adding an RGB volume to a grayscale MRI volume
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I have a grayscale MRI volume of dimension 160x216x176.
I also have a volume corresponding to its labels, which is in RGB, so its 160x216x176x3.
I want to use imshow to show each mri volume slice superimposed to its labels, with the mri volume appearing in gray and the labels appearing in a custom colormap that I created.
I use this to produce the RGB slices:
labelRGB_slice=label2rgb(handles.label(:,:,handles.current_slice_z), my_colormap, [0 0 0]);
handles.labelRGB(:,:,handles.current_slice_z, : , : , :) = labelRGB_slice;
this is the imshow that I plan to use to update axes:
imshow((handles.imdata_show(:,:, handles.current_slice_z) +...
handles.labelRGB(:,:,handles.current_slice_z, : , : )),...
'DisplayRange', [])
it's obviously faulty cause the matrix dimensions don't agree, but I don't know how to fix the grayscale slice to make it addable to the rgb slice.
What should I use here? repmat? ind2rgb?
I tried using ind2rgb with a 'gray' colormap, like this:
imshow((ind2rgb(handles.imdata_show(:,:, handles.current_slice_z), gray) +...
squeeze(handles.labelRGB(:,:,handles.current_slice_z, : , : ))),...
'DisplayRange', [])
and got this botched image, losing all gray contrast (rgb labels haven't been placed yet):
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