Re: [Matplotlib-users] Question about imshow
On Sun, May 17, 2009 at 11:07 PM, Jae-Joon Lee lee.j.j...@gmail.com wrote: I think one possible solution would be to simply deprecate the support for PIL image in imshow, and let users explicitly use array-interface via asarray function. Is there any other idea? I'll make this change unless someone come up with something. I'm not wild about removing the PIL functionality entirely just to remove an inconsistency. Andrew wrote the PIL support -- perhaps he can comment. JDH -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Question about imshow
John Hunter wrote: On Sun, May 17, 2009 at 11:07 PM, Jae-Joon Lee lee.j.j...@gmail.com wrote: I think one possible solution would be to simply deprecate the support for PIL image in imshow, and let users explicitly use array-interface via asarray function. Is there any other idea? I'll make this change unless someone come up with something. I'm not wild about removing the PIL functionality entirely just to remove an inconsistency. Andrew wrote the PIL support -- perhaps he can comment. I wouldn't remove PIL support in imshow immediately, either, but I think deprecation should be OK. Since Image-numpy conversion is now happening through the array interface, I don't think there's much call to support PIL directly anymore. We should make the deprecation warning give the appropriate hint (In the future, 'imshow(pil_image)' will not be supported. Use 'imshow(np.array(pil_image))' instead. Note that you may need an origin='upper' keyword argument for the latter case.) -Andrew -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Question about imshow
I think the point here is that
img = Image('foo.png')
imshow(img)
and
img = Image('foo.png')
imshow(asarray(img))
give different results, since matplotlib.image.pil_to_array functions
differently from what PIL exposes in __array_interface__
--
Pauli Virtanen
I see. Thanks for clarifying this. And yes, I think this should be fixed.
Hmm, it seems that somehow pil_to_array tries to make the image
upside-down by itself.
x_str = im.tostring('raw',im.mode,0,-1)
However. I'm afraid that changing this behavior may not be ideal for
backward-compatibility.
I think one possible solution would be to simply deprecate the support
for PIL image in imshow, and let users explicitly use array-interface
via asarray function.
Is there any other idea?
I'll make this change unless someone come up with something.
-JJ
--
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[Matplotlib-users] Question about imshow
Hi, I want to read images and do some processing with them. While learning how to do this, i.e. opening images, displaying them, transforming them tu numpy arrays, etc., I came across a strange behaviour. If I open an image and use imshow() to display it, it comes upside down. See this thread in the numpy mailing list for more details: http://thread.gmane.org/gmane.comp.python.numeric.general/30148 . Someone on that list suggested to check here if this behavior was correct. Is it normal that the image appears upside down? If yes, can someone explain what's going on? jorge -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Question about imshow
On Sat, May 16, 2009 at 6:58 PM, jorgesmbox...@yahoo.es wrote: Hi, I want to read images and do some processing with them. While learning how to do this, i.e. opening images, displaying them, transforming them tu numpy arrays, etc., I came across a strange behaviour. If I open an image and use imshow() to display it, it comes upside down. See this thread in the numpy mailing list for more details: http://thread.gmane.org/gmane.comp.python.numeric.general/30148 . Someone on that list suggested to check here if this behavior was correct. Is it normal that the image appears upside down? If yes, can someone explain what's going on? Note that the image may be upside down for you but may be correct for others. The array itself does not know about the orientation of the image and you have to explicitly specify this. For imshow (and other similar commands), use the origin keyword. e.g., imshow(a, origin=lower) http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.imshow -JJ jorge -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Question about imshow and matshow
