C Implementation doesn't produce "best looking" blurhash

[hannojg]

I have just compared the blurhash TypeScript module and the C module (I was about to write a blurhash node module based on the C implementation for performance). The two blurhashes from the modules look different:

C Implementation	TS implementation (better)
Has a dark spot in the top left corner	matches the image really well
LTEfiu4UEe-p0M-oxuRQnhtkRQR*	UEE:Ct005i~C00^%%MIUr;%yMyNG^R9uRP%M

The original image used, with x: 4, y: 3 components:

Can someone explain the difference? Shouldn't the both modules create (nearly) the same output? I think that the result from the TS implementation looks better and the result from the C module should match this.

[Wunkolo]

Just a guess, but something tells me it either has to do with sRGB<->Linear color-space conversions or an issue with image addressing causing it to alias the color samples differently.

[windrunner414]

typescript generate a larger hash(28 vs 36), it's strange