More screengamma

Richard Gaskin ambassador at
Tue May 6 09:01:32 EDT 2014

J. Landman Gay wrote:

> On 5/5/14, 5:39 PM, Scott Rossi wrote:
>> On my Mac system, the PNG image at the top appears darker than the JPEG
>> below.  When the slider is adjusted, only the top image is affected (LC
>> 6.6.1, OSX 10.8.5)
>> Are you seeing something different?
> Well, I was screensharing when I saw it. I told the client how to set
> the gamma from the message box and we both saw it change. Now neither of
> us can do it. Maybe the card we were looking at happened to have a png
> on it instead of a jpg; the stacks have hundreds of imported images so
> it's possible they aren't all the same.
> So if the gamma isn't the problem, do you know why the images would look
> different on different platforms, and between stacks and standalones?
> Here's what the client said:
> "right now, you can't see any background at all on Windows; when you
> make it so that it can be seen on Windows, it's way too dark on Mac"
> I think the change she's talking about is when we were setting the
> screengamma. If not, then I'm not sure what she did to "make it so it
> can be seen." I'll find out, but if you have any ideas I'd love to hear
> them.

It shouldn't be that hard.  It's nice that we have the ability to adjust 
a PNG's gamma, but that's really an extra and fiddling with it should 
not be a requirement.  By default PNGs should just be imported with the 
correct colors.

I recently added a comment to this bug report, and hopefully it'll be 
addressed soon:


  Richard Gaskin
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