image - How to add a new colormap on a raster dataset? -


i trying replicate arcgis functionality in matlab, add colormap function. add colormap function in arcgis associates .clr file tiff image image has custom color scheme associated tiff when viewed.

my tiff images have 6 values (1 - 6) in unsigned 8-bit integer format. can see screenshot of images have 1, 2, or 3 values, while others have 6 values--resulting in variable on-screen color rendering.

i see matlab has colormap functionality, however, appears designed figures, rather tiff files. how can associate colormap these tiff images in matlab when view them (e.g. in arcgis), have custom color scheme?

enter image description here

as of commenters have pointed out, colormap functionality isn't limited figures. colormap concept lookup table maps particular value (index) specific color (in rgb, typically).

if check out documentation imwrite, see can specify colormap second input function.

load mri im = squeeze(d(:,:,12));  % indexed image (m x n)  % save without specifying colormap imwrite(im, 'nocolormap.tif')

enter image description here

now save colormap

imwrite(im, heat, 'colormap.tif')

enter image description here

the other alternative, create rgb image within matlab , save image without providing colormap imwrite. can either create image manually

% normalize little bit display im = double(im) ./ max(im(:)); output = repmat(im, [1 1 3]);   % make image (m x n x 3)  imwrite(output, 'rgb_grayscale.tif')

enter image description here

or can use built-in functions gray2rgb or ind2rgb convert indexed image rgb image using specific colormap.

 rgb_image = gray2rgb(im, jet);  imwrite(rgb_image, 'rgb_jet.tif')

enter image description here

one thing pretty important remember in of default, matlab colormap has 64 colors. if need more colors that, can specify when constructing colormap

size(gray)      64   3  size(gray(1000))      1000   3

this particularly important if you're trying display high fidelity data.


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