On 2012–12–06 Aditya Mahajan wrote:
> I always thought that shadows were possible to do in PDF (after all
> TikZ does it using some type of PDF primitives).
It is. I use MetaPost to draw the shadows using the shading
mechanism:
withshading("circular", urcorner bottom_left, urcorner bottom_left, radius, 0)
withfromshadecolor \MPcolor{c:transparent}
withtoshadecolor col;
and it works well if placed in an overlay. However, I did not manage
to get it working in TikZ, it could not display shadings to
transparent colours (which is very handy for slides where the
shadings might overlay graphics with a non-uniform colour).
> Since you are the PDF expert, I am interested in knowing why you
> choose to go the ImageMagic route.
From my experience shadows made from MetaPost shadings (which uses
PDF shadings, I assume) are quite low level. It's harder to get the
angle, distance and shadow size correctly implemented. I think the
ImageMagick shadings are more high level and ready to use.
Marco
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