Jet colormap to grayscale

Guillaume CALMETTES guillaume.calmettes at gmail.com
Fri Nov 23 12:48:14 EST 2012


Hi Johannes,

Thanks, I'll try!

Guillaume


On Nov 23, 2012, at 9:39 AM, Schönberger Johannes <hannesschoenberger at gmail.com> wrote:

> Hi,
> 
> this might be a way to achieve this:
> 
> 1. create jet colormap
> 2. convert color map to HSV-space and sort according to hue
> 3. use sorted jet color map as lookup table / colormap for image
> 
> I hope this helps.
> 
> Johannes Schönberger
> 
> Am 23.11.2012 um 05:08 schrieb Guillaume CALMETTES <guillaume.calmettes at gmail.com>:
> 
>> Hello,
>> 
>> I am looking to convert an image saved with the jet colormap to grayscale.
>> I tried to play a bit with the color module of skimage, but for the moment I couldn't manage to to map the jet colormap to linearly go from dark to light shades of gray. The main problem when applying a basic rgb2gray conversion is that the min/max values (blue and red) converge to the same dark value in the grayscale image, while the mid-range values (yellow/green) become the brightest.
>> 
>> Do someone has any trick to convert a "jet image" to grayscale?
>> 
>> Thanks a lot
>> 
>> Guillaume
>> 
>> PS: I have attached a picture as an example if you're willing to play with it ;)
>> 
>> 
>> -- 
>> 
>> 
>> <im2.tif><cmap.png>
> 
> -- 
> 
> 




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