Please notice that this article series was started in 2002!
Back then digital cameras were few and far between, and film cameras, macrom lenses and scanning your flies in a flat bed scanner was the order of the day.
Today most people have a digital camera (or even a phone), which can do decent macro shots, and much of what you can read here is very out of date. But the general methods and advice still holds, and the articles should still be worth reading.
By Martin Joergensen (supported by Steve Schweitzer)

Print this chart and follow the instructions for calibrating your scanner or digital camera.

GFF’s Tips for Calibrating your Digital Camera or Scanner
  • Print out the above GFF Color Gradient & Grayscale Guide. Do not worry about the image quality of the guide. It was optimized to be the smallest in file size and still reproduce the critical elements of detail. The text edges will not be sharp like a camera-ready art piece. What is important is the color and grayscale reproduction.
  • Prepare a well-lit area if taking a digital photograph. Remember that incandescent lights emit a warm-yellow overtone while fluorescent lights emit a cooler-blue overtone. However, digital cameras do not interpret light the same way film-based cameras do. But for purposes of web-based imaging, the warm-yellow, cool-blue rule-of-thumb is generally applicable.
  • Take a digital photograph or scan the color guide.
  • Compare your digital take of the color guide for accuracy in the following areas:
     - Grayscale gradient capture (using the grayscale blocks)
     - Color block reproduction accuracy (using the color blocks & the rainbow color ramp)
     - Accuracy of detail (using the fly image) Look for accurate reproduction of the fly fur detail.
     - Accuracy of detail (using the color circular target). Look for clean separation of blues, reds and blacks.
     - Accuracy of color gradient blending (using the title words & the rainbow color ramp)
     - Accuracy of pure white reproduction and color bleeding (using the white background) Look for the thin white line between each color block.
  • After critically comparing your reproduction against the original, load your image in a photo-editor and touch up the image by adjusting hue, color balance, brightness and contrast. Memorize the final exact adjustments as these are generally the adjustments required by each image to bring it within tolerable realism of the original image.

Missed the intro...? This link will bring you there.

User comments
From: Andrew Foster · gfos1111·at·  Link
Submitted March 25th 2006

Thank you, the GFF Calibrate your digital camera was fatastic

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