on 21-11-2002 23:50, giorgio gomelsky at email@hidden wrote:
> Could someone be so kind and give us an overview of the Gamma Factor?
> I noticed considerable playback differences in brightness/contrast
> between platforms (and monitors!) - Win always darker than Mac.
>
> What kind of compromise can one achieve, at what stage of the encoding
> process and how? Can one alter video settings (using QT video controls
> for instance) AFTER encoding, and are these passed on to the rtsp
> function?
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Hi Giorgio,
Think about Gamma as the average luminosity of the monitor screen.
In theory Mac systems have a gamma of 1.8 and Windows at 2.2, that is
considerably darker (2.2 is also the broadcast gamma).
But in practice i've found the enormous amount of chip monitors used mostly
on windows systems set to a gamma of about 2.5 and with a lot of contrast
which decreese the luminosity even more. Not to mention how often those
devices are completely out of calibration.
The best is to set the gamma at 2.2 and publish a gray scale with the advise
for the navigator to check that all the steps are visible.
Something like the video bars but much more usefull on the web.
Gianni
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References:
>Gamma Factor (From: giorgio gomelsky <email@hidden>)
