Quantcast Avisynth: Filter for Reducing Brightness? - digitalFAQ.com Forums [Archives]
  #1  
02-11-2003, 07:12 AM
Kane Kane is offline
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hi

can someone tell me which filter reduces the brightness while encoding?
my files all become to bright
or is there an option in tmpgenc, like the "luminance gain"-option in DVD2SVCD to achive this effect?
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02-11-2003, 08:22 AM
Fiz Fiz is offline
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There is a function called Tweak which is now built into Avisynth. Here are the details from the help html file.

Tweak
Tweak(clip, float "hue", float "sat", float "bright", float "cont")

This function provides the means to adjust the hue, saturation, brightness, and contrast of a video clip.

Tweak requires YUY2 input. Use ConvertToYUY2() if necessary.

Hue: (-180.0 to +180.0, default 0.0) is used to adjust the color hue of the image. Positive values shift the image towards red. Negative values shift it towards green.

Sat: (0.0 to 10.0, default 1.0) is used to adjust the color saturation of the image. Values above 1.0 increase the saturation. Values below 1.0 reduce the saturation. Use sat=0 to convert to grayscale.

Bright: (-255.0 to 255.0, default 0.0) is used to change the brightness of the image. Positive values increase the brightness. Negative values decrease it.

Cont: (0.0 to 10.0, default 1.0) is used to change the contrast of the image. Values above 1.0 increase the contrast. Values below 1.0 decrease the contrast
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  #3  
02-13-2003, 08:46 AM
Kane Kane is offline
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thanks, i will try it that way
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02-13-2003, 08:59 AM
Fiz Fiz is offline
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If your source movie was not bright to start with and you are using dvd2avi, then another thing to check is the option for YUV-> RGB under video. If this is set to TV Scale then the it seems to make movies brighter when you create the D2V file and use it for encoding. Set it to PC Scale if that is the case.
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02-13-2003, 12:18 PM
Kane Kane is offline
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im not using dvd2avi, so this cannot be the problem i think
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02-13-2003, 01:03 PM
Kane Kane is offline
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im a little confused
what would i have to add in my avs script to lower the brightness to -70?

edit: i got it
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02-14-2003, 09:57 PM
jorel jorel is offline
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Quote:
Originally Posted by Fiz
If your source movie was not bright to start with and you are using dvd2avi, then another thing to check is the option for YUV-> RGB under video. If this is set to TV Scale then the it seems to make movies brighter when you create the D2V file and use it for encoding. Set it to PC Scale if that is the case.
hy Fiz,how are you?

today i was thinking about this:
"If this is set to TV Scale then the it seems to make movies brighter when you create the D2V file and use it for encoding."
really works,but

"...check is the option for YUV-> RGB under video..."
please,the color is better in RGB?

thanks in advance!
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  #8  
02-14-2003, 10:10 PM
kwag kwag is offline
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Quote:
Originally Posted by Fiz
If your source movie was not bright to start with and you are using dvd2avi, then another thing to check is the option for YUV-> RGB under video. If this is set to TV Scale then the it seems to make movies brighter when you create the D2V file and use it for encoding. Set it to PC Scale if that is the case.
Or just ignore DVD2AVI's TV/PC setting and add LegalClip() to your AviSynth script. That will make the mpeg file "TV" by clipping the luma levels

-kwag
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  #9  
02-15-2003, 12:30 PM
Kane Kane is offline
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Quote:
Originally Posted by kwag
Or just ignore DVD2AVI's TV/PC setting and add LegalClip() to your AviSynth script. That will make the mpeg file "TV" by clipping the luma levels

-kwag
i used legalclip in my avs script, but the file became as bright as before. the only way i could make it darker was to use
Tweak(Bright=-25)
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