Re: evince, beamer, gradient problem

[Pat Suwalski <pat suwalski net>]

Cześć Marek,

Marek Kozlowski wrote:
> I use the beamer LaTeX package (teTeX) for generating pdf slides. Those 
> can be perfectly displayed with the Acrobat 6/7/8 under Windows or 
> Linux. Unfortunately, the Evice incorrectly displays slide titles. Looks 
> like some problem with the gradient? See the file beamer.png attached to 
> this e-mail.

This is a common problem with gradients in PDF files. The ones exported 
from OpenOffice do that as well.

What happens is that every rectangle "step" of the gradient has an 
antialiased edge, and so you end up with a two anti-aliased edges 
forming a lighter-coloured gap between the rectangles.

Programs that export gradients in a more overlapped fashion (first step 
full width of of object, next width-1, next width-2) avoid this problem 
altogether.

As an aside, does anyone know of any software that actually uses 
gradients as specified fill methods from the PDF format?

--Pat