LAB color mode

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NikonUser
Posts: 2693
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

LAB color mode

Post by NikonUser »

I purposely oversharpen (USM) my moth dissection images to show better detail. Doing so in RGB mode often changes colours giving weird effects, as sharpening affects both edges and colours.
Temporarily converting an RGB image to LAB and selecting the L channel before USM results in sharpening only edges, colours not affected as they are in the a and b channels.
Does seem to give a 'better' final image.

the above is my interpretation of what I have read; just as likely to be incorrect as correct.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

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Olympus microscope and objectives

iconoclastica
Posts: 486
Joined: Sat Jun 25, 2016 12:34 pm
Location: Wageningen, Gelderland

Post by iconoclastica »

In lab, tone (brightness) is decoupled from hue, contrary to rgb, where you 'add more colour' to increase the lightness. For this reason sharpening on the l-channel in lab often gives better results than sharpening in rgb. Also colour corrections tend to be more precise. Find more about this in Dan Margulis' book.
--- felix filicis ---

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