img_as_float

[Johannes Schönberger]

Hi everyone,

There has been a little discussion in #1945 about our range conversion and I think that we should try to avoid `img_as_float` in our functions as much as possible, unless really necessary for the correctness of the algorithm. In most cases, there is no reason to tinker around with the range of values of the input image. Some examples:

skimage.filter.gaussian_filter
skimage.transform.warp et al.
skimage.filter.sobel et al.
skimage.restoration.denoise_tv_chambolle

What is your opinion?

Best, Johannes