why this error when i use the separate channel from RGB image in integer wavelet transform?

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Ahmed almansory 2016-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/313438-why-this-error-when-i-use-the-separate-channel-from-rgb-image-in-integer-wavelet-transform

评论： Ahmed almansory 2016-11-22

hello, please help me

when i use the integer wavelet transform on RGB image everything is ok there is no problem, but when i separate the image into its layers R, G, and B and applying the integer wavelet transform in single layer R, G, or B the program return errors _ _ "Integers can only be combined with integers of the same class, or scalar double."__ .this error will gone if i convert the data type of layer from uint8 class to double class but i want to keep the integer type. please help me to solve this problem?

imdata = imread('1.tif');
liftscheme = liftwave('haar','int2int');
RedChannel= imdata (:, :, 1);
GreenChannel = imdata (:, :, 2);
BlueChannel = imdata (:, :, 3);
[LLC, LHC, HLC, HHC] = lwt2(RedChannel, liftscheme);