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.
I've tried to search archives and the web to find information about
this, to no avail. If I've missed anything, I'd appreciate a pointer to
the information. Otherwise, this seems to me to be a bug, but it might
be a misunderstanding of the functions as I'm quite new to Cinelerra.
Thanks!
joey
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