need help with msharpen filter for avisynth 2.5!

[mchipk]

After processing with msharpen filter, I get a wave movement effect on the edges/lines. Is that what you call banding effect? if so how can I fix it?

I've already tried lowering the sharpen strength/threshold to around default setting but the wave movement on the edges/lines still there.(not on the original)

Is there another filter that can correct this problem, and yet keep the same sharpness?

[Guest]

Post a screenshot so I can tell what you are talking about. Thank you.

Better yet, put a source clip on my FTP server, and I'll have look at it.

[mchipk]

@ neuron2

I tried the address ftp://ftp.neuron2.net/
but got a pop up that says "windows cannot access this folder.... " and I don't know how to post a screenshot here. :confused:

I can tell you if I freeze each frame on the original, I see the edges/lines are straight, but after processing with msharpen, some parts of the edges/lines become thinner on one frame and back to normal on the next frame. So if you play the clip, you'll see the edges/lines with a moving wave effect as the frames go alternating the edges/lines from thinner to normal and so on.

[Guest]

Try this:

ftp://guest@ftp.neuron2.net

When the dialog pops up put this as your user name:

guest@neuron2.net

and this as your password:

guest

[mchipk]

Re: ftp://guest@ftp.neuron2.net

I get the same thing, same message, and no user name or password pop up windows to login.

[Guest]

You put this in the address bar of IE6?

ftp://guest@ftp.neuron2.net

And it didn't give you a login dialog box?

That's a strange browser you have.

Try using a real FTP client like CuteFTP.

[mchipk]

Thanks for trying to help, I appreciate it.

But I give up, I just can't get the ftp thing to work.

[Guest]

Are you using IE6?

You put it somewhere and I will download it. :)

[mchipk]

Yes, I'm using IE6. I think I just connected to your FTP, and uploaded the clip in a folder called "VIDEO_TS", it's about 19MB. Not sure if it was a successful upload though.

[Guest]

Consider the left edge of the book with no filtering. Blow it up by 2 in VirtualDub and play it. You can see the waves traveling up the edge. They are there in the source. You applied a sharpening filter. Of course that is going to amplify it.

This clip doesn't needs sharpening. Why are you doing it?

In fact, it is already heavily edge enhanced. Adding more just degrades it further.

[mchipk]

Oops, sorry I think i sent you the one after processing with msharpen.

I'll send you the original.

[Guest]

This looks pretty good to me:

msharpen(threshold=5,strength=85,highq=true)

Remember that all filtering is a compromise. Does it do more damage than good is something you always have to ask yourself. There's nothing perfect, so a light hand is called for.

(BTW, this kind of thing should go in the Usage forum.)

[mchipk]

Ok, neuron2 thanks for your help. ;)

[Didée]

Well I know nothing about your source, but things that might come handy are this (http://forum.doom9.org/showthread.php?s=&threadid=84196&highlight=limitedsharpen) and this (http://forum.doom9.org/showthread.php?s=&threadid=74003&highlight=BlindDeHalo).

[mchipk]

Thanks Didée. ;)