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| p.1 #10 · 5dmk2, problems with pure reds (and sometimes blues) |
You are almost certainly blowing out the red channel. First, check exposure using the histogram display. Second, be sure to set it so that you can see the three individual color channels - otherwise the average luminosity may "overlook" an overly strong level in only one of them. Third, it isn't bad idea with a subject that is very intense in one of the channels (though red is the most likely culprit) to simply under expose just a bit if possible.
By the way, as to the question of whether the histogram is "reliable" or not... it is reliable, but you must learn to interpret it.
I have a problem in some of my photos, most commonly with the clothing that people wear that is mono-color, like a cap or dress that is pure red or a skirt that is a pure blue in color.
I'm not sure exactly how to describe this -- but sometimes I find that if the object is even slightly covered by shadow, the 'tonal depth(?)' is poor, or the jump from one luminance level to the next is very visible. Things end up looking like 'mush', and it shows even when viewed on a computer monitor (32-bit color) and/or resized at much lower resolution for online viewing.
I'm always shooting raw, most of the time I use DPP to convert but occasionally I use Photoshop elements 10. One of the things mentioned online is "Highlight Tone Priority", I've got that in 'My Menu' for quick access and turning that off can sometimes alleviate that problem. But I've checked my photos from this last weekend and other times, even with that off I still get this problem sometimes. Anything else I should be trying? I'm always using expose-to-the-right and sometimes I have this problem even if I'm pulling the exposure back by half a stop or so.
It only happens, or it's only noticeable when it happens with mono-color. I've never seen it happen on my 5d2 for colors like orange, pink, turquoise, yellow, white, etc. And I've never seen it with green either. ISO 100~200, f/1.8~f/2.8, and reasonable daytime shutter speeds like between 1/2000 and 1/400.