Returns a tone <= [tone
] that ensures [ratio
].
Return value is between 0 and 100.
Returns -1 if [ratio
] cannot be achieved with [tone
].
Returns a tone <= [tone] that ensures [ratio].
Return value is between 0 and 100.
Returns 0 if [ratio] cannot be achieved with [tone].
Returns a tone >= [tone
] that ensures [ratio
].
Return value is between 0 and 100.
Returns -1 if [ratio
] cannot be achieved with [tone
].
Returns a tone >= [tone
] that ensures [ratio
].
Return value is between 0 and 100.
Returns 100 if [ratio
] cannot be achieved with [tone
].
Returns a contrast ratio, which ranges from 1 to 21.