Imagick::setImageType

(PECL imagick 2, PECL imagick 3)

Imagick::setImageType — Sets the image type

说明

public Imagick::setImageType ( int $image_type ) : bool

Sets the image type.

参数

image_type

返回值

成功时返回 true。

User Contributed Notes

Simon J 24-Mar-2020 12:55


The different image types that can be specified are (from the Imagick::getImageType doc page):



    Imagick::IMGTYPE_UNDEFINED

    Imagick::IMGTYPE_BILEVEL

    Imagick::IMGTYPE_GRAYSCALE

    Imagick::IMGTYPE_GRAYSCALEMATTE

    Imagick::IMGTYPE_PALETTE

    Imagick::IMGTYPE_PALETTEMATTE

    Imagick::IMGTYPE_TRUECOLOR

    Imagick::IMGTYPE_TRUECOLORMATTE

    Imagick::IMGTYPE_COLORSEPARATION

    Imagick::IMGTYPE_COLORSEPARATIONMATTE

    Imagick::IMGTYPE_OPTIMIZE



The MATTE variants are equivalent to GrayscaleAlpha, etc. in the ImageMagick command line. If you're making something grayscale, I would recommend using IMGTYPE_GRAYSCALEMATTE.



<?php



$im->setImageType(Imagick::IMGTYPE_GRAYSCALEMATTE);



?>

quickshiftin at gmail dot com 04-Oct-2014 06:29


The cleaner way to set the type to grayscale is to use the Imagick class constant.



$oBw = new \Imagick($sSourceImage);

$oBw->setImageType(\Imagick::IMGTYPE_GRAYSCALE);



I've found this to be a rather harsh 'convert to grayscale' approach. Fred's color2gray script works much better, but it's written in Bash. Time to get it ported over lol



http://www.fmwconcepts.com/imagemagick/color2gray/index.php

lee dot traynor at skeptic dot de 19-Oct-2011 01:37


This function can be used to desaturate an image, i.e. to convert a coloured image into a greyscale:



<?php



$im = new Imagick ("image.jpg");

$im->setImageType (2);

//is now in 256 shades of grey



?>