Brighten series of TIFs created with Topaz

[SM1872]

I've a DVD which I've ripped and deinterlaced.

Currently processing through Topaz but the issue is the videos aren't as bright as they should be on the original.

Wondering if anyone can recommend an app which will do it as a batch job before I put the video together again and add sound?

(Edit: Feel free to delete. Found an add-on for GIMP which does the job, although I suspect this will take almost as long as Topaz itself and perhaps brightening during the process of deinterlacing may be the way to go about it. I deinterlaced using Handbrake and I'm not sure how exactly I'd do this. Any tips, I'd be most grateful as I have a full series of seven 25min episodes to go through!)

[pcspeak]

This is what I used for my last attempt for better looking videos. :o)

@echo off
if not exist New\*.* md New

:: Process all MKV videos.
for %%a in ("*.mkv") do call :process "%%a"
goto :end

:process
Title "%~n1"
ffmpeg -i "%~1" -vf eq=brightness=0.06:saturation=1.25 -c:v libx264 -preset slow -crf 20 -c:a copy -c:s copy -threads 0 -y "New\%~n1.mkv"
goto :eof

:end

DEFAULT VALUES FOR eq= FILTER
-vf eq=brightness=0:contrast=1:gamma=1:saturation=1

brightness - range -1.0 to 1.0. The default value is "0".
contrast - range -1000.0 to 1000.0. The default value is "1".
gamma - range 0.1 to 10.0. The default value is "1".
saturation - range 0.0 to 3.0. The default value is "1".

Maybe this will help.
Cheers.

[SM1872]

Thanks for this. I note from searches that Handbreak doesn't deal with this so I won't be able to do it in the deinterlace, so I'll pop it in during the encode and see how we get on. It's a real cult classic that was never and will never be available commercially so I'm looking to do my very best. Fingers crossed.

The GIMP Batch editor has been running for 5 hours and is just over frame 6,600 out of almost 38,000. Add that to the Topaz processing and I think I'd blow out the processor and graphics card! Much appreciated.

[SM1872]

Sorry to come back to this. Realise it's over a month. Broken key, machine at front-door for 3wks, DPD picked up on 4th organised collection day, and not as much as "sorry".

I've VHS-Rip versions of this item. Trying to match DVD content brightness (off-air SVHS, far superior picture, no wobble, no lines at bottom) to that of the far poorer avi files.

Of course in a quest to get it just right I've done many encodes - and each time ended up with something that's not quite right.

However I'm wondering if this is possible.

Wondering if I could screenshot the item at the same frame on both, then somehow measure the brightness on both the VHS-Rip avi and the MKVs pulled from the DVD. Could they possibly be compared to mathematically hit the sweet spot regards brightness?

Or am I barking up the wrong tree completely?

Not even sure if I could post a portion of the screen. It's something that's never been commercially available - and never will be due to rights issues - but I do not wish to annoy those who are kind enough to offer me this bandwidth to ask questions bursting with ignorance!

[Selur]

Currently processing through Topaz but the issue is the videos aren't as bright as they should be on the original.

Since I never used Topaz seriously, I suspect the usual workflow is this:
1. you start with a video clip
2. (optionally deinterlace the video clip and ) you convert the video clip to images
3. you run Topaz over it and get a bunch of images back
4. you convert the images back to video into the target format you want.

Since images are usually RGB and video usually is YUV you have at least 2 YUV<>RGB conversions (in step 2. and 4.) in which you need to use a color matrix.
Also depending what Topaz assumes regarding the luma scaling tv (16-235) or pc (0-255) the images should be adjusted prooriately.

Assuming your source is TV scale (15-235 luma) and so are your images, my guess is that Topaz operates in pc scale and outputs pc scale, you need to take that into account when converting the images to video with tv scale luma and flag the output video accordingly.

Assuming the way I think the workflow is, is correct than if you can share a few before and after (Topaz) images (with bright and dark parts) of the same scenes it should be relatively easy to figure out how to adjust the colors.

If the workflow is differently then my whole assumtions are probably only useful to give hints where to look for problems.

Cu Selur

Ps.: You probably might find something about this on Topazs own forum https://community.topazlabs.com/.

[SM1872]

I have UK/Pal as source and now thinking Topaz may be just over-egging things. Being an absolute noob I thought it could improve things but if I could just convert what's on the DVD and fix colour it would probably be unnecessary. Doesn't seem to handle faces all that well, I've noticed. Bearing in mind it's already been converted into a home-made DVD from cassette and been tidied up there's obviously been something done originally that darkened what I should have. It's a real pity as the item's never been repeated in full and never will be, and I would dearly love to rescue this as well as I can. Unfortunately I'm not the right person to know the ideal steps in order.

Thanks for your response. It's much appreciated and gives me places to go poking my nose in as I try to increase my very limited knowledge.