Transparent output

[Juan Nunez-Iglesias]

Marcel,




What about slicing out the alpha channel?




Also, depending on memory considerations, you might try ic.concatenate(), which was my very first contribution to scikit-image! =D




Juan.

On Thu, Feb 5, 2015 at 2:22 AM, Marcel Gutsche <marcel.gutsche at gmail.com>
wrote:

> Hi all, 
> I'm not sure if it is a bug, or whether I've just overlooked something 
> obvious, but the internet did not offer much regarding this issue. I try to 
> get slices from an image cube which consists of several images s = 1,...,n 
> with the same dimensions. My new slice should have the width of the 
> original images and the height of the number of images. Here is the code to 
> do this: 
> from skimage.io import ImageCollection, imsave
> from os.path import join
> import numpy as np
> def main(dir):
>    ic = ImageCollection( join(dir, '*.png' ) )
>    row = 0  
>    img = np.empty((len(ic), ic[0].shape[1], ic[0].shape[2]  ) )        
>    for s in range(len(ic)):    
>        img[s,...] = ic[s][row,...]
> #   fname = 'new_{0:03d}.jpg'.format(v) # -> wrong colors
>    fname = 'new_{0:03d}.png'.format(v)  # -> output image is transparent
>        imsave(fname, img)
> The problem is that the output images are all transparent. My input files 
> are .png images with an alpha channel. I have also checked the values of 
> the alpha channel of the output which are all set to 255, which, at least 
> to my knowledge, should set the opacity to 100%. 
> Regards, 
> Marcel
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