Re: Drop-Shadow proposal

On Sep 14, 2009, at 8:49 AM, Brad Kemper wrote:

>> I am not sure I understand physics here. See:
>> 1) For shadow purposes that logo is treated as if it is transparent  
>> (punched) so it does not cast the shadow.
>> 2) But at the same time it is rendered as if it is non-transparent.
>
> With inner shadows, wherever there is solid color, it renders as  
> though that color is on a surface below a transparent cut-out.  
> Because the logo is solid and opaque, you see the unobscured color  
> of it on that lower surface. Wherever there is transparency in the  
> original image, you get the effect of a surface floating above the  
> lower surface, casting a shadow on whatever colors were not  
> transparent.
>
>> Seems like contradictory for me.
>

This might help show what is going on a little more clearly:

http://www.bradclicks.com/cssplay/concentric.html