On May 16, 2006, at 8:47 PM, Richard Gaskin wrote:
Phil Davis wrote:
What happened was the screenGamma, since my image is a PNG file.
Rev's screenGamma is a color? or brightness? or ??? adjustment
factor applied only to PNG files. The screenGamma defaults are
1.7 for Mac and 2.2 for Windows. (I don't know what they are for
Linux.)
I then used a graphics tool to convert it to JPG, and re-imported
it into a Rev stack. The new image object's color is 145,145,145.
Cause identified!
While the cause is identified, I'm unable to identify the logic
behind it.
Screen gamma is a function of display, not file format.
GraphicConverter doesn't shift the colors when it displays PNGs.
Rev doesn't alter the display of JPEGs or GIFs -- why single out
PNGs in this way, and why try to adjust for screen gamma when the
screen is already doing anything that needs to be done there?
This is a question that goes way back to the good Dr. Raney. I
remember having a discussion with him about it. The details are
fuzzy, but they went something like this: That is the way it is.
Mark Talluto
--
CANELA Software
http://www.canelasoftware.com
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