Originally posted by narual My K5 does this all the time with magenta and red, especially on flowers on sunny days, and red/pink spotlights at shows. The details are still there if you desaturate. I usually cope by going into Camera Calibration in Lightroom and dropping the red primary saturation by 10-20. Sometimes tilting the red balance to orange by 5-10 brings some of the detail back without sacrificing too much of the color.
Modifying the exposure doesn't usually seem to help much.
Of course, if you're shooting in jpg only, the details are probably lost. Why cripple yourself?
My investigation indicates the red channel is over exposed by as much as 4 stops, its impossible to tell how much because it looks like at least half the red has been lost and thrown away. Who knows what was originally there.
To a great extent it doesn't matter, the detail is not separately in the colour channels, it is a mixture of green blue and red channel information. Some manufacturers sample edges data in the green channel (the green channel alone holds 50% of the image details). Other manufacturers sample edge changes from all channels.
So when you desaturate the details appear because most are held in the green channel and just about everything is present in all three channels.
Take test images recreate the situation. take one as metered, one 3 stops underexposed one 4 stops and one 5 stops underexposed. Then in post bring the brightness of all to the same level. Then compare them to see if this effect is reduced as I expect it to be.
Ultimately the workaround is likely to be a mixture of underexposure and some red channel enhancement in post, but lets first find out how much underexposure is needed.