自动获取图片主题颜色，应用场景是商品上传的时候，默认的背景色等 ```php $pictureColor = new pictureColor(); $picUrls = array('./1.png','./2.png','./4.png','./3.jpg'); foreach ($picUrls as $key=>$url){ //获取色值 $color=$pictureColor->hexName($url); //获取颜色名称 $colorName=$pictureColor->colorName($url); echo "<img style='width:100px;float: left;' src='$url'>"; echo "<div style='width: 100px;height: 100px;float: left;'>$colorName</div>"; } class pictureColor { /** * 获取颜色使用库类型 */ public $type = 'gd'; /** * 十六进制 */ public $hex = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'); /** * 获得图片色系 * * @param string $file * @return string */ public function colorName($file) { if (empty($file)) { return false; } $rgb = $this->getRGB($file); $hsl = $this->RGB2HSL($rgb); return $this->getColorName($hsl); } /** * 取得图片十六进制 * * @param string $file * @return string */ public function hexName($file) { try { if (empty($file)) { return false; } $rgb = $this->getRGB($file, $this->type); $color = $this->RGB2Hex($rgb); if (strlen($color) > 6) $color = substr($color, 1, 6); return $color; } catch (Exception $e) { echo $e; } } /** * 取得图片RGB * * @param string $file * @param string $type gd/gm * @return array */ public function getRGB($file) { if (empty($file)) { return false; } $imageSize = getimagesize($file); if ($imageSize['mime'] == 'image/jpeg') { $img = imagecreatefromjpeg($file); } elseif ($imageSize['mime'] == 'image/png') { $img = imagecreatefrompng($file); } elseif ($imageSize['mime'] == 'image/gif') { $img = imagecreatefromgif($file); } $w = imagesx($img); $h = imagesy($img); $r = $g = $b = 0; for ($y = 0; $y < $h; $y++) { for ($x = 0; $x < $w; $x++) { $rgb = imagecolorat($img, $x, $y); $r += $rgb >> 16; $g += $rgb >> 8 & 255; $b += $rgb & 255; } } $pxls = $w * $h; $r = (round($r / $pxls)); $g = (round($g / $pxls)); $b = (round($b / $pxls)); return array('0' => $r, '1' => $g, '2' => $b); } public function RGB2Hex($rgb) { $hexColor = ''; $hex = $this->hex; for ($i = 0; $i < 3; $i++) { $r = null; $c = $rgb [$i]; $hexAr = array(); while ($c > 16) { $r = $c % 16; $c = ($c / 16) >> 0; array_push($hexAr, $hex [$r]); } array_push($hexAr, $hex [$c]); $ret = array_reverse($hexAr); $item = implode('', $ret); $item = str_pad($item, 2, '0', STR_PAD_LEFT); $hexColor .= $item; } return $hexColor; } /** * RGB转HSL * * @param array $rgb * @return array */ public function RGB2HSL($rgb) { list($r, $g, $b) = $rgb; $r /= 255; $g /= 255; $b /= 255; $max = max($r, $g, $b); $min = min($r, $g, $b); $delta = $max - $min; $l = ($max + $min) / 2; if ($delta == 0) { $h = 0; $s = 0; } else { $s = ($l < 0.5) ? $delta / ($max + $min) : $delta / (2 - $max - $min); $deltar = ((($max - $r) / 6) + ($max / 2)) / $delta; $deltag = ((($max - $g) / 6) + ($max / 2)) / $delta; $deltab = ((($max - $b) / 6) + ($max / 2)) / $delta; if ($r == $max) { $h = $deltab - $deltag; } else if ($g == $max) { $h = (1 / 3) + $deltar - $deltab; } else if ($b == $max) { $h = (2 / 3) + $deltag - $deltar; } $h += ($h < 0) ? 1 : ($h > 1 ? -1 : 0); } return array($h * 360, $s * 100, $l * 100); } /** * HSL对应颜色名称 * * @param array $hsl * @return string */ public function getColorName($hsl) { $colorarr = array( '0, 100, 50' => '红色', '30, 100, 50' => '橙色', '60, 100, 50' => '黄色', '120, 100, 75' => '绿色', '240, 100, 25' => '蓝色', '300, 100, 25' => '紫色', '255, 152, 191' => '粉红', //'136, 84, 24' => '棕色', '0, 0, 50' => '灰色', '0, 0, 0' => '黑色', '0, 0, 100' => '白色', ); $distarr = array(); foreach ($colorarr as $key => $val) { list($h, $s, $l) = explode(',', $key); $distarr[$key] = pow(($hsl['0'] - $h), 2) + pow(($hsl['1'] - $s), 2) + pow(($hsl['2'] - $l), 2); } asort($distarr); list($key) = each($distarr); return $colorarr[$key]; } } ```