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PHP截取图片指定的某个区域

Jun 06, 2016 pm 08:10 PM
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PHP缩小/放大图片的代码有很多,但是似乎截图没什么范例可以参考,其实还蛮简单的,跟缩小图片差不多,只是参数上有些不同而已。先举个例子,如书摘:“狡兔总比慢龟好”这篇文章中的那张图片(请自行到此文章去看),我如果只想把"狡兔三窟"的那个黄色区块截

PHP缩小/放大图片的代码有很多,但是似乎截图没什么范例可以参考,其实还蛮简单的,跟缩小图片差不多,只是参数上有些不同而已。 先举个例子,如 书摘: “狡兔总比慢龟好”这篇文章中的那张图片(请自行到此文章去看),我如果只想把 "狡兔三窟" 的那个黄色区块截取出来,下述的范例,只要把图下来,直接执行就会看到那个区块的图了。 档案内大概该有的注解都写好了(Source code 放在此篇最下面),解释一下主要参数即可: imagecopyresampled($newim, $im, 0, 0, 7, 174, 120, 42, $new_img_width, $new_img_height); // 原始尺寸 120 x 42  imagecopyresampled($newim, $im, 0, 0, 100, 30, 500, 500, $new_img_width, $new_img_height); // 图截出来后放到 500 x 500  imagecopyresampled($newim, $im, 0, 0, 100, 30, 10, 10, $new_img_width, $new_img_height); // 图截出来后缩小到 10 x 10  大概主要是这个 function 的操作而已,主要只看第一个原尺寸的那个参数对照就好了,下述是 imagecopyresampled 的参数,一个一个对照如下: $newim: imagecreate($new_img_width, $new_img_height); 建立的空白图层  $im: imagecreatefromjpeg($filename); 把原本的图片读进来  0: 输出图要从哪边开始的 x 点(图片输出的点是可以指定的,没指定到的位置就会是你 create 的图层颜色或图) 0: 输出图要从哪边开始的 y 点(同上) 7: 原始图要从哪边开始 x (指定要从哪个 x 点开始截取) 174: 原始图要从哪边开始 y (指定要从哪个点开始截取,截取区块大小由下面两个参数去定) 120: 截图要截多大 width ,从上面的指定的位置,开始截取 120px 宽(如果要放大缩小也是由此处决定) 42: 截图要截多大 height ,从上面的指定的位置,开始截取 42px 高(如果要放大缩小也是由此处决定) $new_img_width: 这是新的图,从上面写的第二组参数 0, 0 ,要开始画多宽(在此程式目前是指定截图的大小) $new_img_height: 这是新的图,从上面的第二组参数 0, 0 ,要开始画多高(在此程式目前是指定截图的大小) 完整的代码如下:   Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * PHP 截图程式 * * @author: tsung http://plog.longwin.com.tw * @desc: http://plog.longwin.com.tw/programming/2007/11/09/php_snap_image_block_2007 * */ header("Content-type: image/jpeg");  $filename = 'book_rabbit_rule.jpg'; /* 读取图档 */ $im = imagecreatefromjpeg($filename);  /* 图片要截多少, 长/宽 */ $new_img_width = 120; $new_img_height = 42;  /* 先建立一个 新的空白图档 */ $newim = imagecreate($new_img_width, $new_img_height);  // 输出图要从哪边开始 x, y ,原始图要从哪边开始 x, y ,要画多大 x, y(resize) , 要抓多大 x, y imagecopyresampled($newim, $im, 0, 0, 7, 174, 120, 42, $new_img_width, $new_img_height);  /* 放大成 500 x 500 的图 */ // imagecopyresampled($newim, $im, 0, 0, 100, 30, 500, 500, $new_img_width, $new_img_height);  /* 将图印出来 */ imagejpeg($newim);  /* 资源回收 */ imagedestroy($newim); imagedestroy($im); ?>
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