[Openicc] [argyllcms] Re: Helping with colord

[edmund ronald]

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 at 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 at 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.
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