[yt-users] Colorbar and labels on volume rendered images

[Elizabeth Harper-Clark]

Thanks Britton,

Concatenating is working :-) now to work out labels......

Thanks,

Libby

On 5 January 2011 11:29, Britton Smith <brittonsmith at gmail.com> wrote:

> It is possible to attach a colormap to a volume render image.  I can't
> quite remember how to do that.  If someone else could chime in on that, that
> would be great.
> If you already have the colorbar image you want, you can concatenate two
> image arrays easily and then write out the new image, provided the arrays
> are the same size in one direction.  With pylab, you can do something like
> this:
> from matplotlib import pylab
> import numpy as na
> from yt.visualization.image_writer import write_bitmap
> image1 = pylab.imread(file1)
> image2 = pylab.imread(file2)
> new_image = na.concatenate([image1, image2], axis=1)
> write_bitmap(new_image, output_file)
>
> I believe the image_writer now supports adding text as well, so that should
> take care of the labels.
>
> Britton
>
> On Wed, Jan 5, 2011 at 10:46 AM, Elizabeth Harper-Clark <
> h-clark at astro.utoronto.ca> wrote:
>
>> Good morning everyone,
>>
>> I was wondering how to add colorbars and text labels (e.g. with the time)
>> to images produced through volume rendering. I am unsure of how to adapt all
>> the usual techniques I know for projections etc. gievn the different
>> technique for drawing the images. I am using a constant colorbar so if
>> anyone can suggest a post-processing way of adding to created images that
>> would work too!
>>
>> I am using the following to create my volume rendered images:
>>     for i, snapshot in enumerate(cam.rotation(2.*na.pi, n_angles)):
>>         print "     drawing:  dump =", numb, "angle =",  i, "shot=",shott
>>         if cam._mpi_get_rank() == 0:
>>             write_bitmap(snapshot, frame_template % (sys.argv[-1],shott))
>>             pl.draw()
>>             shott = shott+1
>>
>> Many thanks,
>>
>> Libby
>>
>> --
>> Elizabeth Harper-Clark MA MSci
>> PhD Candidate, Canadian Institute for Theoretical Astrophysics, UofT
>> Sciences and Engineering Coordinator, Teaching Assistants' Training
>> Program, UofT
>>
>> www.astro.utoronto.ca/~h-clark <http://www.astro.utoronto.ca/%7Eh-clark>
>> h-clark at cita.utoronto.ca
>> Astronomy office phone: +1-416-978-5759
>>
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>>
>
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-- 
Elizabeth Harper-Clark MA MSci
PhD Candidate, Astrophysics, UofT

www.astro.utoronto.ca/~h-clark <http://www.astro.utoronto.ca/%7Eh-clark>
h-clark at cita.utoronto.ca
AIM: edphc1
MSN: edphc1 at hotmail.com
Skype: eharperclark
Office phone: 416-978-5759
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