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Old 30th August 2014, 13:06   #1  |  Link
killerteengohan
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Raising saturation without the colors messing up?

I have a source that the colors look very dull or washed out. I was going to increase it slightly by using Tweak(sat=1.05)

I noticed when using this though that on all the blacks or dark colors you can see green spots and or rainbow like colors showing up and moving around on the source. It seems to add a green tint to blacks. When I turn the tweak back off, the colors go back to normal.

This does this even if I raise the saturation even the smallest bit like tweak(sat=1.01) and its very visible and annoying.

Using a derainbow filter doesn't help at all. Is there an alternative method for increasing saturation using avisynth?



Heres screenshots of the issue I'm talking about. This scene isnt as washed out or dull as the other scenes I want to use tweak for but it shows what I'm talking about if you look at the black or darker colors like their shirt.


NO SATURATION INCREASE




WITH TWEAK SAT=1.04




NO SATURATION INCREASE




WITH TWEAK SAT=1.04


Last edited by killerteengohan; 30th August 2014 at 13:17.
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Old 30th August 2014, 16:06   #2  |  Link
raffriff42
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I have a script that allows you to Tweak (or anything else) the midrange tones only, leaving highlights and lowlights alone:
Code:
## Last = YUV

## DEMO - FRAME STEP ONLY
return Interleave(
\   Subtitle("org"),
\   Tweak(sat=1.5) /* exaggerated for testing */
\     .Subtitle("Tweak"),
\   MergeLMH(C_mid=Tweak(sat=1.7)) /* same apparent sat (+/-) */
\     .Subtitle("MergeLMH"),
\   Subtitle("org")
\ ).Loop(3).Histogram("color2")

#######################################
### merge Lo, Mid, Hi clips based on clip "C" luma
### requires MaskTools v2
##
## @ xover_x   - aproximate 50% luma blend between ranges 
##                  default 102 (40%), 191 (75%)
## @ showmasks - if true, show original + 3 masks in quad split
##
function MergeLMH(clip C, clip "C_lo", clip "C_mid", clip "C_hi",
\           float "xover_lomid", float "xover_midhi",
\           bool "showmasks")
{
    xlo   = Min(Max(  0, Default(xover_lomid, 102)), 127) * 3.0 / 256
    xhi   = Min(Max(128, Default(xover_midhi, 191)), 255) * 3.0 / 256
    showmasks = Default(showmasks, false)

    ## (mt_lutxyz too slow; use mt_lut x3)

    mask_lo  = C.mt_lut(
    \   yexpr="x -0.01 * "+String(xlo)+" + 256 * ",
    \   u=-128, v=-128)
    
    mask_hi  = C.mt_lut(
    \   yexpr="1 x -0.01 * "+String(xhi)+" + - 256 * ",
    \   u=-128, v=-128)
    
    mask_mid = mt_lutxy(mask_lo, mask_hi, 
    \   "x  y + -1 * 256 + ", 
    \   u=-128, v=-128)

    R = C
    R = (!IsClip(C_lo))  ? R : R.Overlay(C_lo,  mask=mask_lo)
    R = (!IsClip(C_mid)) ? R : R.Overlay(C_mid, mask=mask_mid)
    R = (!IsClip(C_hi))  ? R : R.Overlay(C_hi,  mask=mask_hi)
    
    return (showmasks==false) ? R
    \  : StackVertical(
    \       StackHorizontal(C, mask_lo),
    \       StackHorizontal(mask_mid, mask_hi)
    \    ).BilinearResize(C.Width, C.height)
    \     .Subtitle("Low",    align=9)
    \     .Subtitle("\nMid",  align=4, lsp=0)
    \     .Subtitle("\nHigh", align=6, lsp=0)
}
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Old 31st August 2014, 04:14   #3  |  Link
Mystery Keeper
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If you look carefully - you'll see that color issue is present in the source. You just amplify it by rising saturation. Don't know how to fight it, but I would try tempo-spatial denoising (3D DFTTest with motion compensation) and then ordered dithering before applying saturation tweak.
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Old 31st August 2014, 08:43   #4  |  Link
cretindesalpes
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Using Tweak(param…, dither=true) may help to fix this kind of artefact.
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Old 31st August 2014, 15:44   #5  |  Link
bxyhxyh
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If neuron2 was here, he would've ask about how did you obtain your source.
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Old 31st August 2014, 16:07   #6  |  Link
feisty2
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Quote:
Originally Posted by bxyhxyh View Post
If neuron2 was here, he would've ask about how did you obtain your source.
he's gone, you don't gotta be mean
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Old 31st August 2014, 18:28   #7  |  Link
asarian
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Quote:
Originally Posted by feisty2 View Post
he's gone, you don't gotta be mean
LOL. Neuron2 is gone?! My, I really *have* been off this world for a spell!
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Old 31st August 2014, 18:31   #8  |  Link
asarian
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Quote:
Originally Posted by Mystery Keeper View Post
If you look carefully - you'll see that color issue is present in the source. You just amplify it by rising saturation. Don't know how to fight it, but I would try tempo-spatial denoising (3D DFTTest with motion compensation) and then ordered dithering before applying saturation tweak.
Agree with this, actually. You can clearly see it's already present in the source. I dunno, maybe a wee hue-shift on the blacks would work?
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Old 1st September 2014, 01:59   #9  |  Link
feisty2
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Quote:
Originally Posted by asarian View Post
LOL. Neuron2 is gone?! My, I really *have* been off this world for a spell!
neuron2 just left the forum lately all the sudden, nobody knows why he left, the Guest user used to be neuron2
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Old 1st September 2014, 12:41   #10  |  Link
killerteengohan
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I havent seen neuron2 in a while
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Old 2nd September 2014, 04:50   #11  |  Link
killerteengohan
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okay well the solution to my problem was use a filter called smoothtweak(saturation=1.04) or to use ColorYUV(cont_u=10, cont_v=10)

it did exactly what I wanted and the greens I was seeing didn't change or become more visible. I went with the smoothtweak.
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