Is it wise to capture VHS a little more sharp if you want to denoise after

[25FPSBB]

Hi there i am new here. I do capturing Video - Laserdisc for 20 years now. 15 years ago i started to capture with pc in uncompressed mode and than i used Avisynth - Neatvideo. I have 3 vcrs with TBC a DVD-VHS combi for Secam-L an external frame TBC some procamps... Than i stopped my hobby for some years but last year after i bought a Diamond VC500 usb capture device i started again capture in Lagarith with AmarecTV. To work with Avisynth i always was reading here and over at videohelp to get it to work. My captures are most of the time PAL (i am from germany). But sometimes i do Secam-L too (hate it). I was thinking i am not good enough to go here but after i had a small conversation over at youtube with lollo5468 what helped me a lot. I was thinking ok to get better i go to Doom9 and i ask the hotshots.

So here is my small first question. I made a capture of a very dark not sharp tape after i was ready i fixed the gamma - picture was good details in dark wich were lost are back again but black had still to much noise after Temporaldegrain2 and a little DeHalo_Alpha. So i made a new capture with high contrast and sharp setting (80). Used the same settings in my script for Teporaldegrain2.. Now i am very pleased with my result. Gamma is ok many details lost in the dark are there noise is gone and the sharpness is good too for what it was before. Is it wise to capture more sharp if you want to get more details out of the picture, especially if the movie is widescreen on VHS and you want a anamorphic DVD or a MKV. It was the first time i did this, maybe others do it too and have more experience.

[Emulgator]

If it is good for you, it is good.
Anyone else's judgment would need "a sample please".

[lollo2]

Originally Posted by 25FPSBB

Hi there i am new here.

Welcome!

As Emulgator wrote, post a sample of your capture, so we can check the levels and the rest, and then find the appropriate processing

Just as a reminder, remeber to stay inside the "capturable" range of your card, by tuning the procamp if needed.

According to the different versions of the VC500 it could be 16-254 or 0-252 IIRC (or if you want to be in the safe side capture inside the "legal" YUV range 16-235)

[25FPSBB]

Hello lollo2 tested it out with other VHS tapes and as Emulgator wrote it was good for me but only with this one specific tape. All test i did after i had not the same result. Ended up with artifacts on bright parts and halos on the edges of the picture after denoising. So this way is only good if you have a very dark not so much noisy tape. Maybe it works with svhs captures better but my tapes are all standard vhs. Next time when i have a question i up a sample before - after with my script.

[Emulgator]

This matches what I would have expected.
Under your given circumstances (blurred source) the sharpening might match the source and all is well.
With other "normal" sources sharpening in proc amp could be detrimental, so should be avoided.
(Often it is a few-tap 1-dimensional convolution which adds halos and exaggerates unwanted noise as well, harder to remove afterwards)
Just capture as-is, uncompressed, with max bitness and min subsampling,
As lollo2 suggested, use any given procamp to match, delivering unclipped analog signal to the Video ADC
and do all elevated processing in post.
AviSynth lets you call anything you desire, dehaloers, sharpeners, you name it.