Hi Graeme, I just don't get that behavior unfortunately. Here's an exact transcript of what happens: robin1:robin geoff$ /mnt/pooh/Mac/usr/local/Argyll_V1.3.3/bin/dispcal -v -g 1 -yl -d 2 test Setting up the instrument Place instrument on test window. Hit Esc or Q to give up, any other key to continue: Display type is LCD Target white = native white point Target white brightness = native brightness Target black brightness = native brightness Target advertised gamma = 1.000000 Display adjustment menu: Press 1 .. 7 1) Black level (CRT: Offset/Brightness) 2) White point (Color temperature, R,G,B, Gain/Contrast) 3) White level (CRT: Gain/Contrast, LCD: Brightness/Backlight) 4) Black point (R,G,B, Offset/Brightness) 5) Check all 6) Measure and set ambient for viewing condition adjustment 7) Continue on to calibration 8) Exit Commencing device calibration patch 6 of 6 Black = XYZ 0.50 0.51 0.84 Red = XYZ 102.89 53.72 4.48 Green = XYZ 61.26 126.60 21.26 Blue = XYZ 29.90 12.43 159.21 White = XYZ 198.24 196.63 188.02 patch 64 of 64 Initial native brightness target = 196.629329 cd/m^2 Target white value is XYZ 198.235527 196.629329 188.021633 Adjusted target black XYZ 0.50 0.49 0.84, Lab 2.24 0.15 -3.12 Target black after min adjust: XYZ 0.499 0.488 0.843, Lab 2.240 0.148 -3.119 Gamma curve input offset = 0.000000, output offset = 0.002480, power = 1.003591 Total Iteration 3, Final Samples = 64 Final Repeat threshold = 0.600000 Creating initial calibration curves... Doing iteration 1 with 16 sample points and repeat threshold of 1.200000 DE patch 16 of 16 Brightness error = 0.000000 cd/m^2 (is 196.434849, should be 196.434849) White point error = 0.000000 deltaE Maximum neutral error (@ 0.895486) = 1.166039 deltaE Average neutral error = 0.813299 deltaE Number of measurements taken = 36 Computing update to calibration curves... Doing iteration 2 with 32 sample points and repeat threshold of 0.848528 DE patch 32 of 32 Brightness error = 0.000000 cd/m^2 (is 196.358199, should be 196.358199) White point error = 0.000000 deltaE Maximum neutral error (@ 0.419042) = 0.838664 deltaE Average neutral error = 0.537847 deltaE Number of measurements taken = 101 Computing update to calibration curves... Doing iteration 3 with 64 sample points and repeat threshold of 0.600000 DE patch 64 of 64 Brightness error = 0.000000 cd/m^2 (is 196.459265, should be 196.459265) White point error = 0.000000 deltaE Maximum neutral error (@ 0.023233) = 1.504637 deltaE Average neutral error = 0.490073 deltaE Failed to meet target 0.600000 delta E, got worst case 1.272785 Number of measurements taken = 385 The instrument can be removed from the screen. Written calibration file 'test.cal' robin1:robin geoff$ /mnt/pooh/Mac/usr/local/Argyll_V1.3.3/bin/dispwin -d 2 test.cal robin1:robin geoff$ /mnt/pooh/Mac/usr/local/Argyll_V1.3.3/bin/dispcal -d 2 -yl -r Place instrument on test window. Hit Esc or Q to give up, any other key to continue: Current calibration response: Black level = 0.48 cd/m^2 White level = 196.73 cd/m^2 Aprox. gamma = 2.30 Contrast ratio = 414:1 White chromaticity coordinates 0.3401, 0.3372 White Correlated Color Temperature = 5160K, DE 2K to locus = 7.3 White Correlated Daylight Temperature = 5155K, DE 2K to locus = 10.8 White Visual Color Temperature = 5354K, DE 2K to locus = 7.0 White Visual Daylight Temperature = 5473K, DE 2K to locus = 10.3 The instrument can be removed from the screen. Gamma of 2.2 verified with spotread: White Yxy: 196.703246 0.340368 0.337594 Black Yxy: 0.829925 0.307911 0.290062 Gray Yxy: 47.263913 0.348618 0.335558 On Wed, Jul 6, 2011 at 9:51 PM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote: > Geoff Ghose wrote: > >> Yes, it's OS X. After creating the calibration, I install it. >> > > I don't seem to be able to reproduce such a problem using > the Huey on the MacBook running 10.4: > > dispcal -v -g 1 -yl test > dispwin test.cal > dispcal -yl -r > Approximate gamma 1.01 > > spotread returns: > > White Y = 179.1 > 50% Y = 89.05 > Black Y = 1.69 > > so the expected 50% value would be (179.1 + 1.69)/2 = 90.4, > which is reasonably close. > > You'll need to try and figure out why it isn't working > on your machine. I note that the display visibly brightens when > the calibration is installed. Do you see that too ? > > Graeme Gill. > >