This filter emulates the visuals of a color positive film developed C-41. That procedure – also known as ”cross processing“ has some amazing effects on contrast and color balance oft the image. …
Legal considerations around the U.S. Patent No. 5,838,906, currently held by infamous Eolas company for the single purpose of "defending" it, forces Opera to abstain from implementing any measures that could be interpreted as ”invoking external application providing interaction and display of embedded objects“.
Therefore the user of Opera has to take the burden to ”click-to-activate“ a Flash applet in a web page first, before he is able to use it and interact with it.
This ”click-to-activate“-hassle can be removed individually by an Opera-user on his end (and in his own responsibility!) by patching the Opera binary code.