AW: need some RGB bug tester

[Tiemo Hollmann TB]

Thanks for testing, it gave me some confidence in the difference.
Some more tests, I found that there are some images which show this
difference and others, which show exactly the same value on Win/Mac. So it
must be something dependent of the image. In my test case a JPG without
embedded color profile showed the same values and another JPG with embedded
sRGB color profil showed the different values. I don't know if this is
related to the issue or if my results showed just by accident. The profile
theory wouldn't explain my original issue, where I take a screenshot of the
same video in LC and take the color of that screenshot. In that case the
profile or non profile of the screenahot should be the same on Win / Mac.

For my issue I will go on with adding + 30 to the Mac RGB values to get a
comparable value as on Win, though the difference is in 98% of the cases 30
+/- 3 and in a few cases more than that. It's not a nice workaround but
hopefully close enough for me.

If anybody has more insight, every hint is welcome.

Tiemo


 -Ursprüngliche Nachricht-
 Von: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] Im
Auftrag
 von Dave Kilroy
 Gesendet: Montag, 15. September 2014 13:45
 An: use-revolut...@lists.runrev.com
 Betreff: Re: need some RGB bug tester
 
 Hi Tiemo
 
 On Windows 7 I get 99,150,200 with LC 6.6.2 and LC 7.0.0(rc1) - and on
 Mavericks I get 82,130,188 with LC 6.6.3 and LC 7.0.0(rc1) - please note
both
 tests with LC 7.0.0 used bytetonum instead of chartonum
 
 So it increasingly looks like it is OS related issue...
 
 Dave
 
 
 
 -
 Some are born coders, some achieve coding, and some have coding thrust
upon
 them. - William Shakespeare  Hugh Senior
 
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 View this message in context: http://runtime-
 revolution.278305.n4.nabble.com/need-some-RGB-bug-tester-
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 Sent from the Revolution - User mailing list archive at Nabble.com.
 
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AW: need some RGB bug tester

[Tiemo Hollmann TB]

The screengamma does only affect PNGs, but my issue appears the same with
JPGs and setting the screengamma depending on the platform didn't changed my
results.
Bernd and Dave got the same results with LC 7 and byteToNum as me on LC
6.5.5 and charToNum.
Tiemo

 -Ursprüngliche Nachricht-
 Von: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] Im
Auftrag
 von J. Landman Gay
 Gesendet: Montag, 15. September 2014 18:46
 An: How to use LiveCode
 Betreff: Re: need some RGB bug tester
 
 This is due to the different screen gamma settings on Mac.  It affects the
 appearance but doesn't change the actual bitmap data.  The screen gamma
can be
 set by the. user, and the default setting on Mac is different from the
default
 on Windows.
 
 I had thought it was the gamma setting that was causing the problem but
now I
 think Bernd is right and byteToChar is the answer.
 
 On September 15, 2014 6:29:17 AM CDT, Matthias Rebbe | M-R-D
 matthias_livecode_150...@m-r-d.de wrote:
 
 If i use the loupe of the Color selection dialog on Mac and select the
 image in Browser i can see values similar to the ones you can see on
 Windows. Doing the same with the LC image i can see values similar to
 the ones LC is reporting back.
 So LC is seems to change the image in some way on Mac OS X
 --
 Jacqueline Landman Gay | jac...@hyperactivesw.com
 HyperActive Software   | http://www.hyperactivesw.com
 
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