Inputs
Color stops are placed at even intervals. With three colors, for example, they
appear at
0%, 50%, and 100%. A single color produces a solid fill rather
than a gradient.
Use CSS-compatible color strings such as #ff006e. Linear angles are
normalized to one full rotation before rendering. Angle is hidden for a
radial gradient, which is centered in the image.
Output
JPEG and WebP are encoded at quality
90. PNG uses its normal lossless
encoding.
Example: make a three-color background
Set the size to1600 by 900, choose linear, set Angle to 135, and
add these color stops in order: