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php 在png格式的图片上合成文字?

Jun 23, 2016 pm 02:25 PM

RT

需要在png格式的图片上合成一些文字,但是为什么会有黑色的背景?

原图是

但是我生成的图片是这样的

浏览器看的效果


我需要在原图下面的空白处合成一些字在居中位置,请高手帮帮忙!


回复讨论(解决方案)

你是可能从真彩背景(imagecreatetruecolor)中创建的画布
imagecreatetruecolor() 返回一个图像标识符,代表了一幅大小为 x_size 和 y_size 的黑色图像。

不妨贴下你的代码看看

图片使用了 png 特有的透明效果(photshop看到的是全透明效果)
在 GD 中拷贝一下就可以了

$url = 'http://img.bbs.csdn.net/upload/201310/29/1383042869_349074.png';$im1 = imagecreatefrompng($url);$im2 = imagecreatetruecolor(imagesx($im1), imagesy($im1));$bg = imagecolorallocate($im2, 255, 255, 255);imagefill($im2, 0, 0, $bg);imagecopy($im2, $im1, 0, 0, 0, 0, imagesx($im1), imagesy($im1));imagepng($im2);
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图片使用了 png 特有的透明效果(photshop看到的是全透明效果)
在 GD 中拷贝一下就可以了

$url = 'http://img.bbs.csdn.net/upload/201310/29/1383042869_349074.png';$im1 = imagecreatefrompng($url);$im2 = imagecreatetruecolor(imagesx($im1), imagesy($im1));$bg = imagecolorallocate($im2, 255, 255, 255);imagefill($im2, 0, 0, $bg);imagecopy($im2, $im1, 0, 0, 0, 0, imagesx($im1), imagesy($im1));imagepng($im2);
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但是我要的是这样的效果啊,就是不破坏原有的png图片的情况下,在图片的下面空白处,加一些文字啊。效果如下图

帮忙看看,该怎么实现呢?



人都哪去了,媒人愿意帮帮忙么?

百度都百了半天了

你是可能从真彩背景(imagecreatetruecolor)中创建的画布
imagecreatetruecolor() 返回一个图像标识符,代表了一幅大小为 x_size 和 y_size 的黑色图像。

不妨贴下你的代码看看

$file = '1.png';        #打开图片    $im = @imagecreatefrompng($file);    #设置水印字体颜色    $color = imagecolorallocatealpha($im,0,0,0);    #设置字体文件路径    $fontfile = "msyhbd.ttf";    #水印文字 	 $str = "我们都是好孩子";    #打水印    imagettftext($im,30,0,50,400,$color,$fontfile,$str);	imagettftext($im,20,0,50,450,$color,$fontfile,$str);	imagettftext($im,20,0,50,480,$color,$fontfile,$str);    header("Content-Type: image/png");    $newfile = imagepng($im);		//imagedestroy($im);   // imagejpeg($im,'water.jpg');
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请帮忙看看,谢谢!

y坐标400不都跑到图片外去了吗?

$url = 'http://img.bbs.csdn.net/upload/201310/29/1383042869_349074.png';$im1 = imagecreatefrompng($url);//这几行必须有,否则原图的阴影层过不来$im2 = imagecreatetruecolor(imagesx($im1), imagesy($im1));$bg = imagecolorallocate($im2, 255, 255, 255);imagefill($im2, 0, 0, $bg);imagecopy($im2, $im1, 0, 0, 0, 0, imagesx($im1), imagesy($im1));    #设置水印字体颜色    $color = imagecolorallocatealpha($im2,0,0,0,100);      #设置字体文件路径    $fontfile = "msyhbd.ttf";$fontfile = "c:/windows/fonts/FZJZJW.TTF";     #水印文字      $str = "我们都是好孩子";$str = iconv('gbk', 'utf-8', $str);    #打水印    imagettftext($im2,20,20,20,100,$color,$fontfile,$str);    imagettftext($im2,20,20,30,200,$color,$fontfile,$str);    imagettftext($im2,20,20,40,300,$color,$fontfile,$str);imagepng($im2);
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y坐标400不都跑到图片外去了吗?

$url = 'http://img.bbs.csdn.net/upload/201310/29/1383042869_349074.png';$im1 = imagecreatefrompng($url);//这几行必须有,否则原图的阴影层过不来$im2 = imagecreatetruecolor(imagesx($im1), imagesy($im1));$bg = imagecolorallocate($im2, 255, 255, 255);imagefill($im2, 0, 0, $bg);imagecopy($im2, $im1, 0, 0, 0, 0, imagesx($im1), imagesy($im1));    #设置水印字体颜色    $color = imagecolorallocatealpha($im2,0,0,0,100);      #设置字体文件路径    $fontfile = "msyhbd.ttf";$fontfile = "c:/windows/fonts/FZJZJW.TTF";     #水印文字      $str = "我们都是好孩子";$str = iconv('gbk', 'utf-8', $str);    #打水印    imagettftext($im2,20,20,20,100,$color,$fontfile,$str);    imagettftext($im2,20,20,30,200,$color,$fontfile,$str);    imagettftext($im2,20,20,40,300,$color,$fontfile,$str);imagepng($im2);
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貌似背景有边框了,不过还是谢谢了,我自己改了下,现在成功了,太感谢了!

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