A python file to create a series of image files.

create.py

import os
import png
import random

A = 255
B = 127

files_to_create = [
    # 1
    ("baseColor", (A, A, A, 0)),
    ("subsurface", (0, 0, 0, B)),
    # 2
    ("metallic", (B, 0, 0, 0)),
    ("specular", (0, B, 0, 0)),
    ("specularTint", (0, 0, B, 0)),
    ("roughness", (0, 0, 0, B)),
    # 3
    ("anisotropic", (B, 0, 0, 0)),
    ("sheen", (0, B, 0, 0)),
    ("sheenTint", (0, 0, B, 0)),
    ("clearcoat", (0, 0, 0, B)),
    # 4
    ("shadingNormal", (0, 0, A, 0)),
    ("clearcoatGloss", (0, 0, 0, B)),
    # 5
    ("specTrans", (B, 0, 0, 0)),
    # 6
    ("iridescence", (A, A, A, 0)),
    # 7
    ("emissive", (0, 0, 0, 0)),
    ("emissiveStrength", (0, 0, 0, A))
]

dir = "./images/"

name = "whatever"


gradient = True

while name != "thin" and name != "solid":
    name = input("thin or solid?: ")

if name == "thin":
    # 5
    files_to_create.append(("diffuseTrans", (0, B, 0, 0)))
    files_to_create.append(("flatness", (0, 0, 0, 0)))
elif name == "solid":
    # 5
    files_to_create.append(("scatterDistance", (0, B, B, B)))

for f in os.listdir(dir):
    os.remove(os.path.join(dir, f))

for file_name in files_to_create:
    print("Writing: " + dir + file_name[0] + ".png")
    f = open(dir + file_name[0] + ".png", 'wb')
    p = []
    numcols = 2048
    numrows = 2048
    for r in range(0, numrows):
        x = []
        for c in range(0,  numcols):
            if gradient:
                x.append(int(r/numrows * 255) if file_name[1][0] > 0 else 0)
                x.append(int(c/numcols * 255) if file_name[1][1] > 0 else 0)
                x.append(0 if file_name[1][2] > 0 else 0)
                x.append(255 if file_name[1][3] > 0 else 0)
            else:
                x.append(file_name[1][0])
                x.append(file_name[1][1])
                x.append(file_name[1][2])
                x.append(file_name[1][3])
        p.append(x)
    w = png.Writer(2048, 2048, greyscale=False, alpha=True)
    w.write(f, p)
    f.close()