Imagick::getImageColors

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 - 512Array(    [1 / 0 / 0] => 25    [0 / 0 / 1] => 264107    [1 / 1 / 0] => 2620)*/?>

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...Então eu fiz uma alteração 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 - 998Array(    [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.