Single-Material MacBeth Chart?

[KickAir_8P]

@pixelgrip

. . . i have looked at blend file.Nice node group.I have not looked at the values,but i noticed that you put your generated colors into the principled shader,which has by default a specular with a IOR of 1.5 active.
For more angle independent albedo reflections of the colors i would just use a diffuse shader for this reason.

Anybody here know the specular IOR of “matte paint applied to smooth paper” on a cardboard backing? Asking the duck hasn’t helped. Or should I use a Diffuse BSDF node like @pixelgrip has kindly suggested?

Quick reminder that the colors in the ColorRamp stops are copied’n’pasted hexcodes from the Wikipedia article – reasonably accurate, but this thing’s not intended to be more than a familiar but lite check-card that can be added to several hundred material test blendfiles with minimal bloat and without an image texture that could get lost. I don’t mind making it as accurate as feasable, but don’t wanna go overboard.

On that note:

@pixelgrip

I believe in hex values if they are gamma corrected to linear,like all sRGB images gets converted to linear for the linear working space . . .

My earlier nodetree vs image texture test seems to indicate that Blender handles any corrections the same for both – if that’s true then it doesn’t seem like I need to worry 'bout this, yes?