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Bright magenta image issue

Fogtripper

US
131 posts

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Fogtripper Silver Member Nikonian since 27th Jul 2004
Thu 13-Dec-12 02:07 PM | edited Thu 13-Dec-12 02:13 PM by Fogtripper

Just noticed this after shooting some xmas decorations. The bright magenta part of images have a weird graphical glitch:



D700, ISO 200, RAW
Image is saved at full rez as shot.

edit: Do we have a type of tag here? Sorry about the huge image.

gkaiseril

Chicago, US
6739 posts

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#1. "RE: Bright magenta image issue" | In response to Reply # 0

gkaiseril Gold Member Nikonian since 28th Oct 2005
Thu 13-Dec-12 06:23 PM | edited Thu 13-Dec-12 06:33 PM by gkaiseril

Have you tried to adjust the White Balance?

Purples are difficult to capture with a digital sensor if WB is not just right. If you look at the beyer filter the number of the RGB filter cells is not evenly balanced.

Unfortunately you stripped the Exif data from the image.

George
My Nikonian Galleries

Fogtripper

US
131 posts

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#2. "RE: Bright magenta image issue" | In response to Reply # 1

Fogtripper Silver Member Nikonian since 26th Jul 2004
Thu 13-Dec-12 09:11 PM | edited Thu 13-Dec-12 09:12 PM by Fogtripper

I shoot in RAW and never mess with white balance until processing in camera raw/photoshop.

Fogtripper

US
131 posts

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#3. "RE: Bright magenta image issue" | In response to Reply # 2

Fogtripper Silver Member Nikonian since 26th Jul 2004
Thu 13-Dec-12 09:52 PM

Original RAW file:
http://www.depthafield.com/images/DSC_1628.NEF

danshep

Olympia, US
1629 posts

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#4. "RE: Bright magenta image issue" | In response to Reply # 0

danshep Gold Member Charter Member
Thu 13-Dec-12 11:33 PM


Strangely, it is not in the pure pinkish areas, but only those, where there is yellow and pink combined.


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Fogtripper

US
131 posts

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#5. "RE: Bright magenta image issue" | In response to Reply # 4

Fogtripper Silver Member Nikonian since 26th Jul 2004
Fri 14-Dec-12 03:23 PM

>
>Strangely, it is not in the pure pinkish areas, but only
>those, where there is yellow and pink combined.

I think the camera created the yellow in those sections due to the brightness. IN the other pink/magenta areas, it is still more noticeably pixelated.

gheck58

Aliso Viejo, US
2911 posts

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#6. "RE: Bright magenta image issue" | In response to Reply # 5

gheck58 Silver Member Nikonian since 26th Dec 2003
Mon 31-Dec-12 03:46 PM | edited Mon 31-Dec-12 04:03 PM by gheck58

The red channel on most of the older Nikon's (maybe new also) like D300, D700, etc. is very easy to blow out. This type of image is very demanding on a camera sensor. Check your camera's RGB histogram and I can almost guarantee you the red channel is clipped. There's no way you're going to get an even exposure on a Christmas tree without some amount of fill light (flash and drag the shutter). So try taking the same shot with about -.7 to 1 stop underexposure dialed in. But even with lot's of underexpose you'll never get a light bulb properly exposed without the rest of the tree going completely dark. I find 3/4 stop works well for most situations like red flowers, etc. Then you can bring some of the shadows back up in the software.

Hecky

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