There is actually.

Free SeMW Auto Levels. I cannot say it will work exactly as you want with your footage. But you can try.

Thanks fifonik for input...

https://www.semw-software.com/en/autolevels/

looking forward to hear how this tool can help.

I think Auto Levels works static. If there are changes in levels and/or color inside one shot, Graide Color Match will do a good job. It's also good to even time lapse shootings.

I've just put on time-line two solid colours (red and green, I know the colour combination is awful) and create nested timeline. Then I returned to parent project and added the SeMW Auto Level to the event. And when playing preview, the resulting colour is some kind of white. Well, not exactly white, the brightness is slightly fluctuating, but the main idea is -- it is not static.

As per "how it can help".

You can adjust the colour temperature of result using options. I used it to make different film scan fragments to have similar "sepia" tint. Original colour and brightness was fluctuating across frames in my case. I cannot say that it was easy. On film scans the noise is affecting the results too much. So on some fragments the plugin failed and I did everything manually at the end.

P.S. Technically speaking you are right: auto levels is not the same as auto white balance.

Hi, I have downloaded Free SeMW Auto Levels, but I think I do not use it correctly.

I am using it in a 20 second fragment, just in the abrupt change of white balance. But the result is that when rendering it modifies everything. Does not match white balance.

I am doing something wrong?

It's just not the right tool. Graide Color Match is a better one for this task. With Graide Color Match you'd need only one correctly balanced reference frame which then can control all the other frames.

If it is fully functional for 21 days without any limitation and without watermark I will have to investigate and then try it, thank you very much.

In any case, the video that J.F the "Graide Color Match" program unifies the colors of different videos.
What I'm looking for isn't exactly that. I want unify a scene with a strong change in white balance.
It will be possible with "Graide Color Match"?

Yes, exactly same is possible if the changes are within one single shot. As mentioned above, Graide Color Match lets one selected reference frame control all the other frames.

riu, Just Pause! Try Aav ColorLab, its incredibly effective at what it does and its White Balance feature is the best there is for Vegas Pro, better than all other options including all other white balance Vegas plugins once you understand it and its free. Grab it here: https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/colorlab/Aav_ColorLab_1_0_rc2_x64.msi

Hello everyone, thank you very much for your help, I am learning a lot.

Finally I downloaded "Graide Color Match", and I did a test but I don't know if I'm doing it the right way.

As you can see in the video, I select a point in the scene where the white balance is correct and then render.

The truth is that the change shows something strange, I do not know if it is normal or it is because I do not do it correctly.

Could you offer one of your source clips for download (via a hoster like Dropbox or Google Drive) so we could try ourself.

Hi, I don't know how to do it correctly but I'm going to try. It is a scene with a change in white balance.

It is right?

https://drive.google.com/file/d/1FDJTP2J4ZCtfB9CwW294efKXJiAB5p6b/view?usp=sharing

In Graide Color Match your first step is to select the correct mode ("Continuous"). Then wait until the reference frame is shown in the FX window.

It works fine here – almost. There will still be a slight level shift left at around 11 sec.

Be aware Graide Color Match analyses and corrects the whole frame if not adjusted else and it takes regard of the majority of chroma which is not the white color in this case. So there is still a shift in the white wall visible but the furnitur with its color will be very even.

If you want the white wall to be your priority you can select only a part of the frame which covers less of the furniture (but don't leave it totally out). It won't be perfect, though. But I tried several tools now and none worked perfect in this particular case (AAV Color Labs totally failed in this case because it does a static processing, Auto Levels isn't bad but the shift is more visible than by using Graide Color Match).

That's what Graide Color Match gives me:

Thank you very much for your help, you are very kind.

Then wait until the reference frame is shown in the FX window.

This has confused me a little. Do I wait for the frame of reference to be displayed automatically?

I select the frame that interests me most so that the scene is equal to it.

I possibly got it wrong.

You do select the reference frame by placing the Vegas Pro timeline cursor where you think the best frame is then click onto the reference frame icon of Graide Color Match. This frame then should appear in Graide Color Match. I think you did it right in the screen recording you've shown above.

Thank you, I think I understand perfectly now.

This is a good system, too bad it is not free.

regards

Hi, I have to apologize to everyone.
The video I sent as a sample was a video that I changed the white balance during the recording, so when we passed "Graide Color Match" we got good results.
Afterwards, I have passed "Graide Color Match" to all the videos and the result has not been as expected.
This is because the problem was not the white balance, the problem is the contrast.
I have discovered that in my camcorder there is an option called active contrast and when activated, the contrast changes depending on some factors.
That's why I noticed a change that I thought was the white balance, but in reality it is the contrast.

Thank you very much anyway for your help and I will try to open a new topic to see the problem.