If your video colors look different after uploading to Sendspark, this is likely the reason:

Sendspark videos get converted to a standard format (H.264) to make your video playable on any device (Mobile and Desktop, Window, Android, Mac, TV, any others).

If your original video was using HVEC or another non-standard codec, then it is possible to see color changes when videos are converted.

We recommend recording videos with a standard codec (H.264) avoid color changes. Here are instructions to change the video capture codec.
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For more information about HEVC code issues just search in google and you will find a lot of similar issues:
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