README

像人类一样从图片中提取颜色。

安装

通过 Composer

$ composer require myindexlike/best-color-extractor:0.3.*

使用方法

require 'vendor/autoload.php';

use RuslanPro\ColorExtractor\Color;
use RuslanPro\ColorExtractor\ColorExtractor;
use RuslanPro\ColorExtractor\Palette;

$palette = Palette::fromFilename('./some/image.png');

// $palette is an iterator on colors sorted by pixel count
foreach($palette as $color => $count) {
    // colors are represented by integers
    echo Color::fromIntToHex($color), ': ', $count, "\n";
}

// it offers some helpers too
$topFive = $palette->getMostUsedColors(5);

$colorCount = count($palette);

$blackCount = $palette->getColorCount(Color::fromHexToInt('#000000'));


// an extractor is built from a palette
$extractor = new ColorExtractor($palette);

// it defines an extract method which return the most “representative” colors
$colors = $extractor->extract(5);

处理透明度

默认情况下 任何具有大于零的alpha值的像素将被丢弃。这是因为透明颜色不会被正常感知。例如，在白色背景上，完全透明的黑色会被看作是白色。所以，如果您想在构建调色板时考虑透明度，您必须指定此背景颜色。您可以通过Palette构造函数的第二个参数来做到这一点。它的默认值是null，这意味着如果颜色的alpha分量存在且大于零，则颜色不会被添加到调色板中。

您可以将它设置为表示颜色的整数，然后透明颜色将在添加到调色板之前进行混合。

// we set a white background so fully transparent colors will be added as white in the palette
// pure red #FF0000 at 50% opacity will be stored as #FF8080 as it would be perceived
$palette = Palette::fromFilename('./some/image.png', Color::fromHexToInt('#FFFFFF'));

myindexlike / color-extractor

维护者

详细信息

README

安装

使用方法

处理透明度