3 Replies Latest reply on Jul 15, 2009 10:29 AM by TᴀW

    Calibration?

    TᴀW Adobe Community Professional & MVP

      I'm wondering whether I need to calibrate my LCD, or whether profiling it is enough.

       

      I've got a Dell 24 in 2407WFP. I'm very happy with it. The colours look great, skin tones are fine. It's set on the factory standard Contrast 50 and Brightness 50.

       

      I don't really want to change anything.

       

      My viewing conditions are regular, non-colour management aware: white and beige walls, no viewing box, no special lighting etc.

       

      I've run Sonera's DisplayMate tests. I'm seeing all the shades of grey and white. In Photoshop, I did the test in the book: I set a black screen, made a square selection, and moved the dark level up by 1. I saw the difference.

       

      So I'm wondering: Am I allowed not to calibrate my monitor, but simply profile it as is?

       

      Thanks,

      Ariel

        • 1. Re: Calibration?
          Rick McCleary Level 3

          Hmmm.. Simple question, a short and a long answer.

           

          Short answer:

          you must calibrate your monitor.

           

          Longer answer:

          Calibrating the monitor sets two parameters: brightness (or "luminosity") and color balance (or "white point"). Both of these are important because they influence how you see an image on the screen and are completely independent of the profiling process.

           

          When preparing files for print (as you're doing for the children's book), you want to set your calibration so that white as seen on your monitor in Photoshop (255/255/255) matches the brightness and color of a white sheet of paper held next to the monitor. (This is, of course, also influenced by the lighting in your work area - another topic of conversation.)

           

          Most monitors can have their white points adjusted in a range from 5,000ºK to 9,300ºK. 9,300 is very blue, 5,000 seems very yellow by comparison. A general rule of thumb is to choose 5,000 to 5,500 if the majority of your work is for print, 6,500 if the majority of your work is for web. In any case, once you choose a white point, stick with it, don't change it. BTW, for all practical purposes, D50 = 5,000ºK and D65 = 6,500ºK.

           

          Luminosity is measured in candelas per square meter (cd/m2). Out-of-the-box. most monitors are set to their maxmimum (450 cd/m2, or more). Again, the rule of thumb is to choose a setting between 100 and 140. Of course, the lighting in your work environment will play into this decision.

           

          A common complaint is that prints always look darker than the monitor. More often than not, this is because the monitor is too bright (i.e., the cd/m2 is to high.)

           

          At any rate, I don't know what it means to have your monitor set to "the factory standard Contrast 50 and Brightness 50". The only way to create a good, accurate calibration/profile set-up for your monitor is to use a hardware device like an i1Display 2.

           

          That's the brief version. Hope that helps.

           

          Rick

           

          [edit - for clarity]

          • 2. Re: Calibration?
            Ramón G Castañeda Level 4

            Just one addendum to Rick's thorough answer:

             

            Calibrate and profile your monitors often and regularly.

            • 3. Re: Calibration?
              TᴀW Adobe Community Professional & MVP

              Thank you Rick [and Ramon]. I'm going step by step in the "Help me calibrate my monitor" thread. I'm going to need all the help I can get!