Interestingly enough . . . my Pentium 4 running Ubuntu 11.04 has a
screen gamma of 2.2 . . .
So, I can only conclude, that while Apple's bye-line may be "Think
Different",
as Lion begins to look like something halfway between GNOME 3 and UNITY,
and Snow Leopard sets a screen gamma to 2.2, the real thinking is not so
much "different" as conformist.
On 07/02/2011 01:33 AM, Devin Asay wrote:
Hi all,
About a year and a half ago Scott Rossi posted this useful tip:
This might be useful for folks delivering image-heavy apps on Mac OS X 10.6
and later...
Apparently with Snow Leopard, Apple has changed the default gamma of the
system to 2.2 (used to be 1.8).
<http://blogs.adobe.com/jnack/2009/09/why_your_web_content_will_look_darker.
html>
I was recently throwing some PNG images on a card on Rev that looked
significantly darker than where they were created (in Photoshop), and for
the life of me could not figure out why. I'm still searching for a reliable
way to strip the gamma information from PNG images, but after finding the
above article, I tried changing the screenGamma in Rev to 2.2 and amazingly
(or maybe expectedly) the image seems to display properly.
set the screenGamma to 2.2
I have just set up a merry little stack that can set the screen gamma
from 2.2
to 1.8 and back again [rocket science it ain't]. It sports 4 open source PNG
images; now, reading this posting I would expect the appearance of those
PNGs
to change a spot when I set the screenGamma; but they don't seem to [at
least
on Linux]: LC 4.5.
Download it and play with it:
http://andregarzia.on-rev.com/richmond/STUFF/gamma.rev
My PPC macMini returns a screen gamma of 1.7 (mainly because I've been
bu**ering around with the Mac to suit my needs); agin, setting the SG to 2.2
results in nothing: LC 4.5.
Ar-har-har! When I open the same stack under LC/RR 4.0, having,
supposedly, set the SG to 2.2 when it was open in LC 4.5 it reports the
SG as 1.7. So the screen gamma Dinge-an-sich is NOT reset.
Doing the "put the image into itself" THANG [click on button 'THANG']
crashes
4.0 (Mac PPC), on 4.5 (Mac PPC) one of the images vanishes, and on Linux
all the
images vanish.
Joy, joy, oh, complete, unmitigated joy . . . :(
I need to do some more testing, but it appears that when delivering apps on
Snow Leopard that make heavy use of PNGs, one will need to do something to
the effect of:
if "mac" is in platform() and systemVersion()> 10.5 then ...
Also used the following method to force refresh the display of the image:
set text of img 1 to text of img 1
Hope this saves some head banging for other folks using images.
Regards,
Scott Rossi
Creative Director
Tactile Media, UX Design
Just now, I've run into this exact same problem. I tried applying Scott's
workaround, only to discover that it only works with Revolution 4.0 and
earlier. Any time I try to display these same PNGs in LiveCode 4.5 or higher
they come out significantly darker, regardless of whether I reset the
screenGamma. Oddly, PNGs that were originally produced in OS X 10.5 do not come
out darker, so it definitely has something to do with 10.6. Only the latest
versions of LC don't allow me to correct the problem any more.
Has anyone run into this, and has anyone found a solution?
Regards,
Devin
Devin Asay
Humanities Technology and Research Support Center
Brigham Young University
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