Jet colormap (LUT)

[Neil Fazel]

Under Image -> Lookup Tables, there are several dozen colormaps, but not what's known at "Jet". (That's what Matlab calls it.) I think it's a popular colormap. (The color progression looks somewhat like that in the visible spectrum.) Is it perhaps hiding under a different name?

Thanks,
Neil

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[Gabriel Landini]

On Tuesday 04 Jun 2013 21:35:46 Neil Fazel wrote:
> Under Image -> Lookup Tables, there are several dozen colormaps, but
not
> what's known at "Jet". (That's what Matlab calls it.) I think it's a
> popular colormap. (The color progression looks somewhat like that in
the
> visible spectrum.) Is it perhaps hiding under a different name?

I have one lut called jet (attached).
Cheers

Gabriel



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[Jerome Mutterer-3]

Dear Neil, dear Gabriel,

the jet LUT can also be computed by this macro I adapted from a blog
post from Matt Stine that I found at http://www.metastine.com/?p=7

Jerome.


r=newArray(256);g=newArray(256);b=newArray(256);
for (i=0;i<256;i++) {
i4=4*i/256;
r[i]=255*minOf(maxOf(minOf(i4-1.5,-i4+4.5),0),1);
g[i]=255*minOf(maxOf(minOf(i4-0.5,-i4+3.5),0),1);
b[i]=255*minOf(maxOf(minOf(i4+0.5,-i4+2.5),0),1);
}
setLut(r,g,b);




On 4 June 2013 23:18, Gabriel Landini <[hidden email]> wrote:

> On Tuesday 04 Jun 2013 21:35:46 Neil Fazel wrote:
>> Under Image -> Lookup Tables, there are several dozen colormaps, but
> not
>> what's known at "Jet". (That's what Matlab calls it.) I think it's a
>> popular colormap. (The color progression looks somewhat like that in
> the
>> visible spectrum.) Is it perhaps hiding under a different name?
>
> I have one lut called jet (attached).
> Cheers
>
> Gabriel
>
>
>
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> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

... [show rest of quote]

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[Neil Fazel]

Dear Jerome, and Gabriel,

   Thanks for your help. I will try both solutions.

Regards,
Neil


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[Tiago Ferreira-2]

Hi Neil,

On 2013.06.04, at 16:35 , Neil Fazel wrote:
> Under Image -> Lookup Tables, there are several dozen colormaps, but not what's known at "Jet".

Just wanted to mention that if you are using Fiji, there is an entry "Sholl LUT" at the bottom of
the Image>Lookup Tables> menu that implements the Jet LUT using a similar approach to Jerome's.

-tiago
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