Pixel location on histogram

[JakAHearts]

Is there a program that allows you to eyedropper a pixel and see exactly where it is at on the histogram?

[yb98]

An RGB histogram is composed of 3 shapes :
the Red shape represents the number of occurences of the 256 red values in the pic, and same thing for Green and Blue shapes.
So if you consider a pixel, it is represented by 3 values R, G and B.
So in the histogram you will have a position on the x axis corresponding to the R value of the pixel, and another position on the x axis corresponding to the G value of the pixel and another position on the x axis corresponding to the B value of the pixel.
So there are 3 positions on the x axis corresponding to the pixel and not only one position.

If you consider a luminance histogram, then you have only one value which is the luminance that is represented in the histogram and so you will have only one position on the x axis corresponding to the pixel.

If you are interested by a given pixel, you can see directly its RGB values in the status bar of DPP. If you want its luminance value you can use the DPP++ plugin.
Other softwares such as photoshop will allow you also to see this information.

[JakAHearts]

No kidding, thank you! Also, I was about to ask where to get DPP++ but then I saw your sig. THANKS SO MUCH!

[frenchconnector]

Photoshop and Aperture can show the eye-dropper point on the histogram (whatever channel you pick) on their Curves adjustment. All others should be able to show it too, I would imagine.

[tzalman]

Picture Window Pro