On Fri, Feb 27, 2015 at 10:33 PM, Sturla Molden <sturla.mol...@gmail.com> wrote: > > Somewhere... But where is it? > > NumPy, SciPy, Matplotlib, Cython or ipython? > > I am suspecting ipython, but proving it is hard... > > http://nbviewer.ipython.org/urls/dl.dropboxusercontent.com/u/12464039/lenna-bug.ipynb
When plt.imshow() is given floating point RGB images, it assumes that each channel is normalized to 1. You are mixing a 0..255 image with a 0..1 image. Divide `lenna` by 255.0 before you stack it with `_dct`. Or multiply `_dct` by 255 and cast it to uint8. -- Robert Kern
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