KVCD: Need Video to be Brighter!

CheronAph · #1 01-06-2004, 02:22 PM

If I want my movie to be a little brighter, is it wise to use TMPGEnc´s simple color correction?

Jellygoose · #2 01-06-2004, 03:16 PM

No definetely not. Use something like this:

Levels(0,1.2,255,0,255)

And play with the value (1.2). Values above 1 make the movie brighter, values below make it darker.

CheronAph · #3 01-06-2004, 03:31 PM

Thanks, does it matter where I put that in the script?

Dialhot · #4 01-06-2004, 04:30 PM

Quote:

Originally Posted by CheronAph

Thanks, does it matter where I put that in the script?

If you want to raise the brtight, put them after all the filters. If you want to darkin, put it just after the load of the source. All that because the value Jelly told you to adapt is the gama factor. And it affects everything including noise. Darkeking a noise reduce it, but brightinh it turns the noise worst; So it's clever to darken before denoising and lighten adter denoising.

CheronAph · #5 01-06-2004, 05:00 PM

Are there other good ways to brighten the film, Tweak(...) maybe?

incredible · #6 01-06-2004, 06:00 PM

The better way is as Jell showed!

Just do open your orig source using Vdub and choose its internal Vdubfilter "Levels" .... go and pick a "sample" (tab in the filter) in a scene ....
a) .... where its very very dark

and move the left cursor that right until it touches the left end of the histogram.
b) .... where its very shining bright (like an explosion) and move the right cursor to the left until it touches the right end of the histogram.

Values should be like this

5_______1.000________245

0____________________255

First cursor bar is the full proporional modification range of the RGB/Luma

Second bar is the range which will be delivered of that resulting Luma in total of the stream.

So maybe you want to correct all your luma up to its peaks, ok, it looks nice BUT legal TV values do not allow that range between 0 and 255 and thats why you "can" correct" this afterwards as a whole. BUT we don't do that in VDub here!

So just not the values in order of appearance.
5,1.0,245,0,255

Then enter your AVS Script and put the Levels() Command

Levels(5,1.0,245,0,255)

Thats it!
And you don't need here to modify the last (0,255) values as Levels() now got the safe option "Coring" integratet which preserves a full TV legal luma range of 16-235

But caution! The image on aPC screen generally does appear more dark than in comparison to your Tv afterwards ..... that's why I would NOT change the gamma (1.0) value in levels. just a hint!

Dialhot · #7 01-06-2004, 06:17 PM

Quote:

Originally Posted by incredible

Just do open your orig source using Vdub and choose its internal Vdubfilter "Levels"

Or use the "Levels" tab of ffdshow that allows to see the effect while you are watchign the movie :P

incredible · #8 01-06-2004, 06:20 PM

Or that way ... :P *lol*

DialHot, ... just gimme everything you want me to treat ... even hybrid NTSC streams to handle for 25PAL FPS but .... I think that ffdshow doesn't like me personally

I can do what I want

CheronAph · #9 01-07-2004, 05:14 AM

Vdub is great for avi sources but what about d2v?

Dialhot · #10 01-07-2004, 05:23 AM

Quote:

Originally Posted by CheronAph

Vdub is great for avi sources but what about d2v?

Just do an avs script with "mpeg2source("yourfile.d2v")" and open it in virtualdub.

CheronAph · #11 01-07-2004, 05:30 AM

Hey, that works, thanks!

incredible · #12 01-07-2004, 05:48 AM

BTW: Change to VirtualDubMOD as it supports full Avisynth editing (incl.Syntax/Spelling scanning) + direct previewing and so on! If you got problems using the FFdshow way from Dialhot, this is almost the same WYSIWYG way.

Both modes (FFdshow or VirtualDubMod) and their real preview you will love when testing filters and scrpit syntax)

CheronAph · #13 01-07-2004, 06:00 AM

Wow, that editor is great, thanks for the tip!