Imagick::getImageOrientation

(PECL imagick 2, PECL imagick 3)

Imagick::getImageOrientation — Gets the image orientation

说明

public Imagick::getImageOrientation(): int

Gets the image orientation. The return value is one of the orientation constants.

参数

此函数没有参数。

返回值

Returns an int on success.

错误／异常

错误时抛出 ImagickException。

发现了问题？

了解如何改进此页面 • 提交拉取请求 • 报告一个错误

＋添加备注

用户贡献的备注 2 notes

down

orrd101 at yahoo dot com ¶

12 years ago

Here's how you can use the getImageOrientation() information to auto-rotate images to their correct orientation...


<?php

// Note: $image is an Imagick object, not a filename! See example use below.

function autoRotateImage($image) {

$orientation = $image->getImageOrientation();


    switch($orientation) {

        case imagick::ORIENTATION_BOTTOMRIGHT: 

$image->rotateimage("#000", 180); // rotate 180 degrees

break;


        case imagick::ORIENTATION_RIGHTTOP:

$image->rotateimage("#000", 90); // rotate 90 degrees CW

break;


        case imagick::ORIENTATION_LEFTBOTTOM: 

$image->rotateimage("#000", -90); // rotate 90 degrees CCW

break;

    }


// Now that it's auto-rotated, make sure the EXIF data is correct in case the EXIF gets saved with the image!

$image->setImageOrientation(imagick::ORIENTATION_TOPLEFT);

}

?>



Example use:


<?php

$image = new Imagick('my-image-file.jpg');

autoRotateImage($image);

// - Do other stuff to the image here -

$image->writeImage('result-image.jpg');

?>

down

holdoffhunger at gmail dot com ¶

12 years ago

Using the getImageOrientation function, you'll get the Orientation value for an image as defined within the EXIF file format.  That means you will get back an integer representation one of the Orientation constants for ImageMagick, which looks like " imagick::ORIENTATION_UNDEFINED", with "_VALUE" values of: undefined (0), topleft (1), topright (2), bottomright (3), bottomleft (4), lefttop (5), righttop (6), rightbottom (7), and leftbottom (8).  When printed out directly, these predefined constants produce the number in parenthesis.  The undefined being set to 0 makes sense, since -- according to Wikipedia -- EXIF allows for eight possible values for an image (and not every image has a set of EXIF properties).

The EXIF Orientation is also called "the Rotation," again, according to Wikipedia: http://en.wikipedia.org/wiki/Exchangeable_image_file_format .  What's the point of that?  According to the official ImageMagick documentation, it's to rotate a photograph so that it is properly oriented after the shot.  This really seems to be a camera thing, since the ImageMagick documentation mentions: "If you pointed your camera almost straight up or down, the EXIF orientation setting may not resolve correctly. The same goes for angled or slanted shots. The orientation (and cameras) just have no senses for these situations." ( http://www.imagemagick.org/Usage/photos/ )

If you're having trouble getting this function to show the value for Image Orientation, then use the function and parameters of getImageProperties('*', FALSE); .  This produces an array of all properties associated with an image, and one of them will have the key value of exif:Orientation.  If it doesn't, then that means you will be getting back a zero from this function, indicating an "Undefined" orientation.

Some sample code :

<?php

// Author: holdoffhunger@gmail.com

        // Imagick Type
        // ---------------------------------------------

$imagick_type = new Imagick();

// Open File
        // ---------------------------------------------

$file_to_grab = "image_workshop_directory/test.jpg";

$file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');

// Grab File
        // ---------------------------------------------

$imagick_type->readImageFile($file_handle_for_viewing_image_file);

// Get Orientation Values
        // ---------------------------------------------

$imagick_orientation = $imagick_type->getImageOrientation();

    switch($imagick_orientation)
    {
        case '0':
$imagick_orientation_evaluated = "Undefined";
            break;

        case '1':
$imagick_orientation_evaluated = "Top-Left";
            break;

        case '2':
$imagick_orientation_evaluated = "Top-Right";
            break;

        case '3':
$imagick_orientation_evaluated = "Bottom-Right";
            break;

        case '4':
$imagick_orientation_evaluated = "Bottom-Left";
            break;

        case '5':
$imagick_orientation_evaluated = "Left-Top";
            break;

        case '6':
$imagick_orientation_evaluated = "Right-Top";
            break;

        case '7':
$imagick_orientation_evaluated = "Right-Bottom";
            break;

        case '8':
$imagick_orientation_evaluated = "Left-Bottom";
            break;
    }

// Print Orientation Values
        // ---------------------------------------------

print("# $imagick_orientation - $imagick_orientation_evaluated");

?>

＋添加备注

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

有任何技术问题请点击这里网站运营推广招聘

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

php7.3 使用 PDO_DM 扩展连接 DM8 中文乱码 PhpStorm中PHP注释的规范指南使用PHPWord将docx文件转换为html格式 docker-compose启动nginx与php-fpm laravel查看orm生成的sql PHPStorm ESC 会退出命令行 composer install参数 laravel orm中DB::insert方法导致内存泄漏的问题解决方法 php7 安装fileinfo扩展 adodb手册 ADORecordSet对象常用的php ADODB使用方法集锦利用php soap实现web service ADOConnection 公用函数 adodb连接mysql多个数据库的问题 PHP json解析（json_decode）页面工具 PHP注释规范 mysql面试题 Composer的Packagist资源 [PHP] inet_pton/inet_ntop IP地址转换函数

略微加速

PHP官方手册 - 互联网笔记

Imagick::getImageOrientation

说明

参数

返回值

错误／异常

发现了问题？

用户贡献的备注 2 notes