Fully working configurable broadcast safe limiter

[Jarek5C9E]

Hello everyone! I wonder why in Premiere Pro there isn't such thing like effectively working safe color limiter. Something similar to this one from Media Composer. There are 2 plugins (effects) but they simply don't work. I've tried to use them with many different variations of settings (luma-chroma) but every time percentage of pixels with luma exceeding ire levels were too high, so my workflow looked like this - export mxf file from premiere pro (encoder), import (most often ama link) to media composer and export from media composer with safe color limiter applied (settings were the same or very similar). And in this moment final mxf is really broadcast safe. Really?? Is that really has to be? This is Premiere Pro 15.2. 15th version of quite good program for video editing which DOESN'T HAVE tools to make technically good file for broadcasters.

[R Neil Haugen]

Have you tried the limiter in the Export dialog?

Neil

[Jarek5C9E]

Hi Neal, sure I have. I found your post with another tip (black and white mattes) and testing it right now, legacy limiter set 0-100 luma and -30-130 chroma and exporting xdcam HD 422 50. Smart setting didn't worked, many spikes appeared below 0 and over 100. Long drone city shot... I wonder why those spikes appeared after export and when I checked levels on scopes before export they seemed to be ok. It seems to happen after render process...

[Jarek5C9E]

Neil... Sorry for that...

[R Neil Haugen]

I sometimes can get spikes also, especially if there's a graphic with sharp edged text or sharpening of anything involved. Can be frustrating.

Neil

[Jarek5C9E]

I put three photos here. First - exported mxf, second - sequence with limiter and mattes applied, third - masterclip.

 

 

 

[TillP]

I am experiencing this sub-black spikes in contrasty graphics as well ... also the reds are waay too saturated, even after applying limiter and compressions. These Limiters (in Prremiere and AME) don't deserve their name at all. So frustrating. What would be your suggestion? 

[Jarek5C9E]

Hello, sorry to say that but usually I use Avid MC broadcast safe color limiter to be sure that my export video is legal (import mixed video to Avid, apply limiter, export). If you haven’t MC you can use limiter from Resolve. I’ve heard it’s very good.

Regards

Jarek

[R Neil Haugen]

This is entirely possible ... I've noticed sub-blacks induced within PrPro in three different ways.

First, lifting any value in Lumetri Luma v Sat or Sat v Sat panels above the middle starting point if you have any values down near black in the image.

Second, sharpening especially if there are text items or there are sharp lines of strong contrast in the image.

And third, some graphics/mogrts with text.

And the limiting processes available to us users don't always simply cut all sub-blacks.

@TrentHappel  @WesHowellPPro and @mattchristensen  ... anyone with ideas? Help?

Neil

[chrisw44157881]

you can roll your own. apply adjustment layer on video, set its composite mode to lumanance with levels( black output 16, whiteoutput 235)

and then another layer composite mode set to color, levels effect (R,G,B, each white outputs to 204)

This will statically fix all colors inside the vectorscope boundry boxes.

bonus, apply a curve just before the luma levels and get a nice highlight rolloff.

[Jarek5C9E]

Yeah, I tried that either. In MC this cc preset works like a charm but here in PP - no. This preset limits color gamut to 16-235 (8 bits). Maybe this is it, maybe the problem is in changing color space?

[chrisw44157881]

i think you can use lumetri rgb curves the same way. their endpoints act like input and output.

colorspace would be rec. 709 broadcast (usually)