Function JxlEncoderSetExtraChannelDistance 

pub unsafe extern "C-unwind" fn JxlEncoderSetExtraChannelDistance(
    frame_settings: *mut JxlEncoderFrameSettings,
    index: usize,
    distance: f32,
) -> JxlEncoderStatus

Sets the distance level for lossy compression of extra channels. The distance is as in JxlEncoderSetFrameDistance (lower = higher quality). If not set, or if set to the special value -1, the distance that was set with JxlEncoderSetFrameDistance will be used.

Parameters

• frame_settings: set of options and metadata for this frame. Also includes reference to the encoder object.
• index: index of the extra channel to set a distance value for.
• distance: the distance value to set.

Returns

• JxlEncoderStatus::Success if the operation was successful, JxlEncoderStatus::Error otherwise.