Here is a sum of what the new rule change changes:
Old rule (a):
- Only use the colors black (#000000) and white (#FFFFFF)
- Transparency, gradient, and anti-aliasing is not allowed
New rule (b):
- Use any colors in the greyscale. (Any colors in between black and white)
- Transparency, gradient, and anti-aliasing is allowed
You can pick between using the old rule or the new rule.