i read a thread here where during the capture process one can tweak the brigthness and color
i searched for that specific thread but i can seam to find it
i notice that when i play my vcr *hr-s5800u* throught my pc (ati aiw ve) via s-video
the colors look a little pale
should i tweak it a little during capture or leave them
and tweak later on (avisynth maybe or the mpeg encoder)
i have lordsmurf's virtualdub version where i notice that in the proc amp settings (i think it's in the WDM driver) everything is at defaults (128) except the sharpness (201) should i keep it that way ?
i find virtualdub's proc amp ajustment so much easier that avisynth
that would be so much easier for me .. is there some things i should watch out for while teaking ?
i plan to capture huffy (yuy2) and encode for dvd (avstodvd)
jvc hr-s5800u > tbc-1000 > all in wonder ve all with s-video
thank you for your time
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Last edited by smartel; 17th May 2011 at 14:01.
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If you have tapes with color bars it's best to experiment with that
Try with the values below but it might not be optimum, cards have different minimum/maximum values in general
brightness: + 11 units (or 18 max)
contrast: no change
sat: -1 unit
hue : +3 units (or 7 max)
For ntsc vhs tapes only*** DIGITIZING VHS / ANALOG VIDEOS SINCE 2001**** GEAR: JVC HR-S7700MS, TOSHIBA V733EF AND MORE -
they don't have color bars on them
so i guess i'll go with the best skin tones or natural items (sky , grass etc ) for reference
i'll capture the tapes by content not whole tapes
but i guess that the tape recorded with the same machine should have the same balance all over
with each particular tape -
It's possible to fix after the capture process (unlike i see writen often) , take a look capture ; reference ; result (tweaked with avisynth)
If you pay close attention to the histogram they match almost perfectly after my little tweaks.
In my (little) experience tweaks on the fly will not give satisfactory results especially for the phase (hue) there always will be one or two colors not correcly phased, not by a mile but still...And indeed each tape is different to complicate the things further (i have verified this myself as i have tapes with color bars 3 at least , each is different, for the phase mainly slight changes but they're here)*** DIGITIZING VHS / ANALOG VIDEOS SINCE 2001**** GEAR: JVC HR-S7700MS, TOSHIBA V733EF AND MORE -
well ,, seams that tweaking on the fly would give me just another sets of problems
so i guess that i'll have to tweak anyway , so tweaking just one time after the capture should be more than enough
is their an avisynth script that i could just import into avspmod that would give me those kind of sliders ?
(i just bassically use existing script cause i'm very dumb and lazy with avisynth)
and since my tbc-1000 is also a kind of distribution amplifier wouldn't it give me a better signal with less fainted colors ?
and a friend of mine has an handycam DCR-HC20 , it doesn't have a tbc i think,
but would this help me if i worked into dv format instead of avi ?Last edited by smartel; 18th May 2011 at 20:55.
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Here is my script:
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\VideoScope\VScope.dll")
################################################## ################################################## ################################################## ############
function int2mode(int index) { return Select(index, "classic", "levels", "color") } #for HISTOGRAM
Avisource("C:\MyVideo.avi", fourCC="LAGS", pixel_type="YUY2").trim(20,26) # fourc= HFYU for huffyuv / pixel_type: YV12,YUY2,RGB32/24 / trim for image range
AssumeTFF # for interlaced content, top field first
Tweak(3.0,0.9,-7,1.0,coring=false) # For hue, sat, brightness, contrast modifications
ConverttoRGB32(matrix="rec601",interlaced=true)
separatefields() # to separate the fields (interlaced content)
LoadVirtualdubplugin("C:\Program Files\VirtualDubMod\plugins\Hue.vdf", "hsi",1)
hsi(-1, 1, 3, 0, 1) # Red (primary color)
hsi(1, 1, 0, 0, 4) # Blue (primary color)
hsi(0, 1, 5, 0, 2) # Green (primary color)
hsi(0, 1, 7, 0, 32) # Magenta (secondary color)
hsi(0, 1, -4, 0, 8) # Yellow (secondary color)
hsi(1, 1, 1, 0, 16) # Cyan (secondary color)
LoadVirtualdubplugin("C:\Program Files\VirtualDubMod\plugins\colormill.vdf", "colormill",1)
# Colormill for highlight (Levels)
colormill(25700, 25700, 25700, 25700, 23396, 28513, 25700, 25700, 25700, 25700, 25700, 25700, 25700, 1124, 5) # Gives good results with my tapes even for I Q components
weave() # for reinterlacing the fields
ConverttoYV12(matrix="rec601",interlaced=true)
#Levels(7, 1.000, 255, 0, 255, coring=true) # can tweak the levels if needed
ColorYUV(analyze=true)
Histogram(int2mode([<"HistogramMode", 0, 2, 2>])) # Histogram with Slider / You can pick the mode (0,1 or 2)
ConverttoYUY2(interlaced=true) # for VIDEOSCOPE
VideoScope("both", true, "Y") # Videoscope
If you wanna tweak the hsi and colormill values i suggest you do that in virtualdub, save the .vdf and open the .vdf with the notepad then copy/paste the values in the avs script. If you do that you might wanna ignore (put a #) all lines after the converttorgb32 line.
Good luckLast edited by themaster1; 18th May 2011 at 22:11.
*** DIGITIZING VHS / ANALOG VIDEOS SINCE 2001**** GEAR: JVC HR-S7700MS, TOSHIBA V733EF AND MORE -
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ohh yeah !! i'll try to digest all of that , maybe tomorrow if i find time
i just captured a 1989 vhs tape and the colors seamed fine ,
i guess it depends on the quality of the source original tape (polaroïd)
i'll cut it into segments , was taped in 6 h mode ..
the first fourth of the tape was kinda crappy , with tracking errors
i may search for multiple capture averaging if it helps ..
i also have a couple of players that i could bring back to life
and yes , vhs capturing is lots of work , lots of trial and error
and thanks for your help -
Regarding the levels (all simulated images):
Say you record this levels chart with a VHS deck:
If you capture with too much contrast, the darks are too dark, the brights are too bright:
All the darker bars are completely black and all the lighter bars are completely white.
You can't restore any detail in those bars by filtering later on:
Note how the bars around 50 and 55, and 200 and 205, are now restored to nearly their original brightness. But the bars from 0 to 30, and 225 to 255 are gone. There is no way of getting them back.
On the other hand, if you record with too little contrast:
Note how the blacks aren't very black and the whites aren't very bright.
You can stretch the contrast back out by filtering later on:
The levels aren't exactly right, and noise is accentuated, but you can see the darker and lighter bars.Last edited by jagabo; 19th May 2011 at 08:46.
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