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T3i: Blue Color in High Contrast Areas?

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Alex Walton
T3i: Blue Color in High Contrast Areas?
on Apr 12, 2012 at 6:13:22 am

I'm shooting with a T3i, and I'm noticing some blue color in sharp, dark areas. Here is a still to compare:

http://i53.photobucket.com/albums/g76/YodaSmeagol/BlueLines.jpg

There are many areas, including the wrinkles in the skin, and sticks in the background, that appear to be a bland blue color. This is only slightly color corrected; the blue wrinkles are in the original raw files, only emphasized by the correction. Here is an extreme correction that shows the blue highlights:

http://i53.photobucket.com/albums/g76/YodaSmeagol/BlueLines2.jpg

Same thing can also be seen in this shot:

http://i53.photobucket.com/albums/g76/YodaSmeagol/CanyonlandThumbnail.jpg

Could this be an effect of moire? Has anyone else ever seen this? I've shot with a T2i for a while and never noticed it. Just got the T3i last month, and seen this once or twice. Here are my settings that are factors to consider:

Shot with a 17-50 Sigma 2.8 lens. I'm using Magic Lantern, and a Marvels Cine style. My shooting settings were (as best as I can recall) 1080 24p, 1/48 shutter speed, ISO 160 and aperture around f/11? I was using 3x Zoom mode sometimes, but I don't think I was in either of these shots, but I could be mistaken.


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Peter Burger
Re: T3i: Blue Color in High Contrast Areas?
on Apr 12, 2012 at 6:52:18 am

Yup, I'd also say it's moiré. Typical for areas like that (the high contrasty wrinkles)...

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Phil Balsdon
Re: T3i: Blue Color in High Contrast Areas?
on Apr 12, 2012 at 8:43:16 am

I'd agree with Peter's opinion too, but that's still pretty excessive moire, what are sharpness settings on the camera scene file you're using? Wind them right down. You can put a little bit of sharpness back in post if you need too. Proof that the Sigma must have excellent resolution too.

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