You can make a custom LUT in photoshop from CC2015 on.The funny part of all is that I've been working with Photoshop for almost 22 years. But the knowledge I've been gathering ever since cannot be applied to video footage as well. At least not the way I like.
Basically, screenshot representative frame(s), import into Photoshop.
Make New adjustment layer (Look Up Table option should be present).
Make basic adjustments and export as LUT.
With practice this takes a couple of minutes to do.
You are mainly limited to contrast, levels, curves and saturation and colour balance - nothing complex like grads. However grads can be applied in other ways.