Announcement

Collapse
No announcement yet.

neutral black and white adjustament layer

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • neutral black and white adjustament layer

    hi

    i'm looking for neutral values (reds yellows greens cyans blues magentas ) about photoshop black and white layer

    i have found in this forum neutral values but i lost them

    for example with these neutral values , an black and white adjustament layer set to luminocity doe Not add contrast to the image , leave the image intact

    thanks

  • #2
    Re: neutral black and white adjustament layer

    If I understand your question correctly, you would need something close to Perceptual. The numbers I use for that are R46, Y97, G84, C88, B14, M49 It doesn't always get me 100% accurate - but it's fairly close.

    PS Edited. The above numbers are wrong - it should be R31, Y88, G58, C72, B10, M40.....which are fairly close, but not 100% accurate.
    Last edited by AKMac; 08-18-2015, 04:18 PM. Reason: Wrong Information

    Comment


    • #3
      Re: neutral black and white adjustament layer

      The numbers AKMac gives for a B&W adjustment layer are good. Probably as close as you can get using the adjustment layer.

      For a perfect "neutral" just add a solid neutral filled layer set to Color mode. Fill the layer with black, white, or any shade of gray - does not matter. Stamp visible a new layer on top of that. Set it to Luminosity mode. Delete the fill layer. Toggle the B&W Luminosity layer on and off to see there is no difference.

      Comment


      • #4
        Re: neutral black and white adjustament layer

        Originally posted by AKMac View Post
        If I understand your question correctly, you would need something close to Perceptual. The numbers I use for that are R46, Y97, G84, C88, B14, M49 It doesn't always get me 100% accurate - but it's fairly close.

        PS Edited. The above numbers are wrong - it should be R31, Y88, G58, C72, B10, M40.....which are fairly close, but not 100% accurate.
        HI
        I found these values maybe you can try them
        Attached Files

        Comment


        • #5
          Re: neutral black and white adjustament layer

          @MANTRA

          I tried your numbers and they seem to be 100% accurate.

          Please ignore my previous suggestions.

          Comment


          • #6
            Re: neutral black and white adjustament layer

            Originally posted by redcrown View Post
            The numbers AKMac gives for a B&W adjustment layer are good. Probably as close as you can get using the adjustment layer.

            For a perfect "neutral" just add a solid neutral filled layer set to Color mode. Fill the layer with black, white, or any shade of gray - does not matter. Stamp visible a new layer on top of that. Set it to Luminosity mode. Delete the fill layer. Toggle the B&W Luminosity layer on and off to see there is no difference.
            Your suggestion would give the average of the 3 trichromatic values assigned to each one so
            r = g = b = (r + g + b) / 3

            You wouldn't program it that way, but that's the result of the arithmetic. The question is actually interesting, because it makes me wonder if there's a unique combination that would yield this across any image. I doubt it, but I want to test it later.

            I'm looking at its defaults, and it seems to be relying on oppositions to make something they think of as neutral. I get the defaults
            r 40 y 60 g 40 c 60 b 20 m 80

            It seems to treat primary wavelength colors as opponents to corresponding pigment colors that would be used to create that color.

            m + y - r = 80 + 60 - 40 = 100
            c + m - g = 60 + 80 - 40 = 100
            c + y - b = 60 + 60 - 20 = 100

            I'm not sure there's a precise neutral basis though. It seems as if it's dependent on the content. I'm not positive, because I rarely use the tool and haven't bothered to test it.

            Comment


            • #7
              Re: neutral black and white adjustament layer

              Originally posted by AKMac View Post
              @MANTRA

              I tried your numbers and they seem to be 100% accurate.

              Please ignore my previous suggestions.
              Hi Akmac
              perfect , i have lost them
              i spent some time to find them out

              Comment


              • #8
                Re: neutral black and white adjustament layer

                Channel Mixer:

                Monochrome: Checked
                Red: 30
                Green: 59
                Blue: 11

                Black/White Adjustment Layer:

                Red: 30
                Yellow: 89
                Green: 59
                Cyan: 70
                Blue: 11
                Magenta: 41

                Photoshop calculates luminance by a weighted average of the three channels The weighting assumes that green represents 59% of the perceived luminosity, while the red and blue channels account for just 30% and 11%. Since Cyan is the compliment to the Red channel, you can calculate the Cyan value by taking 100(%) and subtracting the Red and likewise for the other channels. For instance for Yellow, 100% - 11% (B) = 89%

                Comment


                • #9
                  Re: neutral black and white adjustament layer

                  Originally posted by cameronrad View Post
                  Channel Mixer:

                  Monochrome: Checked
                  Red: 30
                  Green: 59
                  Blue: 11
                  hi
                  yes ! great

                  Comment

                  Related Topics

                  Collapse

                  • neeper
                    Black and White photo adjustments
                    by neeper








                    Try this technique, you should get something similar to it, each image is different so adjust accordingly.

                    First, what did I want to achieve.
                    - black and white
                    - metallic look
                    - sharp detail
                    ...
                    01-10-2009, 10:36 PM
                  • The Old Man
                    Achieving this soft yet contrasty Black and White?
                    by The Old Man
                    Hello Gents!

                    Been a long time reader of this forum and it helped me a lot in making the transition from film to digital and finding an interest in beauty retouching. Today I need your help. A specific type of black and white conversion technique keeps eluding me. It is soft and light...
                    08-05-2014, 04:06 PM
                  • DannyRaphael
                    TRY IT 001: Portraits using Find Edges + Levels
                    by DannyRaphael
                    Photoshop 7.01, but this applies to any version.

                    Since I have no traditional drawing skills, I've always liked the Filter > Stylize > Find Edges filter when it comes to converting portraits to photo-art.

                    This method works better on close-ups than "far away shots."...
                    07-01-2003, 02:40 PM
                  • ybt
                    Adjustment Layer & Layer Set
                    by ybt
                    I have a file that has a two layer sets and a background layer. I would like to apply an adjustment layer to the entire "top" layer set, but not have it impact the "bottom" layer set or the background layer.

                    Is there a way to limit an adjustment layer to impact only...
                    11-15-2003, 12:21 AM
                  • Tabby M.
                    need help w/ color loss? shift? bad photographer? Ha!
                    by Tabby M.
                    Hi everyone, I'm new here and also to retouching. My friend wanted me to 'fix' her photo from 1980. She's Cuban and her husband is Peruvian but somehow when I use either Photoshop LE 5.0 or Gimp's Levels 'black and white' eye droppers, I end up with two people who have blue or purple lips, and their...
                    08-06-2005, 02:34 AM
                  Working...
                  X