Mailman 3 February 2015 - scikit-image

Google Summer of Code 2015
by Stefan van der Walt Feb. 8, 2015

Feb. 8, 2015

Hi everyone It's almost time to submit project outlines for Google Summer of Code projects, so please make suggestions here or update the wiki at https://github.com/scikit-image/scikit-image/wiki/GSoC-2015 Thanks! Stéfan

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Transparent output
by Marcel Gutsche Feb. 6, 2015

Feb. 6, 2015

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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Interactive Mona Lisa Demo
by Adam Hughes Feb. 5, 2015

Feb. 5, 2015

Hey everyone, I made an interactive demo for a class I'm TAing where the user loads an image (default is mona lisa prado) and they can dynamically change HSV or RGB values with sliders, and the altered image is updated in realtime. The point of this excercise is to try to mimic the fading of the mona lisa prado colors into the tinged yellow version of the original Mona Lisa on display today. This program uses TraitsUI and Chaco for its interactivity, so probably isn't of direct use for the image viewer; however, in the spirit of interactive examples, I thought it would be cool to share. It was much easier to get Chaco and play nicely with image data than I thought it would be. /home/glue/Desktop/monolisa.tar.gz *Note: this will be very slow if you use the high-res version of the mona lisa prado, so please start by trying the lowres files*. Requirements: scikit-image numpy chaco traits traitsui enable

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Labels on GitHub issues
by Stefan van der Walt Feb. 5, 2015

Feb. 5, 2015

Hi all Our current set of GitHub labels are not utilized, probably because they don't make much sense i.t.o. our workflow. If you've seen any good usage patterns for labels out there, i.e. ways we can use them to improve our development process, please let me know. Thanks Stéfan

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Image viewer plugin, refreshing low and high values of the slider widget
by Marcel Gutsche Feb. 4, 2015

Feb. 4, 2015

Hi folks, another image viewer plugin related question. Is it possible to update the low and high values of the slider widget based on the return values of plugin function? E.g something like this? custom_plugin = Plugin(image_filter = calc_and_show) custom_plugin += Slider('parameter1', low = calc_and_show.lower_bound(), high = calc_and_show.upper_bound() ) Thanks for the great support so far! Marcel

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