[argyllcms] Re: how to connect a home made colorimeter to ArgyllCMS?

  • From: edmund ronald <edmundronald@xxxxxxxxx>
  • To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 19 Aug 2014 14:52:32 +0200

you can design a colorimeter with as set of switched illuminants and a
simple sensor. I think there was something called colormouse which has now
turned into the print version of spyder ...

On Tue, Aug 19, 2014 at 8:12 AM, Claas Bickeböller <lists@xxxxxxxxxxxxxxxxx>

> Hi,
> I wish you a lot of fun with your project but please do not expect
> anything accurate coming out of the sensor.
> Why? Maybe you want to start here
> http://johnthemathguy.blogspot.ch/2014/07/rgb-into-lab.html
> Best regards
> Claas
> Am 17.08.2014 um 21:54 schrieb Tom <chiataimakro@xxxxxx>:
> > hi,
> >
> > i am a student studying engineering at South China Agricultural
> University. i read a lot about CMS, both online and in libraries. I own a
> Huey and been using it with dispcalGUI/ArgyllCMS. of course i was shocked
> by it's speed and accuracy(to be honest, either was i out of luck, or be
> Huey has nothing to do with accuracy. a decomposition shows plastic film
> filters stacked together). later i purchased an i1 pro.
> > personally i d like to thanks Mr. Gill for his brilliant work on
> opensource color management software.
> >
> > now i am designing a colorimeter, as a hobby work, with a TCS34725 color
> light sensor from AMS(former TAOS). constant current led drive is
> implemented to provide stable illumination(even though it's a bad idea to
> use a colorimeter to measure the characteristics of reflective materials).
> >
> > the schematic work is partly done. well some decisions have to be made:
> >
> > 1) how can that little thing talk to argyllcms? i plan to use a USB-TTL
> chip for communications(native USB increase costs and complexes the
> software). it will open up a serial connection on windows, and return RGB
> measurement values on request. i can write an exe to communicate thru
> serial in .NET, but how could argyll make use of my exe? does argyll have
> some kind of measure to communicate with colorimetry devices that are not
> directly supported by the binaries? like loading a custom dll, or making a
> tcp request to some port? or do i have to provide you with a datasheet of
> the device, and the device itself, in order to let you write some code
> about it?
> >
> > i am not very familiar with native windows C programming(with serial
> communication and all those api stuff), nor do i have much experience to
> code in a pro style like argyll. for me it could be a fun of trial and
> error, or it could be a waste of time.
> >
> > 2) what USB-TTL(serial) chip should i choose, to avoid trouble for linux
> users?
> > i myself is a dedicated windows user. but i want my work to be useful
> for everyone. here in china a lot of options are available:
> >
> > FTDI FT232 : stable, known to work with linux, expensive
> > Prolific PL2303 : full of fake chips, known to work with linux,
> extremely cheap, limited speed(115200 baud rate max).
> > WCH CH-340 : Chinese Mainland brand, Windows driver provided, extremely
> cheap, easy to solder package(SOP16), 1M baud rate stable.
> >
> > 3) a question: if the filters built inside an RGB sensor have exactly
> the same spectrum sensitivity characteristics to the LMS sensitivities of
> human eye, can i obtain accurate XYZ readings from it?
> >
> > Greetings from far east,
> > Qin Yongliang

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