No, that is not an option for imwrite().
You can getframe() the image to grab a copy of it exactly as displayed. Or you can calculate the mapped image and write that.
minD = min(YourData(:));
maxD = max(YourData(:));
mapped_image = (double(YourData) - minD) ./ (maxD - minD);
ncmap = size(colormap, 1);
mapped_image = mapped_image .* ncmap;
if ncmap == 2
mapped_image = mapped_image >= 0.5; %logical
elseif ncmap <= 256
mapped_image = uint8(mapped_image);
else
mapped_image = uint16(mapped_image);
end
imwrite( mapped_image, 'YourData.tif' )
This assumes that you used imshow(YourData, []) . If you provided a specific data range then,
minD = Lo; %you used imshow(YourData, [Lo, High])
maxD = High;
Subtle issue here: the Lo value you supply is greater than the data minimum, or the High value you supply is less than the data minimum, then the numeric mapping (before the conversion to logical or uint8 or uint16) will have some values that are negative, or greater than the number of entries in the color map. The code I have chosen for datatype conversion clips the intensities so that nothing is out of range after datatype conversion. uint8() and uint16() "saturate to 0" for values < 0, and "saturate to maximum" for values too large.
