Am 06.12.2012 19:35, schrieb Marco:
> 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;
>
Don't mix Type2/3 with Type 4/5 shadings (see my answer to Aditya). They
are all called 'shadings', but only the latter can be used for the
creation of realistic looking drop shadows.
And to repeat myself: there is nothing wrong with bitmaps. Take the best
from both worlds ;-)
> 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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