Chris Cox wrote:

In article , Mike
Russell wrote:

Mike Engles wrote:
...
[re linear encoding of specialized pixel data values]

Is the same true for imaging from spacecraft, interplanetary or
otherwise or is gamma encoding done before transmission?

Yes. Gama encoding compresses some data values, and there is no reason to
do this to raw data from a spacecraft.

Here's an article that may interest you, by Alvy Ray Smith, on the
distinction of work and display color spaces.
http://alvyray.com/Memos/MemosMicros...rAlphaQuestion

Actually, Alvy has a number of mistakes in that paper.
I'm still not sure if he understands gamma encoding...

Chris


Hello

Yes there does seem to some confusion about PC Gamma, but he is
absolutly clear about the need for linear processing. As for not
understanding Gamma encoding, that is not clear from the article. He has
been around a long time, and does know a thing or two. If gamma encoding
were that important he would have mentioned it. He is totally clear
about not applying any non linearity to a image, just to the display
device. I assume from this he means the same for storage, but I don't
know.

Suffice to say that he and his collaborator are MAJOR digital graphics
imaging authorities who on the face of it supports Timo Autiokari's
lonely stance. His last words in the gamma article are telling.

Mike Engles