Roger Breton wrote:
I am not sure I successfully completed the calibration of my LCD display with V0.70 dispcal since, towards patch 60 of 100, in the verification pass, I got a nice "dispcal.exe has encountered a problem and needs to close" run-time error?
See below. It sounds like two copies of dispwin were started. One ran, the other aborted. I've not run it on WinXP (I don't have a WinXP test system at the moment), so It's not clear how two copies of the software were started. Do you think you might have done this accidentally ?
Setting up the instrument Instrument Type: Eye-One Pro Serial Number: 102242
So far so good. Now, what I don't understand is why did the program went through a second round of instrument calibration below?
Seems like a second instance of dispcal was being run.
Setting up the instrument Instrument Type: Eye-One Pro
Was it the result of some of the arguments I used on my command-line?
Display adjustment menu: Press 1 .. 7 1) Black level (CRT: Brightness) 3) White level (CRT: Contrast, LCD: Brightness) 4) Black point (R,G,B, Offset) 5) Check all 6) Continue on to calibration 7) Exit
Here, I admit I didn't quite knew what I was doing when I pressed "5". What confused me was the text in bracket for each choice. For example, for Black level, I wasn't sure what this test would do for an LCD display, since it showed CRT: Brightness in bracket. I guess what you mean to say, in bracket, is "for a CRT monitor this relates to the Brightness knob".
Yes, the information in brackets is the control the adjustment relates to. > When I take the
time to read through your reported measurements things start to make sense however. Maybe a better term for brightness would be Luminance? Because that's the units into which dispcal is reporting brightness?
That's not what the controls are labelled though, so that would be very confusing for users. On a CRT, the "Brightness" control is the one that has the greatest influence on black level. LCD's don't have any direct controls for black level, so (naturally), there's no effective way of adjusting this. That's little to do with dispcal, and a lot to do with the display technology, and what the user is going to ask it to do.
Doing verify pass with 100 sample points patch 100 of 100 Verification results: Brightness error = -1.507341 cd/m^2 White point error = 0.241024 deltaE Maximum neutral error (@ 0.314318) = 66.765037 deltaE Average neutral error = 5.135653 deltaE
Hmm. It's usual for the verification to indicate a worse result than the last calibration pass, but I've never seen anything like this. it's way off. Perhaps this is a result of two copies of the program running at the same time, and overlapping/competing ? Graeme Gill.