if someone could post a "clipped" histogram it would be great. i havent figured that much out yet for some reason.
"clipped" generally means that the highlights are overexposed in such a way that all detail, in that area, is lost beyond recovery in pp. the most common that i see is on a sunny day with a hazy, milky sky. its almost impossible to get the correct exposure on the subjects without "blowing" out the sky. in this case, "blowing" and "clipping" are synonymous because the blown highlights, on a histogram, will be clipped/chopped off on the right side of the graph. i hope that makes sense. a picture of an overexposed histogram would really drive the description home.
however, with digital shooting, we also have RGB histograms. and, it is not uncommon for only one of the color channels to be "clipped." in your case, it looks like the reds would be clipped off on the right side of the "R" channel. that doesnt mean the whole flower is blown out.....just part of it.
again, the only reason i mentioned it to you was because i had absolute FITS with that problem earlier this spring with my azaleas. and, again this summer with my impatiens and purple coneflowers. i have to underexpose the rest to bring the "curve" of the histogram graph back into range. i was amazed at how easily red/pink/purple flowers blew out...even without sun shining directly on them.
god, i wish i could post the histograms. however, if you search (here or otherwise) for exposure articles and/or reading histogram articles, you will quickly find something that describes what i am talking about.
and, if i hadnt purged most of my shots of blown flowers, i could post them to show you what i was talking about, too. but, as for now, i am just the guy that is picking up on when i see things that happen to me, but cant articulate the problem very well just yet. all in the growth curve...lol.
hope that explains things a little bit more. sorry i cant do the job i know can be done with the illustrating to really drive it home.