<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"> <html><head><meta name="qrichtext" content="1" /><style type="text/css"> p, li { white-space: pre-wrap; } </style></head><body style=" font-family:'DejaVu Sans'; font-size:12pt; font-weight:400; font-style:normal;"> On Monday, March 07, 2011 02:39:13 PM edmund ronald wrote: > compelled - hah! :) > and what instrument do you expect your average Taiwan corp will use to > measure the primaries ? > not only that, but my experiments a year ago indicated that many > laptops cannot get the EDID data from an attached monitor under > Windows, because the driver has not implemented this data channel. I > don't know how it is with Linux. This is also the case on X11 systems at least for some drivers/hardware. > > Edmund > > On Mon, Mar 7, 2011 at 10:56 PM, Chris Murphy <lists@colorremedies.com> wrote: > > Historically that has been expensive. At least if the filters are both > > accurate and consistent unit to unit. My preference is that > > manufacturers be compelled, one way or another, to insert the correct > > information in EDID. And then users don't have to deal with it at all. > > > > We do have the small problem of backlight decay over time. > > > > Chris > > > > On Mar 7, 2011, at 2:33 PM, edmund ronald wrote: > >> Chris, > >> > >> As usual, you have hit the nail on the head, colorimeters are not > >> going to be much fun when the primaries are spiky and unknown. > >> I knew this when I did my colorimeter design. > >> But I think a low-cost spectro will not be very happy with spiky LEDs > >> either. I think the only really reliable way to measure a color LED > >> backlight panel is probably a really good high-end filter instrument.. > >> There is an ex-east german company which I believe has an accessible > >> colorimeter with "real cone" RGB filters. > >> > >> > >> Edmund > >> > >> On Mon, Mar 7, 2011 at 9:51 PM, Chris Murphy <lists@colorremedies.com> wrote: > >>> I wish a grant were possible to determine the accuracy of EDID primary > >>> information. With display technologies all over the map, a colorimeter > >>> is ill equipped to do a good job all of the time due to mismatching > >>> primaries to the color matrix in the colorimeter (or its software). I > >>> am presently unconvinced that most people need a colorimeter in this > >>> category. It really takes a spectro to be sure. I have seen > >>> colorimeters, including the Huey, do a worse job than default EDID > >>> based profiles, with common displays. > >>> > >>> Chris Murphy > >>> > >>> On Mar 7, 2011, at 2:24 AM, Richard Hughes wrote: > >>>> On 7 March 2011 09:14, edmund ronald <edmundronald@gmail.com> wrote: > >>>>> Of course I didn't :) > >>>> > >>>> Heh :) > >>>> > >>>>> However the technology and calibration issues are the same as with > >>>>> any colorimeter; I wouldn't expect any surprises, other than the > >>>>> perennial matrix issues. In fact, I would expect my design to > >>>>> perform better than Huey, which at the time I did this was the > >>>>> low-cost instrument to beat. > >>>> > >>>> Right, and I guess the Huey is still the low cost instrument to beat. > >>>> It's certainly what I advise people who ask to buy. > >>>> > >>>>> My guess is that the technology I used was intended for, and will be > >>>>> or is found in some self-calibrating screens, where of course the > >>>>> calibration issues can be solved at manufacture time, and later by > >>>>> remeasuring with a spectro. > >>>> > >>>> I guess if someone was to manufacture the devices in small quantity > >>>> they should just calibrate them at manufacture time with something > >>>> like a ColorMunki. I assumed you wanted to post the PCB and BOM online > >>>> and let people make their own colorimeter, open source style. > >>>> > >>>>> I should stress that I did the hardware design myself, and had some > >>>>> protos fabricated, and wrote the Mac instrument drivers, I did not > >>>>> write full calibration software. > >>>> > >>>> Right. It sounds like you could commercialize this and make a bit of > >>>> pocket money, on the assumption you can undercut the huey by a > >>>> significant enough margin for production volumes < 1000 or so. That's > >>>> the tricky bit. > >>>> > >>>> Richard. > >>>> _______________________________________________ > >>>> openicc mailing list > >>>> openicc@lists.freedesktop.org > >>>> http://lists.freedesktop.org/mailman/listinfo/openicc > >>> > >>> _______________________________________________ > >>> openicc mailing list > >>> openicc@lists.freedesktop.org > >>> http://lists.freedesktop.org/mailman/listinfo/openicc > > > > _______________________________________________ > > openicc mailing list > > openicc@lists.freedesktop.org > > http://lists.freedesktop.org/mailman/listinfo/openicc > > _______________________________________________ > openicc mailing list > openicc@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/openicc </body></html>