2 Replies Latest reply on Jun 2, 2014 1:46 AM by Monstrik

    Clipping blacks and whites

    Monstrik Level 1

      Please can anyone tell me what number would ensure that i have at least one pixel pure black and at least one pixel pure white...? i've realised that 0.01% doesn't do the job... But 1 does make it look like it has gone over the top...i want to go till i reach clipping but no more than that. what number would ensure it?

      image.jpg

        • 1. Re: Clipping blacks and whites
          Trevor.Dennis Adobe Community Professional (Moderator)

          If these are RAW files, then it is better to set black and white points in ACR.  If you Shift open the processed RAW file to open as a Smart object, these settings are non destructive, and editable.

           

          Setting black and white points by the numbers in Photoshop is risky, because no two images are the same.  You might want to block out noisy shadows, or ignore specular highlights, and set white point to a more meaningful part of the image.  So if you really want to sort out these points inside Photoshop, a better approach might be to use a Levels Adjustment layer, and hold down the Alp (Opt) key while dragging the black and white sliders.  This puts the image in Threshold mode, so you can see exactly what parts of the image are being clipped, as well as which channels, or combination of channels are being clipped.

           

          But using ACR is a no brainer.  You have the full image bit depth to play with for a start.

          • 2. Re: Clipping blacks and whites
            Monstrik Level 1

            I appreciate your advice Trevor. But still, i need to understand these clip numbers. I edit thousands of pictures, and i need to work fast. I want to use it as an auto function. It is going to be within action steps. I want to enchance contrast by clipping white and blacks, and it has to be a subtle adjustment. I want to get at least one pixel pure black and one pure white.No more than that. Which number makes sure that at least one pixel of black clips?