images in cross-platform stacks

Tereza Snyder tereza at
Wed May 17 00:51:10 EDT 2006

On May 16, 2006, at 10:47 PM, Richard Gaskin wrote:

> 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?

and Mark Talluto wrote:

> 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.

I seem to remember something too in the dim past. PNGs, I know,  
contain gamma info in their headers in contrast to JPEGs, which may  
not. The info is used by rev to display consistent gamma cross-platform.

In the present, I take advantage of it because it shows, on the Mac,  
the gamma I can expect in Windows. My applications are wall-to-wall  
images. I use FireWorks to make most of my images and set it to  
display Windows gamma. I achieve better control over contrast because  
I see what (most of) the end users will get.

It's on purpose!


Tereza Snyder

    Califex Software, Inc.
    800 Water Street
    Sauk City, WI 53583
    AIM: terezasnyder1

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