When I use skimage.transform.rescale to reduce size of an image by 40% the datatype is converted from uint8 to float64.
I can manually change the datatype but I don't want to have too many manual interventions in my code.
Is there any rescaling method keeping the datatype? I am also alternatively open to methods changing the datatype.
You could use the utility function img_as_ubyte to convert the rescaled image back to uint8.
In [26]: from skimage import util, data, transform
In [27]: img = data.moon()
In [28]: img.shape
Out[28]: (512, 512)
In [29]: img.dtype
Out[29]: dtype('uint8')
In [30]: res = util.img_as_ubyte(transform.rescale(img, 0.6))
In [31]: res.shape
Out[31]: (307, 307)
In [32]: res.dtype
Out[32]: dtype('uint8')