Hi,
You can use ' imresize ' and ' colormap ' functions. You can do something similar to the code below.
>> img1 = imresize(img,[224 224]);
>> col_map = colormap(winter); % You may use any colormap of your choice
>> imwrite(img1,col_map,'colorimage.jpg','jpg');
>> img_new = imread('colorimage.jpg');
>> figure;imshow(img_new);
