Imagick::setImageType

(PECL imagick 2, PECL imagick 3)

Imagick::setImageType — Sets the image type

Descrizione

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

Converts the image to the given type, which combines a color model with the presence or absence of an alpha channel. Depending on the type, this may change the colorspace, quantize the colors, or change whether the image has an alpha channel.

Imagick::setImageType() modifies the image itself. To set the type that subsequent images are written with instead, use Imagick::setType().

Elenco dei parametri

image_type

One of the imagick::IMGTYPE_* constants. imagick::IMGTYPE_UNDEFINED and imagick::IMGTYPE_OPTIMIZE convert nothing, but are still recorded on the image.

Valori restituiti

Restituisce true in caso di successo.

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User Contributed Notes 3 notes

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2
quickshiftin at gmail dot com
11 years ago
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
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1
Simon J
6 years ago
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);

?>
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0
lee dot traynor at skeptic dot de
14 years ago
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

?>
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