why are there purple color spots on this photo

<p>Hello,<br />on some of my photos purple color spots appear. You can see it on the top of the attached example photo. I have used a lee filter GD 0.6, however, I have examples without using a filter which show purple spots also. I have noticed that this happens in particular in the sky, where I have light and dark areas close to each other. Is this color fringe or chromatic aberration? How to avoid it?<br>

Thank you very much!<br>

Dirk</p><div></div>

<p>You don't say what aperture you were using, but I'm guessing it was small, maybe f8-16. Often at these apertures, dust spots on the sensor will show up similarly to what appears in your shot.</p>

<p>I don't see any spots. Do you have a better example?</p>

<p>I mean the slightly purple areas in the clouds at the top of the image. I try to upload another example....</p><div></div>

<p>Sorry, still can't really see the issue. The colors don't look particularly unusual to me.</p>

<p>If I am understanding you right then I think these purplish areas are natural sunset cloud colours - at least as seen by the camera. Here is an example of mine where the cloud at the top of my shot is a grey-purple colour and seems to me to be a natural result of the effect of sunset through clouds where the colours get split up in interesting ways. Is that the sort of thing you meant?<br>

I also used an ND grad here which may make the colours more obvious than to the naked eye.</p><div></div>

<p>These images look OK to me too, for what it's worth...</p>

<p>I did a crop of the sky to better show what I mean.... There were no purple colors in the sky when I took the shot only grey and white clouds. The sun was quite high and illuminated the blue sky above the clouds (almost not visible). The purple colors I mean are also reflected on the water in the front... (maybe I am already seeing things which are not there....?) Thanks in advance!</p><div></div>

<p>Hi. I cannot see any pronounced purple colored spots in any of the posted pictures, neither can I see any color fringing or chromatic aberration, but have you tried to adjust the white balance?</p>

 

<p>No one else seems to be able to see these colours. Perhaps your monitor needs calibrating?</p>

<p>I will calibrate the monitor and see what happens...<br>

Thanks!</p>

<blockquote><b>Dirk Marwede wrote:</b><p>The purple colors I mean are also reflected on the water in the front...</blockquote>

<p>

The key to your "problem" is in that statement. Whatever is reflected on the water is absolutely external to the camera. Hence what you see in the sky is from the sky and is not an artifact.

<p>

The exact color might well be an artifact though. Color in clouds, such as at sunset or sunrise, is difficult to define either with a camera sensor or with our eyes. The same is true of most colors in a light source. Hence pictures of Aurora Borealis, Christmas lights, fireworks and a number of similar scenarios commonly don't necessarily look the same as what we could see with our eyes at the time. Typically you can vary the exposure to get variations in the exact color. And in processing it may be that changing brightness, contrast, and saturation will also result in interesting color variations.

<p>

Indeed, I personally dislike shooting sunset/sunrise images, fireworks or the Aurora! I find trying to post process such an image is far too frustrating because there is no single best result and instead there are about an infinite, plus 1, great choices to pick from for each and every single exposure. On the other hand I know several people who just love exactly that, because they can always get a good picture!

<p>I agree with Floyd. If you are referring to the purple clouds (not spots) this could be the result of underexposure. Try boosting the exposure in post and see what happens. Better yet, do another shoot and bracket your exposure. This will help to troubleshoot the problem. Best of success! </p><div></div>