Originally posted by dh4412 thanks for your replies, still not sure about this setting, i've tried it numerous times, but can't really see a great difference in the images, maybe it is very subtle ? i'll maybe experiment with it some more, what i get from your replies is it's for high contrast bright scenes more than in lower light ?
The way to tell the difference is if you have a photo editor that can show you a histogram within a selection.
When I got my K7 I took several shots using a tripod, at a rather high contrast flower in the garden. COntrast was largely due to direct lighting and shadows. I took one shot with no corrections, one with shawdow protection, one with highlight protection and one with both.
WHat I saw, using spot metering was the following.
Shadow protection did not alter any histogram values above the metering point, and for values about 2 stops below the metering point. i.e. histogram value of about 40 in the origonal (note. metering point has a histogram of about 120 and with neutral contrast every 40 within +/-90 of metering is roughly 1 stop), the histogram value was increased by almost 1 stop.
A similar reduction in the histogram was observed with highlight protection, which only acted on parts of the photo above the metering point, and with both on, the entire histogram in the linear portion had about an overall increase in dynamic range of about 2 stops.
You can do the test, and if you can find a subject with about 14 stops between darkest and brightest, you could probably map out the effectiveness over the entire histogram