[FCP-L] 10-bit Gradient test image with 1024 code values

hi List!

does anyone know where I can get a test image with a 10-bit gradient that
includes 1024 values (ideally across an image 1024px wide)? I'd like an
image that I can pass trough a pipeline and make sure all 10-bits of color
data are being preserved.

I tried to create this in photoshop, but none of the blending modes create
an image whose code values increase linearly. Maybe theres an easy way to
do this in photoshop that I don't know about.

Thanks!
-Nat

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