Set the value Specify the x coordinate (in layer image coordinates).
y
Set the value Specify the y coordinate (in layer image coordinates).
value
Specify the value to be set (0 to 255).
戻り値
なし (void)
説明
Set a value (0 to 255) at an arbitrary position in the layer mask image (image retaining opacity).
Specifying an invalid (out of range) location as an image coordinate will raise an exception.