Imagick::getImageChannelDepth
Imagick::getImageChannelExtrema
The Imagick class
PHP Manual

# Imagick::getImageChannelDistortion

(PECL imagick 2.0.0)

Imagick::getImageChannelDistortion — Compares image channels of an image to a reconstructed image

### Descrição

float Imagick::getImageChannelDistortion ( Imagick `$reference` , int `$channel` , int `$metric` )
Aviso

Esta função não está documentada; somente a lista de argumentos está disponível.

Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.

### Parâmetros

`reference`

  Imagick object to compare to.

`channel`

  Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Defaults to `Imagick::CHANNEL_ALL`. Refer to this list of channel constants.

`metric`

  One of the metric type constants.

### Valor Retornado

Retorna `TRUE` em sucesso.

### Erros

Dispara ImagickException em erro.

Imagick::getImageChannelDepth
Imagick::getImageChannelExtrema
The Imagick class
PHP Manual