Dynamic Range of image
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Hello guys,
I am really lost on this. Please could someone let me know how could I initiate the plotting of dynamic range of RGB image which will be something similar to this one: http://tinypic.com/view.php?pic=1zexhqs&s=8#.UxGskPldWT8
I really have no idea where to start and so a small push would be very much appreciated.
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Answers (1)
Image Analyst
on 1 Mar 2014
You have to image something of known percent reflectances, like the x-rite Color Checker chart or similar kinds of gray scale step wedges. Then measure the gray level of each step and plot it versus the "true" value.
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Image Analyst
on 31 Dec 2020
Edited: Image Analyst
on 31 Dec 2020
Like I said in the original answer you have to use known, true, ground truth reflectance values. These values are supplied in the data sheet that comes with the Color Checker chart, or you can measure them yourself with a trusted instrument such as a calibrated spectrophotometer or colorimeter.
See attached tutorial.
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