imresize in PIL/scipy.misc only works for uint8 images? any alternatives?

Question

It seems the imresize implemented in PIL/scipy.misc only works for uint8 images

>>> import scipy.misc
>>>         


        

Answer 1

Thanks to cgohlke's comment. Below are two alternatives I found that works for float-number images.

1. Use scipy.ndimage.interpolation.zoom

For single-channel images: im2 = scipy.ndimage.interpolation.zoom(im, 0.5)

For 3-channel images: im2 = scipy.ndimage.interpolation.zoom(im, (0.5, 0.5, 1.0))

2. Use OpenCV.

im2 = cv2.resize(im, (im.shape[1]/2, im.shape[0]/2))

This works for both single-channel and 3-channel images. Note that one needs to revert the shape order in second parameter.

Answer 2

you could also use the mode='F' option in the imresize function

imresize(image, factor, mode='F')