Sepia and Invert Effects work but why not the rest?

Hi, I’m developing an Image Gen API website and making effects endpoints such as Grayscale, Sepia, Silhouette etc.

I could be wrong here but for some reason, only my Sepia and Invert endpoints are working, when trying to require grayscale, blur, brightness, darkness and the rest. They either result in a black or white generated image. See screenshots and code for what I mean.

Removed links to avoid people copying code since issue was fixed - sorry for the Grayscale code. for Sepia code. Screenshots: https://imgur.com/a/PIxvdls

Using 3.1.0 as the version.

[kyranet]

Have you tried more images in threshold? If almost the entire surface of the image is pastel, threshold simply cannot work due to how its formula works.

For example threshold has 2 arguments, canvas and threshold, where you’d normally do threshold(canvas, 140) in a functional way, you’d do .process(threshold, 140) instead.

[NTMNathan]

I did a test, please see the post in #342