YV12 with DVD2AVI luminance filter

[colordog]

Howdy -

I've set up Gordian Knot (with MPEG2DEC3.dll and VDubMod and AVS 2.5) to encode movies using the YV12 colorspace. Since switching, it seems that the Luminance Filter information in DVD2AVI (the gain and offset) is being ignored. I found in the YV12 FAQ (http://forum.doom9.org/showthread.php?s=&threadid=37276&highlight=DVD2AVI) that this apperently does happen normally.

My question then is since the luminance information is being ignored, how or what is the best way to adjust it? All my DVD movie back-ups come out too dark. I know of some AVS plug-ins that you can add luminance with, but I'd really like something like the way that DVD2AVI does it, so you can scroll throughout the movie and check a variety of gain and offset values.

Any ideas?

[sh0dan]

ColorYUV(gain_y=something, off_y=somethong)

gamma, contrast can also be adjusted using ColorYUV - as can the equivalent for each color component. Also use opt="coring", so you don't have to use 'limiter' at the end. To see the luma distribution, use "histogram()" for graphical or "coloryuv(analyze=true)" for numerical stats to help you adjust the image.

[colordog]

sh0dan -

Hope I'm not too ignorant, but I've relied on GKnot previously to always pick out the filters in the AVscript... I understand that I can use a plug-in like ColorYUV (better than Tweak?), but will I be able to see or scroll through the movie to make sure that the gamma and contrast I choose is appropriate before encoding? (In the style of DVD2AVI).

Is the histogram function you mentioned supposed to let me view that? I've not used that through GKnot before - how would that work? Thanks in advance for any info.