need a luminosity changing script / plug-in

[Forensic]

I need some way to change all pixels below a threshold value to pure black (or I can work with "above a threshold to pure white") while leaving everything else alone. I prefer to work in RGB, but can work with planar if that is my only solution. This is to clean up a mask image. Any suggestions would be greatly appreciated.

[feisty2]

couldn't be easier
let's say u wanna set pixels below 32 to 0
mt_lut ("x 32 < 0 x ?")
to convey rgb on yuv colorspace without converting
r=showred ("y8") #or yv12 if u run into troubles with some filters
g=showgreen ("y8")
b=showblue ("y8")
interleave (r,g,b)
#filters here#
mergergb (selectevery (3,0),selectevery (3,1),selectevery (3,2))

[Forensic]

Feisty2. Thank you for the quick response. I pride myself on self-sufficiency, but I can't find supportive documentation and am definitely misunderstanding something. I have Masktools2 for AviSynth 2.5.8 (I must use 2.5.8 due to other legacy filters). For simplicity, let's assume I have a one frame planar file in the variable SOURCE. What would be the actual lines of code to set every pixel with a Y below 32 to pure black?

[feisty2]

mt_lut ("x 32 < 0 x ?", y=3, u=-128, v=-128)


EDIT: it should work, what kind of error happened there, on your computer, avs 2.5.8 got no support for y8, if some error about y8 appears, just replace y8 with yv12

[Forensic]

You are a rock star! Thank you.

[StainlessS]

I have Masktools2 for AviSynth 2.5.8 (I must use 2.5.8 due to other legacy filters).

What legacy plugz are the problem ? (I'm not aware of any v2.58 plugz that fail in v2.6)

[colours]

mt_binarize exists and is always faster than the LUT alternative.

mt_binarize(threshold=10,mode="x 0")

[Reel.Deel]

I have Masktools2 for AviSynth 2.5.8 (I must use 2.5.8 due to other legacy filters)
What legacy plugz are the problem ? (I'm not aware of any v2.58 plugz that fail in v2.6)

Ditto