On Mon, Sep 20, 2010 at 9:22 AM, Jonathan Slavin <jsla...@cfa.harvard.edu>wrote:
> A non-matplotlib way to do this is to use ImageMagick or GraphicsMagick:
> gm convert -colorspace Gray color_image.png bw_image.png
> in GraphicsMagick or using the ImageMagick routine "convert":
> convert -colorspace Gray color_image.png bw_image.png
>
> I think it works on a wide variety of image formats.
>
> Jon
>
>
A word of warning on this approach though... If the graphics formats are
vector-based (ps, eps, svg, etc...), then ImageMagick will destroy the
vector information in the process, even if the output format is also vector
based. This is because ImageMagick is a raster-based library and all of its
algorithms operate upon raster data.
So, if this is for a publication, ImageMagick is not advised.
I also have another approach that allows you to convert a colormap into a
greyscale version of itself, but wouldn't work on colored lines or anything
like that. I suggest going with Friedrich's approach.
Ben Root
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