Imagick::getImageType

(PECL imagick 2, PECL imagick 3)

Imagick::getImageType — Gets the potential image type

说明

public Imagick::getImageType(): int

Gets the potential image type.

参数

此函数没有参数。

返回值

Returns the potential image type.

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

错误／异常

错误时抛出 ImagickException。

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User Contributed Notes 2 notes

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holdoffhunger at gmail dot com ¶

10 years ago


This function will return an integer, with that value being equal to the evaluated value of the IMGType Constants as defined by the ImageMagick class.  When accessing them, they look like "imagick::IMGTYPE_PALETTE", but with "_VALUE" values of: undefined, bilevel, grayscale, grayscalematte, palette, palettematte, truecolor, truecolormatte, colorseparation, colorseparationmatte, and optimize.  If you were to print out these values, you would have '0' for undefined, '1' for bilevel, '2' for grayscale, and so on.

For a BMP picture drawn in paint, I got back the value # 4 - Palette.  For a BMP or JPEG photograph of the ocean or jungle, I got back the value # 6 - Truecolor.  For an animated GIF file, I got back the value # 5 - Palette Matte.  For a black-and-white JPEG drawing, I got back the value # 2 - Grayscale.  These are the most common results I have gotten back with this function.

Some sample code :

<?php

            // Author: holdoffhunger@gmail.com
    
        // Imagick Type
        // ---------------------------------------------

    $imagick_type = new Imagick();
    
        // Open File
        // ---------------------------------------------
        
    $file_to_grab = "image_workshop_directory/test.bmp";
    
    $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');
    
        // Grab File
        // ---------------------------------------------

    $imagick_type->readImageFile($file_handle_for_viewing_image_file);
    
        // Get Image Type Value
        // ---------------------------------------------
        
    $image_type = $imagick_type->getImageType();
    
        // Interpret Image Type Value
        // ---------------------------------------------

    switch($image_type)
    {
        case imagick::IMGTYPE_UNDEFINED:
            $image_type_title = "Undefined";
            break;
            
        case imagick::IMGTYPE_BILEVEL:
            $image_type_title = "Bilevel";
            break;
            
        case imagick::IMGTYPE_GRAYSCALE:
            $image_type_title = "Grayscale";
            break;
            
        case imagick::IMGTYPE_GRAYSCALEMATTE:
            $image_type_title = "Grayscale Matte";
            break;
            
        case imagick::IMGTYPE_PALETTE:
            $image_type_title = "Palette";
            break;
            
        case imagick::IMGTYPE_PALETTEMATTE:
            $image_type_title = "Palette Matte";
            break;
            
        case imagick::IMGTYPE_TRUECOLOR:
            $image_type_title = "Truecolor";
            break;
            
        case imagick::IMGTYPE_TRUECOLORMATTE:
            $image_type_title = "Truecolor Matte";
            break;
            
        case imagick::IMGTYPE_COLORSEPARATION:
            $image_type_title = "Color Separation";
            break;
            
        case imagick::IMGTYPE_COLORSEPARATIONMATTE:
            $image_type_title = "Color Separation Matte";
            break;
            
        case imagick::IMGTYPE_OPTIMIZE:
            $image_type_title = "Optimize";
            break;
    }
    
        // Print Image Type Value
        // ---------------------------------------------
        
    print("# $image_type - $image_type_title");

?>

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lukeydeluxe at gmail dot com ¶

13 years ago


Remember, the result, if successful, is an Array, wich means you should call for example "$var[format]" if you want to know what format the file uses.

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

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Imagick::getImageType

说明

参数

返回值

错误／异常

User Contributed Notes 2 notes