Aug 162013

Digital Wildlife Photography.
John and Barbara Gerlach.

Many cameras offer a second and superior form of histogram. It’s called an “RGB” histogram and it separately displays the histograms of each of the three color channels superimposed onto one image. The separate color data eliminates the subtle errors of the green favoring luminous histogram. Barbara and I use RGB histograms exclusively, and every year we teach hundreds of our students to do the same to achieve fabulous exposures. If you’re buying a new camera, be sure to look for this very important feature. The RGB histogram is always the camera’s most accurate means of evaluating your exposures. We will say more about histograms in Chapter 3.

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I have always set up my camera to display the single larger luminous histogram and not the RGB histogram. The author makes a great case for using the RGB histogram instead of the luminous histogram and I have changed the settings on my camera to make this my default.

Book Posts

  • Digital Wildlife Photography by John and Barbara Gerlach
  • RGB Histogram vs Luminous Histogram

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    Jun 112012

    Manual for the Canon 60D

    A mystery solved. Filenames on Canon EOS cameras, like the T2i, 60D, 7D, etc all use the pattern IMG_xxxx.JPG or IMG_xxxx.CR2. One day I noticed all the filenames on my Canon T2i started with an underscore replacing the ‘I’, so they started with ‘_MG_xxxx’. I didn’t know what I had done but wasn’t worried cause it helped distinguish them from the photos from my Canon 60D.

    Today I found the answer while browsing the user’s manual for my camera (oh the horror!).

    If the image is captured with the color space set to Adobe RGB, the file name will start with “_MG_” (first character is an underscore).
    Yep, I had changed the color space on my camera to Adobe RGB from the default sRGB one night and forgot. Since I shoot almost exclusively RAW, and color space only affects JPG images, I never noticed the difference.

    For now I will go back and set it the sRGB. I know Adobe RGB is ‘better’ quality but not all browsers are smart enough to display Adobe RGB files correctly, and the only reason I would shoot JPG is so that I don’t have to process the image.

    Hope this helps someone else’s quandary!