Hi, While playing around for an afternoon with colors in matplotlib, I came across some inconsistencies. I was trying to define colors in sRGB (my understanding is that sRGB as a standardized color space is device-independent). Giving RGB values to matplotlib, I checked the output with a color picker -- Color Maker from the Mac App Store, set to the sRGB mode, but the built-in DigitalColor Meter gives the same result. It turns out that the colors I see in the output are not what I specified. This makes playing around with colors, a bit difficult: http://nbviewer.ipython.org/gist/goerz/9aab94f5322d5a457625 As far as I can tell, Matplotlib does not specify in which color model in interprets RGB values (this should ideally be stated in the documentation). Also, the output in different backends (IPython notebook, and interactive GUI) gave different results. As a minimal example, consider the following:
import pylab import numpy as np import matplotlib #%matplotlib inline # draw line with sRGB color 228, 26, 28 pylab.plot(np.linspace(0,10, 10), np.linspace(0,20,10), linewidth=10, color=(0.894, 0.102, 0.110)) pylab.show() # Colorpicker shows 210, 46, 13 in GUI view # Colorpicker shows 229, 39, 27 in iPython Notebook In the IPython notebook, direct PIL graphics do seem to give the right colors cf. In [5] in the linked IPython notebook (even though PIL also does not explicitly specify its color model). Just matplotlib seems off. Of course, I'm doing some slightly crazy stuff in the Notebook, displaying every matplotlib output through PIL, but I cecked that `%matplotlib inline` actually produces the same colors. Should I file this on github as a bug report? Best, Michael P.S.: please CC for direct replies ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users