[argyllcms] Re: how to connect a home made colorimeter to ArgyllCMS?
- From: Claas Bickeböller <lists@xxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 19 Aug 2014 08:12:28 +0200
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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