public function testValues()
{
$values = [MonoImageFilter::CCITT_FAX_ENCODE, MonoImageFilter::FLATE_ENCODE, MonoImageFilter::RUN_LENGTH_ENCODE];
$this->assertEquals($values, MonoImageFilter::values());
}
/**
* Set monochrome image filter
*
* @param string $monoImageFilter
*
* @throws \InvalidArgumentException
*
* @return $this
*/
public function setMonoImageFilter($monoImageFilter)
{
$monoImageFilter = ltrim($monoImageFilter, '/');
if (!in_array($monoImageFilter, MonoImageFilter::values())) {
throw new \InvalidArgumentException('Invalid monochrome image filter argument');
}
$this->setArgument(sprintf('-dMonoImageFilter=/%s', $monoImageFilter));
return $this;
}