Best strategy to calibrate multi-camera videos?

I am a multi-camera user and would like to know how to calibrate video tracks in Shotcut. I try to adjust the camcorder settings before recording (white balance…) as best I can, but there are always differences. What is the best strategy with Color calibrating filter?
Thank you
Laurent

Are you using the exact same make and model of camera all around?

Not exactly: one Panasonic HC-W850 and one Panasonic HC-V700.

You’re at a disadvantage to begin with using different camera models.

You could get a test chart with color patches on it and use that as a guide. Shoot the same chart under the same lighting with your cameras and fool around with filters such as color grading. It won’t be perfect but might be a starting point.

https://www.bhphotovideo.com/c/product/813250-REG/Kodak_1277144_Gray_Card_Plus_9x12.html

A kind of far-out approach would be to trade in one of your cameras at, say, Adorama and pick up a new second camera that is the exact same model as the other camera in your setup. At least you’d be starting with two identical cameras.

https://www.adorama.com/pages/usedQuote

Both of your cameras have been discontinued so you could pick up two new identical cameras, funds permitting.

You could pick up a pair of these. They are cheap:

https://www.bhphotovideo.com/c/product/1308395-REG/canon_1960c002_vixia_hf_r800_camcorder.html

Thank you for these tips. I’m going to first try color grading.

Another way that you could try:
(Note that if you are starting from scratch, you should definitely also use the method of color patches and white balance as described by @chris319).

Then,
get or create two different LUTS, one for each camera that when applied, will bring them closer to each other.

First do all your cuts between cameras then apply the appropriate LUT to each scene depending which camera it comes from.

Depending on how different the footage between cams looks, you may need some final tweaking.

Note that SC only supports 3DLUTS in .cube format and maybe .dat, .3dl, and .m3d too, but not sure.

A useful video showing this tweaking in action is:

How to create LUTs?

Found this free app: IWLTBAP LUT Generator

Yes I looked at their webpage (https://generator.iwltbap.com/) this morning. They have a great way of creating LUTs by you exporting a frame from a video editor (Shotcut) messing about with it in an image editor then applying those changes to a standard HALD (jpeg or png) that you download from their site. You then export the modified HALD (with no compression)from the image editor and upload it and they compare the differences to generate a LUT - ingenious.

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