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Is the colormap conversion of openCV linear? [closed]

asked 2014-09-23 16:57:59 -0500

rafaoc gravatar image

I have a gray scale image (i.e. 1 channel). I am using the opencv function applyColorMap() to improve the visualization. For example, if I have the code below

applyColorMap(imgGray, imgOut, COLORMAP_RAINBOW);

Somebody does know if the colormap conversion is linear?

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Closed for the following reason the question is answered, right answer was accepted by StevenPuttemans
close date 2014-09-29 04:01:37.739959

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The colormaps are based on the matlab colormap implementations. They follow the same behaviour. Afaik the relation is linear indeed.

StevenPuttemans gravatar imageStevenPuttemans ( 2014-09-24 01:56:17 -0500 )edit

Thanks @StevenPuttermans for your answer. May be do you have the reference where says the colormaps are based on opencv ?

rafaoc gravatar imagerafaoc ( 2014-09-24 08:10:16 -0500 )edit

Right here it clearly states in the top that it are GNU Octave/MATLAB equivalent mappings.

StevenPuttemans gravatar imageStevenPuttemans ( 2014-09-24 08:47:45 -0500 )edit

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answered 2014-09-25 18:04:23 -0500

rafaoc gravatar image

Thanks Steven. I found the answer and actually these colormaps used by applyColorMap() have a linear transformation ! link

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Asked: 2014-09-23 16:57:59 -0500

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Last updated: Sep 23 '14