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Message: <blockquote data-quote="elkcub" data-source="post: 1381944" data-attributes="member: 14473">Henry/Ron/Ronh,It's difficult to simply subtract 6 units on the blue channel because the pixels vary within each area.  However, using M/S Word (of all things) I constructed a "table" with cells given RGB color values corresponding to my earlier post.  From there it was an easy matter to construct a second table in which each of the B-values was dropped by 6 points.  Visual differences are quite subtle.  (See attached .pdf and .jpg files.  The former is easier to read.)  I'm not completely sold that this manipulation is correct, because it assumes that the joint effect of the binoculars and camera is strictly additive.  If you are able to take color balance readings of the white card at different times of day, as Ron suggests, it might be possible to predict the RGB values seen through the binoculars if the assumption is correct.   Like Ron, I've also found very high consistency in the RGB readings across application programs.  There is a wonderful little tool called the "Art Director's Toolkit" that I would recommend for making instant color evaluation of the screen display, and also providing various conversions including CIE values, etc.   EdPS.  Correction: the B-value in the original background should read 227 not 226.   <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" /></blockquote>

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