issue

ptrjong · Tue Oct 09, 2012 10:15 am

Hi all,

It would seem that the colours in my photos have an abberration towards the red, but not over the whole spectrum; only towards the highlights/light parties.

Am I seeing things, of might this make any sense? If so, what might cause it? And what might fix it?

Thanks,

Peter

maaximm · Tue Oct 09, 2012 10:53 am

Hi, try to correct in Photoshop tool "color change"

dendrobatid · Tue Oct 09, 2012 12:38 pm

Peter
The curve can be used to give very precise colour control
An excellent tutorial here

http://www.thegoldenmean.com/technique/curves1.html

Mick Bajcar

ptrjong · Tue Oct 09, 2012 1:04 pm

Hi Mick.

Unfortunately I'm using Photoshop Elements nowadays, and although Elements 10 has a basic Curves function, it doesn't offer separate colour channels.

There is a way of removing some red or adding some blue to the highlights, though. I think I'm starting to learn how to deal with this, but would rather prevent it in the first place.

Would this be a peculiarity of my camera type (Nikon D90) or even my copy?

dlowwa · Tue Oct 09, 2012 11:12 pm

Quoting ptrjong (Thread starter):
Am I seeing things, of might this make any sense? If so, what might cause it? And what might fix it?

Could you perhaps post some examples? It sounds like you're describing chromatic aberration which is caused by flaws in the lens, but is often correctable with software. It would be best to see some examples to be sure.

scopedude · Tue Oct 09, 2012 11:55 pm

Quoting ptrjong (Reply 3):
There is a way of removing some red or adding some blue to the highlights, though. I think I'm starting to learn how to deal with this, but would rather prevent it in the first place.

That sounds like chromatic aberration from the lens. I personally use LR 4.2 and it removes this kind of aberration very well. Just use either the lens profile and/or tick the Remove Chromatic Aberration box. Sometimes atmosphere can cause this kind of effect too.

ptrjong · Wed Oct 10, 2012 12:01 am

Hi dlowwa,

I haven't noticed differences with different lenses, so I wouldn't think it's a lens problem.

This one is straight from the camera, only resized.

http://www.horizonten.nl/pix/204.jpg

The light parties seem a bit too red, and the dark parties a bit too blue. To be honest I don't see it myself, but the pixel info confirms it to some extent, and this often seems to be noticeable for you screeners, at least after my editing.

If you tell me this picture is fine colour-wise, then I'm obviously over-editing at some point.

Peter

(Mods feel free to move this to the Feedback forum if you must, although I think it's a pity, since this forum is so dead.)

scopedude · Wed Oct 10, 2012 1:41 am

That might be atmospheric, high humidity in the air causing such aberration. It's like shooting through a giant lens.

just my 0.02

dlowwa · Wed Oct 10, 2012 2:12 am

Quoting ptrjong (Reply 6):
If you tell me this picture is fine colour-wise, then I'm obviously over-editing at some point.

No, I definitely notice the pink cast you're talking about. The atmospheric conditions (i.e. very low contrast) may be exacerbating it. Can't say for sure what's causing it, but possibly camera related. If you have the raw file, that would be pretty useful in determining whether it's that or maybe something else. You can send me it if you do.

ptrjong · Wed Oct 10, 2012 7:11 am

Thanks guys. I don't think this is limited to this particular day.

Dlowwa, where can I send the RAW file to? Thanks.

dendrobatid · Wed Oct 10, 2012 7:40 am

Peter
I can see the cast too though it is not much at all and I would find that very simple to correct just using colour balance.

Quoting ptrjong (Reply 6):
If you tell me this picture is fine colour-wise, then I'm obviously over-editing at some point.

That could be an issue ! If you are boosting the saturation that will exaggerate any cast, quite a common problem too.

Mick

dlowwa · Wed Oct 10, 2012 8:07 am

Quoting ptrjong (Reply 9):
Dlowwa, where can I send the RAW file to? Thanks.

Send me a message and I'll give you my email.

vikkyvik · Wed Oct 10, 2012 3:42 pm

Quoting ptrjong (Reply 6):
This one is straight from the camera, only resized.

http://www.horizonten.nl/pix/204.jpg

The light parties seem a bit too red, and the dark parties a bit too blue. To be honest I don't see it myself, but the pixel info confirms it to some extent, and this often seems to be noticeable for you screeners, at least after my editing.

I see the same thing quite frequently with my 50D. When editing the RAW file prior to exporting, I've gotten in the habit of tweaking the red channel a bit to reduce the cast. If it needs more, then when editing the JPEG, I'll either use color balance, or more commonly, I'll go to Levels, select the red channel, and move the midtones slider down to somewhere between .92 and .97, depending on how much correction is needed.

Someone else on here mentioned that technique, but I can't remember who.

The worst is shooting against an overcast sky. Those are a giant pain to color balance properly when everything seems to have a red cast.

dlowwa · Sat Oct 13, 2012 6:40 am

So, having seen the RAW file, it does seem that it is a very simple white-balance issue, which is of course easily fixed when converting from RAW (somewhat relevant to the other thread about shooting jpeg vs. RAW, as this kind of correction is typically much more difficult when working from a jpeg only). Vik, the in-camera white balance settings applied do have that slightly red cast you describe, but he's using a Nikon.

Compare to the version Peter posted above:

vikkyvik · Sat Oct 13, 2012 7:22 am

Quoting dlowwa (Reply 13):
Vik, the in-camera white balance settings applied do have that slightly red cast you describe, but he's using a Nikon.

I know, I was just mentioning what I usually do about it, since he seems to have a similar issue.

To fix that shot, did you just change the color temp? Or was there more to it?

Thanks.

dlowwa · Sat Oct 13, 2012 8:44 am

Quoting vikkyvik (Reply 14):
To fix that shot, did you just change the color temp? Or was there more to it?

Just the white balance in ACR. Temperature about the same, but tint more to the left (green).

ptrjong · Sat Oct 13, 2012 9:45 am

Thanks Dana.

Quoting dlowwa (Reply 15):
Temperature about the same, but tint more to the left (green).

So this should be the basic trick, both in Camera RAW and in my camera?

dlowwa · Sat Oct 13, 2012 10:22 am

Quoting ptrjong (Reply 16):
So this should be the basic trick, both in Camera RAW and in my camera?

It will depend on each scene, as light is never consistent, but for the image above that was all it took, yes.

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