EXCERPT page containing first few paragraphs. 2019-09-23 03:00:18
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This page uses a SpyderCHECKER® color checker card to evaluate the white balance and tint needed in mid-day sun for the Sigma 70mm f/2.8 DG Macro Art, using Photoshop/ACR raw file conversion.
The following process was followed to ensure the best possible neutrality of the grayscale (black to white) patches on the color card:
- Use click white balance as a starting point.
- Perform, twice, a 15 pixel Gaussian Blur. In Lab mode, check for neutral tint ('a' channel) and neutral color ('b' channel).
- Adjust color temperature and tint; repeat steps 2 and 3 until the best possible neutrality is achieved.
Evaluation: Mid-Day Sunlight, 500' elevation
An about $127 DataColor SpyderCHECKER was used for this evaluation. I use the clamshell version so I can safely carry it without damaging it. I do not use the calibration software as I have not been satisfied with the results versus the stock Adobe profiles.
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