[nikomat 22409] Another Ansel Adams legend

[Shin SUGIYAMA <ssugiya@biol1.bio.nagoya-u.ac.jp>]

すぎやま＠また NikonMF@yahoogroups.comからの引用です

グレーカードの反射率（18％）は印刷文章の複写の露出に最適化されているものだと 
信じていましたが
もっといい加減な理由で18％に決まったというお話です。
うーん、Ansel Adamsが登場すると神話の領域ですね！

quote:
During my work on the Gray Card update project last year I asked this
question to the folks at Kodak. There was only one man still at Kodak old
enough to remember the origin of the Gray Card and his answer when asked
why 18% was "Ansel Adams". According to him AA had reasons to want the
Gray Card to be 18%, reasons no one can remember, and came to Rochester
and spent a whole day and most of a night arguing about this. Finally
they agreed to make the card 18% just to get him to go away!
end-quote: