其他类似情况也可以类似处理，譬如背景deint，文字不动，等等。
本脚本就是用于完成这个工作的。
NCPP(clip input, clip nc, clip "pp", string "diffpp", int "repair")
需要三个clip，
一个是原始的OP，
一个是原始的NCOP，
一个是NCOP做过处理后的结果pp。
例如背景要去缟而credit可以不动的情况，用NCPP(OP, NCOP, pp)，就可以将未处理的credit覆盖到处理过的NCOP上，从而得到成品。如图示（感谢四妹试验sample）
原始OP：
原始NCOP：
处理后的NCOP：
最终merge结果：
来看一个实例：
[syntax lang="avisynth" lines="f"]OP = AviSource("OP.avi")
NCOP = AviSource("NCOP.avi")
pp = NCOP.Destripe(360, 4, 3, 3).evenly720(3, 30).Spline64Resize(NCOP.width, NCOP.height)
NCPP(OP, NCOP, pp, "vinverse.Spline36Resize(1920, 1080, 0, -0.5)", 2)[/syntax]
这样就是背景destripe，而字幕部分vinverse的效果。
几个注意事项：
1. 本脚本需要OP/ED与NCOP/NCED有相同的背景画面。
2. 有些pp处理会导致画面被移动，譬如destripe。根据情况可以采用将diff进行同样的移动，或者将pp的画面移回去。前者用法可以参加上面一个例子里的diffpp参数，后者可以直接在定义pp的时候处理，譬如pp=NCOP.Destripe().Spline36Resize(width, height, 0, 0.5)这样。
3. NCOP处理前后，线条边缘常常会出现变化，譬如解缟前线条混乱，占了3pix，而解缟后变成了2pix，直接add diff的话会出现类似jerk的问题。所以本脚本默认开启repair来去除这种add diff过程导致的问题。repair参数的意义就是使用repair时的mode，0为不使用repair处理（如果同时不定义pp的话，默认pp直接取input，得到的结果应该和原始OP完全相同）。默认是和repair里mode一样为2，需要的话自己tweak参数。
下载：碗柜
或者保存下面的脚本：
[syntax lang="avisynth" lines="f" filename="NCPP.avsi"]### Original by 06_taro: http://pastebin.com/L1SAjpYZ
### Script by ssnake & 06_taro
### Tested by 454790560
###
### This script is used in such cases:
### OP/NCOP (and of course EDs) are interlaced/cross-upconved in background, need pp,
### while credits (subtitles) need other pp method, or are progressive.
###
### It requires two clips ("input"/"nc") with same time-line, resolution, and other properties.
### You may use "OP" and "NCOP" for this two clips (in order).
### And a clip of "pp" should be given, which is filtered nc clip.
###
### If destripe moves the clip, say, by 0.5 pixel, move it back (in "pp"),
### or shift diff clip to adjust to pped clip using "diffpp" parameter.
###
### Sometimes pp may changed pixels of edges, resulting in artifacts after mt_adddiff.
### In that case, use "repair" ( indicates "mode" of repair, 0 to disable, 2 by default) to remove them.
###
### e.g.
### OP = AviSource("OP.avi")
### NCOP = AviSource("NCOP.avi")
### pp = NCOP.Destripe(360, 4, 3, 3).evenly720(3, 30).Spline64Resize(NCOP.width, NCOP.height)
### NCPP(OP, NCOP, pp, "vinverse.Spline36Resize(1920, 1080, 0, -0.5)", 2)
###
function NCPP(clip input, clip nc, clip "pp", string "diffpp", int "repair")
{
repair = default(repair, 2)
### get clean credit
diff = mt_makediff(input, nc, u=3, v=3) ### "x y - 128"
diff_Overflow = mt_lutxy(input, nc, "x y - 127 -", u=3, v=3) ### "x y - 128 + 255 -"
diff_Underflow = mt_lutxy(input, nc, "y x - 128 -", u=3, v=3) ### "0 x y - 128 + -"
### process diff
diff = Defined(diffpp) ? eval("diff."+diffpp) : diff
diff_Overflow = Defined(diffpp) ? eval("diff_Overflow."+diffpp) : diff_Overflow
diff_Underflow = Defined(diffpp) ? eval("diff_Underflow."+diffpp) : diff_Underflow
### process interlaced/cross-upconved background
pped = Defined(pp) ? pp : input
### add back credit
adb = pped.mt_adddiff(diff, u=3, v=3).mt_lutxyz(diff_Overflow, diff_Underflow, "x y + z -", u=3, v=3)
rep = ( repair!=0 ) ? adb.Repair(input, repair) : adb
return rep
}
[/syntax]
PS. 其实方法几个月前就写出来了，今天修掉了一个数值溢出的问题，顺便改进了一下。本来因为只用来处理特殊情况所以懒得封装成函数，反正一般ripper不会这么蛋疼吧。感谢ssnake菊苣写成avsi，于是就顺便放出来了。如果上面说的看不懂就Ctrl+W好了……
