On Thursday 21 December 2006 06:30, Joey Richards wrote: > Hello, > > I'm having trouble with dissolves into static PNG images. I have a > simple video with two tracks -- one for the video and another where I > place PNG title images, etc. These titles are text on a translucent > (alpha<1) background rectangle to increase readability. I'd like these > to quickly fade in and out to avoid the jarring affect of their suddenly > popping on to the screen. > > I tried this with a dissolve transition at the start and end of each > region with the PNG image. The title track is empty between PNG images. > The dissolve from an image to a blank region works as I expect -- the > background box gently fades out. > > The transition when the PNG appears does not work correctly. On the > first frame as the dissolve begins, a very dark region corresponding to > the text background box appears and then the image fades in. This is > what I'd expect if the alpha is not being correctly interpolated -- > e.g., if it faded from 1 instead of from 0. > > In case this was a problem with a transition from nothing to the image, > I have tried placing a blank (alpha = 0 everywhere) image before the PNG > title -- no effect, it still pops in black then fades in. I can get the > effect I want by keyframing the fade attribute of the track, but this is > a lot more tedious than just dropping a dissolve onto the clip.
Please create a bug report, bugs.cinelerra.org. Attach a small project that shows the problem, along with the PNG (video is not needed). -- Hannes _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
