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From Feathers to Bits
By Martin
Joergensen (supported by Steve Schweitzer)
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Print this chart and follow the instructions for calibrating your scanner or digital camera.
GFF’s Tips
for Calibrating your Digital Camera or Scanner
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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.
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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.
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Take a digital photograph
or scan the color guide.
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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.
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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.
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