Imagick::setResolution

(PECL imagick 2, PECL imagick 3)

Imagick::setResolution — Sets the image resolution

说明

public Imagick::setResolution(float $x_resolution, float $y_resolution): bool

Sets the image resolution.

参数

x_resolution: The horizontal resolution.
y_resolution: The vertical resolution.

返回值

成功时返回 true。

注释

Imagick::setResolution() must be called before loading or creating an image.

参见

Imagick::setImageResolution() - Sets the image resolution
Imagick::getImageResolution() - 获取图像的x,y轴分辨率

add a note

User Contributed Notes 2 notes

down

sualk at lednew dot de ¶

12 years ago


This method uses the "convert -density {$x_resolution}x{$y_resolution}" parameter. However be aware, that Imagick::setResolution() is much more alike the "convert -density" option than Imagick::setImageResolution()

It's very irritating that both Imagick::setResolution() and Imagick::setImageResolution() are introduced with "Sets the image resolution."

Use Imagick::setResolution() prior to reading a raster image. This method does not affect an image. However this method tells the image to which size it has to be sized in relation to images inherent resolution! With this method you are able to affect the real pixel-size of an image after reading. E.g. your image has a size of 100x100 pixels and an inherent resolution of 72. Setting the Resolution to 144 and reading this image results in a new image size of 200x200 pixels.

<?php
$im = new Imagick();
$im->setResolution(144,144);
$im->readImage("test.eps");
$im->setImageFormat("png");
header("Content-Type: image/png");
echo $im;
?>

Use Imagick::setImageResolution() to alter the resolution of an already read image. This method does not actually change the size of an image, but has influence to methods, which depends on a given image resolution like Imagick::resampleImage(). E.g. your image has a size of 100x100 pixels and a resolution of 72. Setting ImageResolution to 144 does nothing, unless you are resampling image afterwards in relation to the ImageResolution you set!

<?php
$im = new Imagick();
$im->readImage("test.eps");
$im->setImageResolution(144,144);
$im->resampleImage  (288,288,imagick::FILTER_UNDEFINED,1);
$im->setImageFormat("png");
header("Content-Type: image/png");
echo $im;
?>

which actually does the same like

<?php
$im = new Imagick();
$im->readImage("test.eps");
$im->setImageResolution(72,72);
$im->resampleImage  (144,144,imagick::FILTER_UNDEFINED,1);
$im->setImageFormat("png");
header("Content-Type: image/png");
echo $im;
?>

down

carter dot sharon at gmail dot com ¶

11 years ago


If you are reading or creating a new image and want to set the resolution you need to set the Image Units. Undefined image units will cause imagick to use the default resolution (72x72).

<?php
$img = new Imagick();
    
$img->setResolution(300,300);
$img->newimage(100,100,'none');    
$img->setImageFormat('png');
// imagick::RESOLUTION_UNDEFINED  imagick::RESOLUTION_PIXELSPERINCH  imagick::RESOLUTION_PIXELSPERCENTIMETER

$img->setImageUnits(imagick::RESOLUTION_PIXELSPERINCH);

print_r($img->identifyImage());
    
?>

Output 
Array (
[resolution] => Array ( [x] => 300 [y] => 300 ) 
[units] => PixelsPerInch 
)

add a note

官方地址：https://www.php.net/manual/en/imagick.setresolution.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 Packagist / Composer 中国全量镜像 PHP获取指定函数定义在哪个文件中及行号 PHP mkdir()写出来的权限与mode值不符合常用的php ADODB使用方法集锦 adodb连接mysql多个数据库的问题

略微加速

PHP官方手册 - 互联网笔记

Imagick::setResolution

说明

参数

返回值

注释

参见

User Contributed Notes 2 notes