Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: ErikKaffehr on July 20, 2011, 01:06:48 pm

Title: Is this color Moiré? Or is it something else?
Post by: ErikKaffehr on July 20, 2011, 01:06:48 pm

Hi,

I happen to have a picture with something that looks like color Moiré, but may be something else. What is your take?

The image was taken with a 400 mm lens + 1.4 extender at f/10. I was not expecting Moiré but I see something that looks like Moiré to me. The camera I used was a Sony Alpha SLT55. It is 16 MP on APS/C. It is possible that it has little in way of OLP filtering, I don't know.

Best regards
Erik

Title: Re: Is this color Moiré? Or is it something else?
Post by: Bart_van_der_Wolf on July 20, 2011, 01:16:46 pm

Quote from: ErikKaffehr on July 20, 2011, 01:06:48 pm

I happen to have a picture with something that looks like color Moiré, but may be something else. What is your take?

Hi Erik,

It might have something to do with it, although with all the glass and f/10 it is not that likely. It could also be light refraction in the hairs. Maybe it is just false color artifacts from the demosaicing process. Which Raw converter did you use? Does another Raw converter show the same?

Cheers,
Bart

Title: Re: Is this color Moiré? Or is it something else?
Post by: ErikKaffehr on July 20, 2011, 01:28:12 pm

Hi,

I used LR 3. The image is very similar with "process version 2003" and it seems that I don't have burned out highlights. I may test with some other raw-converters but it could take until next week as I go abroad a couple of days. Sharpening matters little and the pattern is also visible in monochrome.

Best regards
Erik

Quote from: BartvanderWolf on July 20, 2011, 01:16:46 pm

Hi Erik,

It might have something to do with it, although with all the glass and f/10 it is not that likely. It could also be light refraction in the hairs. Maybe it is just false color artifacts from the demosaicing process. Which Raw converter did you use? Does another Raw converter show the same?

Cheers,
Bart

Title: Re: Is this color Moiré? Or is it something else?
Post by: fike on July 20, 2011, 03:07:30 pm

I agree that with all that glass, it could be something like chromatic aberration along the edges of highlighted whiskers. 

Title: Re: Is this color Moiré? Or is it something else?
Post by: ErikKaffehr on July 20, 2011, 03:28:16 pm

Hi!

No, I don't think so. I know what chromatic aberration looks like. Also this is actually at center of the image so it cannot be lateral chromatic aberration and axial chroma looks very different.

This crop is four times magnification (4:1):

Best regards
Erik

Quote from: fike on July 20, 2011, 03:07:30 pm

I agree that with all that glass, it could be something like chromatic aberration along the edges of highlighted whiskers. 

Title: Re: Is this color Moiré? Or is it something else?
Post by: ErikKaffehr on July 20, 2011, 04:04:22 pm

Bart,

I looked at another picture from the series and developed with RawDeveloper, I'd say the artifacts are still there but much less visible:

Best regards
Erik

Quote from: ErikKaffehr on July 20, 2011, 01:28:12 pm

Hi,

I used LR 3. The image is very similar with "process version 2003" and it seems that I don't have burned out highlights. I may test with some other raw-converters but it could take until next week as I go abroad a couple of days. Sharpening matters little and the pattern is also visible in monochrome.

Best regards
Erik