phpqrcode logo变成黑白是因为url获取的远端的图像是一个jpeg图像,也就是所谓truecolor的图像,而png是所谓的调色板图像,其解决办法就是将logo变成调色板图像。
用phpqrcode生成二维码并加上logo,为啥最后生成出来的LOGO变成黑白了?
代码如下:
include_once WEB_ROOT_PATH.'/classes/phpqrcode.php'; //set it to writable location, a place for temp generated PNG files $PNG_TEMP_DIR = WEB_ROOT_PATH.DIRECTORY_SEPARATOR.'userTgCache'.DIRECTORY_SEPARATOR; //html PNG location prefix $PNG_WEB_DIR = '/userTgCache/'; if (!file_exists($PNG_TEMP_DIR)) mkdir($PNG_TEMP_DIR); $filename = $PNG_TEMP_DIR.'test.png'; $errorCorrectionLevel = 'H'; $matrixPointSize = 10; QRcode::png("http://wwwww.xxxx.com/weixin/testXXXX", $filename, $errorCorrectionLevel, $matrixPointSize, 2); $QR = $filename; $logo = "http://wx.qlogo.cn/mmopen/LIUI5tJGiauCMgcRkLbYk7VfUaTdzcbTiaASdCMKj1rFicYTPyL0qibONtUuF9MQmpfRvABlPqJ2xsUbiaSL0q3t6iaF357Vg1PW7U/0"; if ($logo !== FALSE) { $QR = imagecreatefromstring(file_get_contents($QR)); $logo = imagecreatefromstring(file_get_contents($logo)); $QR_width = imagesx($QR);//二维码图片宽度 $QR_height = imagesy($QR);//二维码图片高度 $logo_width = imagesx($logo);//logo图片宽度 $logo_height = imagesy($logo);//logo图片高度 $logo_qr_width = $QR_width / 2.5; $scale = $logo_width/$logo_qr_width; $logo_qr_height = $logo_height/$scale; $from_width = ($QR_width - $logo_qr_width) / 2; //重新组合图片并调整大小 imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height); } //display generated file imagepng($QR, $filename); echo '<img src="'.$PNG_WEB_DIR.basename($filename).'"><hr>';
因为你用url获取的远端的图像是一个jpeg图像。也就是所谓truecolor的图像。而png是所谓的调色板图像,
需要先将 logo变成调色板图像,才能在copy时不丢失 颜色信息
代码如下:
$logo = imagecreatefromstring(file_get_contents($logo)); if (imageistruecolor($logo)) imagetruecolortopalette($logo, false, 65535); // 新加这个
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