Hello everybody, when using matplotlib, any plot I create is displayed separately from my Tkinter application. Is there a direct way to embed the plot created by matplotlib in a widget such as a canvas using something like create_image or something else ? Currently, the only thing I managed to do is: -create my plot with matshow -save the figure using savefig (png) -embed the png in a canvas using create_image not very smart, isn't it ? Thank you very much best regards Eric Pellegrini - Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Question about imshow and matshow
On 3/15/07, Pellegrini Eric [EMAIL PROTECTED] wrote: Hello everybody, when using matplotlib, any plot I create is displayed separately from my Tkinter application. Is there a direct way to embed the plot created by matplotlib in a widget such as a canvas using something like create_image or something else ? Currently, the only thing I managed to do is: -create my plot with matshow -save the figure using savefig (png) -embed the png in a canvas using create_image not very smart, isn't it ? Definitely not ;). It's simple to embed matplotlib in the common toolkits. Download the examples tarball from the matplotlib site and look at the files embedding_in_XXX.py. There are examples for tk, gtk, qt and wx toolkits. Thank you very much best regards Eric Pellegrini ~ Antonio - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] question about imshow
Hi, I'm struggling to get an array plotted the way I want with imshow. I have an array A which i try to plot with e=(tdims[0], tdims[-1], wldims[-1], wldims[0]) imshow(A,extent=e) The image displays fine in the x axis, with tdims marked correctly, but in the yaxis the dimensions are incorrect. And no combination of extent and origin gives the correect display. To be more clear, without extent set I get the array displayed the right way round, but my problem is that my y axis should be *decreasing* as it goes up the side of the image; if I set extent correctly, the image is scaled right with respect to the y axis, but it is flipped so that the y axis is increasing upwards. Is there a way to prevent this? Many thanks for any help! Ans thanks for an excellent plotting library! Best regards John - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] question about imshow
On Tuesday 12 December 2006 06:57, John Travers wrote: Hi, I'm struggling to get an array plotted the way I want with imshow. I have an array A which i try to plot with e=(tdims[0], tdims[-1], wldims[-1], wldims[0]) imshow(A,extent=e) if I set extent correctly, the image is scaled right with respect to the y axis, but it is flipped so that the y axis is increasing upwards. Is there a way to prevent this? MMh. You can always play with the limits on the y axis: gca().set_ylim(N.asarray(gca().get_ylim())[[-1,0]]) will invert (ymin, ymax) on the current axis (gca()) - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] question about imshow
On 12/12/06, Pierre GM [EMAIL PROTECTED] wrote: On Tuesday 12 December 2006 06:57, John Travers wrote: Hi, I'm struggling to get an array plotted the way I want with imshow. I have an array A which i try to plot with e=(tdims[0], tdims[-1], wldims[-1], wldims[0]) imshow(A,extent=e) if I set extent correctly, the image is scaled right with respect to the y axis, but it is flipped so that the y axis is increasing upwards. Is there a way to prevent this? MMh. You can always play with the limits on the y axis: gca().set_ylim(N.asarray(gca().get_ylim())[[-1,0]]) will invert (ymin, ymax) on the current axis (gca()) Thanks for your answers! Pierre's method worked (I didn't try Scott's). Cheers, John - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] question about imshow
This slightly modified excerpt from the new version of spy may do what you want: nr, nc = Z.shape extent = [-0.5, nc-0.5, nr-0.5, -0.5] return self.imshow(Z, interpolation='nearest', extent=extent, origin='upper') Eric John Travers wrote: Hi, I'm struggling to get an array plotted the way I want with imshow. I have an array A which i try to plot with e=(tdims[0], tdims[-1], wldims[-1], wldims[0]) imshow(A,extent=e) The image displays fine in the x axis, with tdims marked correctly, but in the yaxis the dimensions are incorrect. And no combination of extent and origin gives the correect display. To be more clear, without extent set I get the array displayed the right way round, but my problem is that my y axis should be *decreasing* as it goes up the side of the image; if I set extent correctly, the image is scaled right with respect to the y axis, but it is flipped so that the y axis is increasing upwards. Is there a way to prevent this? Many thanks for any help! Ans thanks for an excellent plotting library! Best regards John - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
