php教程

Imagick::getImageColors

(PECL imagick 2.0.0)

Imagick::getImageColors — Gets the number of unique colors in the image

说明

Imagick::getImageColors ( void ) : int

Gets the number of unique colors in the image.

返回值

Returns an integer, the number of unique colors in the image.

User Contributed Notes

amaral dot regis at hotmail dot com 03-Apr-2018 01:27
O exemplo anterior apresentou números fracionados nas chaves da variável $frequency_list_of_values:

Array
(
    [1 / 0 / 1] => 157295
    [0.83529411764706 / 0.87843137254902 / 0.82352941176471] => 1
    [0.80392156862745 / 0.84705882352941 / 0.7843137254902] => 2
    [0.8156862745098 / 0.84705882352941 / 0.78823529411765] => 1
...

Ent?o eu fiz uma altera??o que melhora o resultado para quem esta buscando saber quais as cores dominantes na imagem, mostrando a chave com o valor rgb exato:
<?php

        $file_to_grab_with_location = $imagepath; //caminho relativo ao arquivo de imagem

        $imagick_type = new \Imagick();

        $file_handle_for_viewing_image_file = fopen($file_to_grab_with_location, 'a+');
        $imagick_type->readImageFile($file_handle_for_viewing_image_file);

        $frequency_list_of_values = array();

        $image_resolution_width = $imagick_type->getImageWidth();
        $image_resolution_height = $imagick_type->getImageHeight();

        print("Image Resolution:  Width - $image_resolution_width / Height - $image_resolution_height<br><br>");

        for($y = 0; $y < $image_resolution_height; $y++)
        {

            for($x = 0; $x < $image_resolution_width; $x++)
            {

                $pixel_to_examine = $imagick_type->getImagePixelColor($x,$y);

                if(isset($frequency_list_of_values[$pixel_to_examine->getColorAsString()]) == TRUE)
                {
                    $temp = $frequency_list_of_values[$pixel_to_examine->getColorAsString()];
                    $temp++;
                    $frequency_list_of_values[$pixel_to_examine->getColorAsString()] = $temp;
                }
                else
                {
                    $frequency_list_of_values[$pixel_to_examine->getColorAsString()] = 1;
                }
            }

            arsort($frequency_list_of_values);
        }

        print("<pre>");
        print_r($frequency_list_of_values);
        print("</pre>");

?>

Resultado:
Image Resolution: Width - 1965 / Height - 998

Array
(
    [srgba(255,0,255,0)] => 451654
    [srgb(54,52,53)] => 281069
    [srgb(177,51,54)] => 130449
    [srgb(236,50,55)] => 64001
...

O método é demorado para imagens muito grandes, pois ele analisa pixel a pixel.
holdoffhunger at gmail dot com 06-Apr-2012 10:54
I've had difficulty getting this function to return the number of unique colors.  Also, I wanted to be able to have an array with each $key value being the RGB of the pixel, and each $value value being the number of times that pixel occurs.  Basically, a frequency list.  For example, you would have "1 / 0 / 0" for red as a $key value, and "25" for the number of times that pixel color was in the image.  So, I wrote some code to do that, using a combination of readImageFile, getImageWidth, getImageHeight, getImagePixelColor, and a simple x/y parser, like so :

<?php

        // Test File
        // ---------------------------------------------

            // Note: This file was just a picture of a 5x5 red square
            //    inside of a gigantic 521x512 black square, and
            //    then I did a bunch of random, yellow zigzags.

    $file_to_grab_with_location = "test.bmp";

    $imagick_type = new Imagick();
           
        // Open File
        // ---------------------------------------------
                   
    $file_handle_for_viewing_image_file = fopen($file_to_grab_with_location, 'a+');
    $imagick_type->readImageFile($file_handle_for_viewing_image_file);
   
        // Preset Information
        // ---------------------------------------------

    $frequency_list_of_values = array();
   
        // Parse Pixels
        // ---------------------------------------------
       
    $image_resolution_width = $imagick_type->getImageWidth();
    $image_resolution_height = $imagick_type->getImageHeight();
       
    print("Image Resolution:  Width - $image_resolution_width / Height - $image_resolution_height<br><br>");
   
        // Parse Image Top-to-Bottom (Y-Variable)
        // ---------------------------------------------
   
    for($y = 0; $y < $image_resolution_height; $y++)
    {
            // Parse Image Left-to-Right (X-Variable)
            // ---------------------------------------------
       
        for($x = 0; $x < $image_resolution_width; $x++)
        {
       
                // Image Pixel Color
                // ---------------------------------------------
       
            $pixel_to_examine = $imagick_type->getImagePixelColor($x,$y);
           
            $pixel_to_examine_color_value_red = $pixel_to_examine->getColorValue(imagick::COLOR_RED);
            $pixel_to_examine_color_value_green = $pixel_to_examine->getColorValue(imagick::COLOR_GREEN);
            $pixel_to_examine_color_value_blue = $pixel_to_examine->getColorValue(imagick::COLOR_BLUE);

                // Set Key Value
                // ---------------------------------------------
       
            $key_value =    $pixel_to_examine_color_value_red    .    " / "    .
                    $pixel_to_examine_color_value_green    .    " / "    .
                    $pixel_to_examine_color_value_blue            ;
   
                // Increment Array Entry for Color
                // ---------------------------------------------
                   
            if(isset($frequency_list_of_values[$key_value]) == TRUE)
            {
                $temp = $frequency_list_of_values[$key_value];
                $temp++;
                $frequency_list_of_values[$key_value] = $temp;
            }
            else
            {
                $frequency_list_of_values[$key_value] = 1;
            }
        }
    }
               
        // Print Out Array of Values
        // ---------------------------------------------
   
    print("<pre>");
    print_r($frequency_list_of_values);
    print("</pre>");

/*

    Results:
    ------------------

Image Resolution: Width - 521 / Height - 512

Array
(
    [1 / 0 / 0] => 25
    [0 / 0 / 1] => 264107
    [1 / 1 / 0] => 2620
)

*/

?>

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