Re: [Matplotlib-users] figimage and image magnification (was: imshow with pdf)

[John H. <jd...@gm...>]

On Mon, Dec 15, 2008 at 2:44 PM, John Hunter <jd...@gm...> wrote:

> I am not sure what figimage should mean for a vector backend so I want
> to hear from Perry who motivated the function.  When I implemented it
> on his original request, I understood it to be a raw pixel dump to the
> canvas with no scaling, no interpolation, etc....  What does a pixel
> dump to a canvas mean for a vector backend?   I think we could define
> something that was at least consistent, but we should probably hear
> from Perry et al who are presumably using the function.

After sleeping on this overnight, I think the answer here is clear.
figimage is meant to be a pixel dump, so we should just treat a pixel
as a dot.  When dpi is increased, the number of dots on the canvas
increases so the figimage should look smaller.  I added your patch and
support for magnification to figimage -- the output looks right for
PNG, PDF and EPS -- svg still not.  I haven't had a chance to look but
perhaps SVG does not utilize the magnification param.  I'll check into
this later.

JDH