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Setting custom WB via grey card

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  • Setting custom WB via grey card

    So I'm trying to set a custom (one touch) WB using a grey card, and the EM-10 is having none of it.

    This is my newly-IR-converted EM-10, with which I'm now experimenting. Apparently for this particular IR filter, WB on a grey card is recommended, but I can't get the camera to 'take' it. All I get is the "X WB no good" message.

    The card was in bright sunlight; I've tried over-exposing by 1, 2, 3, 4 and 5 stops (the maximum, it seems); I've upped the ISO; I have the aperture wide open at f2.8. Still, it doesn't want to know.

    I've successfully done the WB on a white card, and on green grass, so the system does work ... just not with grey.

    Any suggestions, anyone?

    Or am I doomed to have to carry and include a grey card in every shot I ever take?
    Margaret

    my Website ; my Flickr ; my Facebook

  • #2
    Re: Setting custom WB via grey card

    At what wavelength range does the converted camera operate?
    I suspect it's what's termed 'near IR'. IR is sensitive to temperature, isn't it?
    Steve

    on flickr

    Comment


    • #3
      Re: Setting custom WB via grey card

      It's a 590nm filter. Other than obviously not being 'visible light' I have no idea how that impacts anything in terms of settings.
      Margaret

      my Website ; my Flickr ; my Facebook

      Comment


      • #4
        Re: Setting custom WB via grey card

        There are several Inks & Dyes that absorb near IR while appearing to produce the required colour in "daylight".

        They are used a lot in ID cards where scanners can see hidden patterns using IR light.

        You may have a grey card that absorbs IR making it look black to the sensor

        http://www.hwsands.com/category/26.aspx
        Graham

        We often repeat the mistakes we most enjoy...

        Comment


        • #5
          Re: Setting custom WB via grey card

          You could always ask about something like these as they are plastic.

          http://www.7dayshop.com/products/7da...gc-b-7DSMQDG-B
          Graham

          We often repeat the mistakes we most enjoy...

          Comment


          • #6
            Re: Setting custom WB via grey card

            Originally posted by Graham_of_Rainham View Post
            You could always ask about something like these as they are plastic.

            http://www.7dayshop.com/products/7da...gc-b-7DSMQDG-B
            Thanks Graham. I was looking at something similar
            Margaret

            my Website ; my Flickr ; my Facebook

            Comment


            • #7
              Re: Setting custom WB via grey card

              This looked "interesting" and may be of some use.

              http://www.davidclapp.co.uk/blog/vie...s-in-lightroom
              Graham

              We often repeat the mistakes we most enjoy...

              Comment


              • #8
                Re: Setting custom WB via grey card

                Hi Margaret. To set custom WB on my E-5 I have to use a white target, not a grey card. If it doesn't find white I get a fail message that may be similar to yours. I know you have tried using a white source, did you test the custom WB with your filter afterwards to see how it looked? I find that regardless of using a custom WB with my 8 stop ND I still require further manipulation in LR to correct the colour.
                Steve

                E-M1 Mk II, E-5, E-510, 9-18mm f4-5.6, 14-54mm f2.8-3.5 II, 50-200mm f2.8-3.5 SWD, 5omm f2, EC-14, 14-42mm, 40-150mm, Velbon GEO E640L/PHD64Q, METZ 48 AF-1

                http://www.flickr.com/photos/stoates/

                Comment


                • #9
                  Re: Setting custom WB via grey card

                  On my IR converted camera I use an area of green grass to set the custom white balance.

                  Then I use Olympus Viewer software for the initial conversion as, unlike Lightroom, Olympus Viewer can read the custom white balance setting.

                  Comment


                  • #10
                    Re: Setting custom WB via grey card

                    Originally posted by stoates View Post
                    Hi Margaret. To set custom WB on my E-5 I have to use a white target, not a grey card. If it doesn't find white I get a fail message that may be similar to yours. I know you have tried using a white source, did you test the custom WB with your filter afterwards to see how it looked? I find that regardless of using a custom WB with my 8 stop ND I still require further manipulation in LR to correct the colour.
                    Yes, neither the white WB nor the green WB is giving me what I think it should look like, at least according to the sample images from this filter on the conversion company website. I did anticipate further work in LR, and/or even a custom DNG profile, but I do want to try and get the WB as good as possible to start from, and I just feel I'm not there yet. Further messing about to be tried yet..
                    Margaret

                    my Website ; my Flickr ; my Facebook

                    Comment


                    • #11
                      Re: Setting custom WB via grey card

                      Originally posted by Invicta View Post
                      On my IR converted camera I use an area of green grass to set the custom white balance.

                      Then I use Olympus Viewer software for the initial conversion as, unlike Lightroom, Olympus Viewer can read the custom white balance setting.
                      Margaret

                      my Website ; my Flickr ; my Facebook

                      Comment

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