Some discussion about judging shades of gray prompted me to overlay a Kodak
grayscale chart onto John's comparison shot with the 3rd year herring gull.
You can see this here:
http://www.flickr.com/photos/haans42/
Then use the chart on pp 26 of Howell and Dunn. If the Herring gull looks
lighter than the values on the H&D chart shift everything the same amount
lighter. If darker shift everything in that direction.
To me the result matches what I thought I saw in the field Saturday.
Hope everyone is having a great holiday. Briskett on BBQ and time to kill
while it cooks
Haans
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