Question: CSV files from spectra

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Dr_Z asked on December 27, 2017 03:52
171 | 1 answers | #15436


What are the units in the CSV files? The wavelengths are provided in the far left, but the values for the blue, green, and red peaks are different from the %intensity that can be obtained from scrolling along the spectra graphs with the mouse. The values are over 100, so it doesn't appear to be the % transmittance. The values are also too high for absorbance. Could someone please clarify for me? Thank you.



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1 Answers

They are the RGB image data pixel values, from 0-255. And note that due to image processing, noise, etc, this may not directly correspond to absorbance values!


So I take it the percentages that come from scrolling along the graph are the ratio of the data pixel values to the max of 255, correct?

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That's right! We thought 0-100 would be more familiar to people, but the original values are preserved in the raw data.


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