Re: How to calculate the Colordifference Delta E with ImageJ ?
Posted by Matzu Khan on Nov 18, 2014; 9:11pm
URL: http://imagej.273.s1.nabble.com/How-to-calculate-the-Colordifference-Delta-E-with-ImageJ-tp5009612p5010531.html
Hello Peter,
thanks for your support.
Basically I want to equalize the blue shift of an underwater lamp. With increasing light working distance longer wavelengths become extinct. My goal is to find a correlation between RED Power Increase of your Lightsource and Light Working Distance. I am using a hybrid Multi spectral LED Lightsource for this.
So, I try to characterize 2 Parameters:
This means
First I change the Illumination (which varies the color temperature) with increase RED, red yellow and amber and try to characterize the influence of the illumination with Delta E between the two kinds of illumination
Secondary I change Light working distance and try to characterize this influence with shift of DELTA E between same Color patch at different Light working distances
This means of course that I can not calibrate the Color patches values (I feel i dont need to because I only need relative values).
So far I have only made some dry Test pictures to establish my working process, but so far with not much result.
I have attached a Picture (jpg ) of 2 kinds of illumination (they have to much noise, but you can get the idea)
I know there are better ways to do that, especially since I do not use a calibrated camera, but still Lab seems like it would do the job.
If you have any better idea on how to do that I am very gratefull; I can however not change or expand my equipment.
Best Regards
Matzu
URL: http://imagej.273.s1.nabble.com/How-to-calculate-the-Colordifference-Delta-E-with-ImageJ-tp5009612p5010531.html
Hello Peter,
thanks for your support.
Basically I want to equalize the blue shift of an underwater lamp. With increasing light working distance longer wavelengths become extinct. My goal is to find a correlation between RED Power Increase of your Lightsource and Light Working Distance. I am using a hybrid Multi spectral LED Lightsource for this.
So, I try to characterize 2 Parameters:
This means
First I change the Illumination (which varies the color temperature) with increase RED, red yellow and amber and try to characterize the influence of the illumination with Delta E between the two kinds of illumination
Secondary I change Light working distance and try to characterize this influence with shift of DELTA E between same Color patch at different Light working distances
This means of course that I can not calibrate the Color patches values (I feel i dont need to because I only need relative values).
So far I have only made some dry Test pictures to establish my working process, but so far with not much result.
I have attached a Picture (jpg ) of 2 kinds of illumination (they have to much noise, but you can get the idea)
I know there are better ways to do that, especially since I do not use a calibrated camera, but still Lab seems like it would do the job.
If you have any better idea on how to do that I am very gratefull; I can however not change or expand my equipment.
Best Regards
Matzu
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