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I have old Kodak cards I must have bought 20 years ago, and I noticed the gray was a little warm.
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I would guess your old card has faded/changed color over the years.
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It's too bad we can't compare all our cameras side by side to see if they behave the same capturing the same scene.
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That would be a really interesting exercise Garth. If we all had a
color target or a
color chart (which I don't), or a printout of one from the same printer, we could take photos of the target under controlled lighting, white balance and camera setup conditions. Then upload the files straight to an ftp site (no editing in software programs). Then one could download them and view them in your own display software, which would yield information relative to your own software and color space settings, but interesting nonetheless. Assuming everyone's setup was indeed the same, any hue changes between images could be attributed to sensor calibration and/or different lenses.
Regards,
Holly