On a side note, can't we get a real bug tracker somewhere?

--- I have a selection of grayscale (8bit) tifs in a directory.

In [14]: k = io.ImageCollection("calib/*.tif", True)

In [15]: k[0].dtype Out[15]: dtype('uint8')

In [16]: k = io.ImageCollection("calib/*.tif", as_grey=True)

In [17]: k[0].dtype Out[17]: dtype('float32') --- But the docs say: as_grey : bool, optional If True, convert the input images to grey-scale. This does not affect images that are already in a grey-scale format.

Obviously the image data type gets converted though.

Cheers, Holger