Hallo Guys,

- open the Squence-Editor and a 2nd Window with the Sequnece Output
- add some Movie or Image-Sequence
- klick the OpenGL Rendering-Button in the Header of the Sequence Output

-> The Rendering ist realy darker as the original Movie/Image-Sequence

- add a Effect-Strip to the Movie/Image-Sequence
- klick again the OpenGL Rendering-Button in the Header of the Sequence Output

-> the Rendering ist bright as expected

Xubuntu 11.10 64bit
GeForce 520 GT
Blender 2.63 official; Blender 2.63.2 r46135

Thank you and greetings

qp