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

  • From: "Tom" <chiataimakro@xxxxxx>
  • To: "argyllcms" <argyllcms@xxxxxxxxxxxxx>
  • Date: Wed, 20 Aug 2014 00:24:43 +0800

Gill wrote: >It's quite difficult to transform a colorimetric reading using one 
>particular light source (i.e. a white LED) into one for a standard >light 
source such as D50 in a way that is independent of the >spectral 
characteristics of what you are measuring. Reflective >colorimeters have 
traditionally used an incandescent light source, >because it has some 
similarity to D50, or can be filtered to be like D50. that's true. the 
colorimeter is mainly designed for emissive(display) measurement, with 
reflective measurement as an extra option.the colors rendered under a white LED 
will not match a D50 source for sure. i read papers about synthesizing D50 and 
D65 spectrum with an array of 8-12 LEDs of different wavelengths and types(with 
phosphor or not), which can be a good alternative to incandescent lamps. i ll 
try to build one later. thanks for the advice!with a white LED the colorimeter 
may be used to QC products with the same type of surface material, in a way 
where the absolute color of a sample is not important, but the deviations 
between samples.>Short answer: you would have to write a driver. There are 
numerous examples, >from the simple to complex in the ArgyllCMS spectro/ source 
(i.e. ColorHug,  >Huey, DTP51, etc). i tried my best to read your source code. 
it may take a while for me to figure out what every function does.i will give 
it a try on Visual Stuidio 2012. ---------------------------Love you all,Qin 

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