It's the editing screen from PhotoShop Elements version 6:
The screen is customizable - little windows can be shown or hidden and can be moved around. The one I use a lot is the "Info" window and it, too, can be customized as to what info it shows. To bring it up, see above: in the menu bar select 'Windows', scroll down to and click on 'Info'. The small window (which I have at bottom right) appears somewhere; you can move it but not resize it. It has a link at it's top right 'More>' click on it to set the info it shows - I use RGB at left and HSB at right.
Now, in RGB, if any value is 255 or 0 there is a possible problem. In HSB, if S (saturation) is 100% or 0% there is a possible problem. I say "possible" because at, say, 255 a color might
just be at it's maximum brightness value but, more likely, it's clipped. The sure way is to allow flower petal RGB values of no greater than 254 and no less than 1; for saturation, no greater than 99% and no less than 1%.
In any image on-screen, the difference between 255 and 254, or 0 and 1, or 100% and 99% can
not be seen, so you are losing nothing with that restriction. On the other hand, both over-saturation and brightness clipping cause color changes. Some people can accept that for a "prettier" flower rendition; I can not.