looking for a certain luminosity tool

just something im used to. dpp uses it and i think photoshop 7 also. its a histogram with 3 slidable vertical lines shadows midpoint and highlights.
ive seen already that rt has multiple probably better ways of doing the same thing but i really like that tool. i cant find it. is it not in rt (probably not, its a pretty unsophisticated tool) thought id ask though.

Shadows/highlights is pretty close.

thanks paper. thats what ive been using. works fine. im just more at home with something like this

no problem IMG_0175

im not sure if i did the picture thing right

guess i did

you can also have a look at this: 2. Tone curve: your single point of success | paulsphotopalace

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alberto. that was a big help. it looks like a great tool and pauls directions were clear!
thank you