(PECL imagick 2.0.0)
Imagick::sepiaToneImage — Sepia tones an image
Applies a special effect to the image, similar to the effect achieved in a photo darkroom by sepia toning. Threshold ranges from 0 to QuantumRange and is a measure of the extent of the sepia toning. A threshold of 80 is a good starting point for a reasonable tone.
TRUE on success.
Throws ImagickException on error.