images in cross-platform stacks

[Richard Gaskin]

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?

-- 
  Richard Gaskin
  Fourth World Media Corporation
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