Thread Subject: Converting grayscale image to RGB using mapping function

I have a function that takes a value (0..1) and returns an [r, g, b]
triple. Is there a quick way to 'apply' it to a grayscale image MxN
to produce an RGB MxNx3 image?

Francis

On Nov 10, 9:44 am, Francis Burton <fbur...@nyx.net> wrote:
> I have a function that takes a value (0..1) and returns an [r, g, b]
> triple. Is there a quick way to 'apply' it to a grayscale image MxN
> to produce an RGB MxNx3 image?
>
> Francis


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You can use the function ind2rgb() in the image processing toolbox.
If you don't have that toolbox, you can very easily write it yourself.

In article <6bd8a425-59ea-4ddc-a65d-248cb44d39fb@15g2000yqy.googlegroups.com>,
ImageAnalyst <imageanalyst@mailinator.com> wrote:
>On Nov 10, 9:44?am, Francis Burton <fbur...@nyx.net> wrote:
>> I have a function that takes a value (0..1) and returns an [r, g, b]
>> triple. Is there a quick way to 'apply' it to a grayscale image MxN
>> to produce an RGB MxNx3 image?
>------------------------------------------------------------------------------------------------------
>You can use the function ind2rgb() in the image processing toolbox.
>If you don't have that toolbox, you can very easily write it yourself.

There it was - right under my eyes! The trick was realizing that
a double matrix in the range 0..1 can be converted into a true
indexed image by

im_indexed = floor(data*size(map,1));

Thanks for pointing me in the right direction.

Francis