brightness

[saladonyourlincoln]

Have searched in vain throughout the forums and guides for any application or procedure that will allow me increase the brightness on any of my DIVX and/or XVID AVIs. I read in one post where Virtualdub could accomplish this task but how it does it was not mentioned. If anyone who knows how to accomplish this with whatever tool could please post a guide, I know I would greatly appreciate it and so would others. Or if anyone would just please explain it to me in "newbie terms" I could fix all my RATHER DARK AVIs once and for all.


Thanks for whatever help you may provide...

[fritzi93]

VirtualDub ->Video -> Filters -> Add -> Levels -> (Double Click). Under Input Levels, change 1.000 to, for example, 1.300. OK. Preview output. Adjust as desired.

[guns1inger]

You will have to do them one at a time, and you will have to reencode to make the changes permanent. You can batch them through virtualdub and let a few run overnight if you wish.

[saladonyourlincoln]

Thank you Fritzi93 AND guns1inger for your help. I will try this when I get home from work today and I have high expectations. Again, I do appreciate your insight into this. Funny tho that this particular topic is not covered in any of the VirtualDub guides. Again, thanks so much...

[fritzi93]

Well maybe a guide on manipulating filters in general. That would be useful, I guess. But there are too many redundant guides already, IMHO.

[saladonyourlincoln]

Hey, Fritzi93...one more simple question...

After I adjust the Input Level to the desired level...
would I then...

Audio -> Direct Stream Copy
Video -> Direct Stream Copy
File -> Save as avi -> <NewFileName>

to save this "brighter" avi for encoding?

[celtic_druid]

Direct streaming for the video would disable the video filter. Basically you just get another identical copy.

My advice: Set the video to fast recompress and use AVISynth to adjust the brightness. To use VirutalDub for filtering, set the video to full processing. Means converting to RGB24 though.

[kschang]

You have to do "full processing" for the video to use the flters. The audio can stay in "Direct Stream Copy".

[fritzi93]

Like Celtic_Druid says, you can feed VDub an Avisynth script to open the file. In the script you can include the Levels command, it's analagous to the Levels filter in VDub. Like this:

Levels(0,1.3,255,0,255)

The 1.3 does the same as the 1.300 in the earlier example. I'd use the VDub filter just for previewing and deciding on the setting.

For more on Avisynth, look here:

http://www.avisynth.org/