We're talking about two different things here, imo. Chrissie is talking about a whole photo adjustment, where as BA is talking about select zone adjustment. The latter would fall more readily into the manipulation column, imo.
Having said that, I can see where allowing any adjustment could open a bigger can of worms than we'd want to deal with. The debate on which "adjustments" are acceptable and which aren't could go on for ages. To level the playing field, I would be more inclined to agree to a "zero adjustment" policy, which is what I was under the impression we had to this point.
To date, I have not seen any conclusive proof that ACID's image was manipulated in any way (other than resized/cropped). If anyone can offer definitive proof that her photo was adjusted in the way people claim, suppose and hypothesise it was, then the decision to add her to the poll will be revisited. Until then, her entry stays in. In my world, as much as someone may appear guilty, unless you have concrete proof against the person, the person should neither be charged, nor convicted, nor sentenced. That's just me though.