So the remission spectra of all pigments get shaped (multiplied) by the spectrum of the incident light. This means, if your incident light contains nearly no blue light then the stone or whatever you want to examine will reflect only the fraction of "nearly no light" it typically does reflect of any amount of blue light. And the will reflect a well defined and individual proportion of each wavelength regardless the luminous flux of the incident light. This means they can only reflect wavelengths which are present in the incident light. Pigments are basically LTI-systems (aka passive filters). A piece of stone can only reflect incident light (except some uranium/radium salts, you don't want to deal with). Provided you do a proper calibration and add a calibratable light source. This said, I'm sure it will be possible to produce somewhat acceptable results with your sensor. And inbetween there are also lurking many error sources. Between a colored piece of stone and a numerical value normally lie a lot of transformations and convolutions. I will write on this later.Ĭolorimetry in fact is a complex matter.
Many of the best colorimetrists are colour blind." One second is: "Without light there is no colour". One is: "Because we all see colours we think measuring colous is an easy task. I know people working in this field for decades with equipment costing many millions of €. First of all colorimetry is a science on its own. If some one would be willing to help me that would be great!, I would like to keep the everything provided but change two things, I would like to convert RGB into Munsell using the data provided by the RIT link and also add a screen and button to start the read process and display the colour. My ultimate goal is to modify the colour view sketch here see: colorview I have all the data of what RGB ratio corresponds to each Munsell colour - which I have downloaded from this site: My problem is that when I use the sketch provided, I can not figure out how to use the "if" statement to "Serial.print" what the munsell colour corresponds to the RGB colour detected by the sensor. My idea is to use the Adafruit TCS34725 to read and detect the RGB colour of the sediment (in the RBG colour space) and convert the data into the Munsell System. The problem with doing this method is that it is highly subjective, and time consuming. The current conventional method is to use colour chips/swatches found in the Munsell system booklet and match them as close to examples of sediment/soil found at archaeological sites.
The idea I have is a simple device which can determine munsell colours with more accuracy and speed. I am hoping I could get some help developing a an idea I have for archaeologists/soil scientists using an arduino and the TCS3200 colour sensor.
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