PHP修改图片
这篇是关于修改图片的效果,主要还是用到php中的GD库中的函数,没想到php还有这凶残能力,出乎我的预料。 先看代码upload_image.php,主要是一个上传控件,用来选择图片 html head title / title style type ="text/css" / style / head body form action ="
这篇是关于修改图片的效果,主要还是用到php中的GD库中的函数,没想到php还有这凶残能力,出乎我的预料。
先看代码upload_image.php,主要是一个上传控件,用来选择图片
html>
head>
title>title>
style type="text/css">style>
head>
body>
form action="check_image.php" method="post" enctype="multipart/form-data">
table>
tr>
td>Your usernametd>
td>input type="text" name="username" />td>
tr>
tr>
td>Upload image*td>
td>input type="file" name="uploadfile"/>td>
tr>
tr>
td colspan="2">
small>em> * Acceptable image formats include: GIF, JPG/JPEG and PNG.em>small>
td>
tr>
tr>
td>Image Captiontd>
td>input type="text" name="caption"/>td>
tr>
tr>
td colspan="2" style="text-align:center;">
input type="submit" name="submit" value="Upload" />
td>
tr>
table>
form>
body>
html>
然后是上传和处理图片的逻辑check_image.php
php //修改图片效果 $db = mysql_connect('localhost','root','Ctrip07185419') or die('can not connect to database'); mysql_select_db('moviesite',$db) or die(mysql_error($db)); //上传文件的路径 $dir = 'D:\Serious\phpdev\test\images'; //upload_image.php页面传递过来的参数,如果是上传图片 if($_POST['submit'] == 'Upload') { if($_FILES['uploadfile']['error'] != UPLOAD_ERR_OK) { switch($_FILES['uploadfiel']['error']) { case UPLOAD_ERR_INI_SIZE: die('The uploaded file exceeds the upload_max_filesize directive'); break; case UPLOAD_ERR_FORM_SIZE: die('The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form'); break; case UPLOAD_ERR_PARTIAL: die('The uploaded file was only partially uploaded'); break; case UPLOAD_ERR_NO_FILE: die('No file was uploaded'); break; case UPLOAD_ERR_NO_TMP_DIR: die('The server is missing a temporary folder'); break; case UPLOAD_ERR_CANT_WRITE: die('The server fail to write the uploaded file to the disk'); break; case UPLOAD_ERR_EXTENSION: die('The upload stopped by extension'); break; } } $image_caption = $_POST['caption']; $image_username = $_POST['username']; $image_date = date('Y-m-d'); list($width,$height,$type,$attr) = getimagesize($_FILES['uploadfile']['tmp_name']); $error = 'The file you upload is not a supported filetype'; switch($type) { case IMAGETYPE_GIF: $image = imagecreatefromgif($_FILES['uploadfile']['tmp_name']) or die($error); break; case IMAGETYPE_JPEG: $image = imagecreatefromjpeg($_FILES['uploadfile']['tmp_name']) or die($error); break; case IMAGETYPE_PNG: $image = imagecreatefrompng($_FILES['uploadfile']['tmp_name']) or die($error); break; default: break; } $query = 'insert into images(image_caption,image_username,image_date) values("'.$image_caption.'" , "'.$image_username.'","'.$image_date.'")'; $result = mysql_query($query,$db) or die(mysql_error($db)); $last_id = mysql_insert_id(); // $imagename = $last_id.'.jpg'; // imagejpeg($image,$dir.'/'.$imagename); // imagedestroy($image); $image_id = $last_id; imagejpeg($image , $dir.'/'.$image_id.'.jpg'); imagedestroy($image); } else //如果图片已经上传,则从数据库中取图片名字 { $query = 'select image_id,image_caption,image_username,image_date from images where image_id='.$_POST['id']; $result = mysql_query($query,$db) or die(mysql_error($db)); extract(mysql_fetch_assoc($result)); list($width,$height,$type,$attr) = getimagesize($dir.'/'.$image_id.'.jpg'); } //如果是保存图片 if($_POST['submit'] == 'Save') { if(isset($_POST['id']) && ctype_digit($_POST['id']) && file_exists($dir.'/'.$_POST['id'].'.jpg')) { $image = imagecreatefromjpeg($dir.'/'.$_POST['id'].'.jpg'); } else { die('invalid image specified'); } $effect = (isset($_POST['effect'])) ? $_POST['effect'] : -1; switch($effect) { case IMG_FILTER_NEGATE: imagefilter($image , IMG_FILTER_NEGATE); //将图像中所有颜色反转 break; case IMG_FILTER_GRAYSCALE: imagefilter($image , IMG_FILTER_GRAYSCALE); //将图像转换为灰度的 break; case IMG_FILTER_EMBOSS: imagefilter($image , IMG_FILTER_EMBOSS); //使图像浮雕化 break; case IMG_FILTER_GAUSSIAN_BLUR: imagefilter($image , IMG_FILTER_GAUSSIAN_BLUR); //用高斯算法模糊图像 break; } imagejpeg($image , $dir.'/'.$_POST['id'].'.jpg' , 100); ?>Here is your pic! Your image has been saved!
php } else { ?>Here is your pic! So how does it feel to be famous?
Here is the picture you just uploaded to your servers:
php if($_POST['submit'] == 'Upload') { $imagename = 'images/'.$image_id.'.jpg'; } else { $imagename = 'image_effect.php?id='.$image_id.'&e='.$_POST['effect']; } ?>
Image save as: | $image_id?> |
Height: | echo $height;?> |
Widht: | echo $width;?> |
Upload date: | echo $image_date;?> |
You may apply a special effect to your image from the list of option below. Note:saving an image with any of the filters applied can be undone
php } ?>最后是一个预览效果的页面image_effect.php
php $dir = 'D:\Serious\phpdev\test\images'; if(isset($_GET['id']) && ctype_digit($_GET['id']) && file_exists($dir.'/'.$_GET['id'].'.jpg')) { $image = imagecreatefromjpeg($dir.'/'.$_GET['id'].'.jpg'); } else { die('invalid image specified'); } $effect = (isset($_GET['e'])) ? $_GET['e'] : -1; switch($effect) { case IMG_FILTER_NEGATE: imagefilter($image , IMG_FILTER_NEGATE); break; case IMG_FILTER_GRAYSCALE: imagefilter($image , IMG_FILTER_GRAYSCALE); break; case IMG_FILTER_EMBOSS: imagefilter($image , IMG_FILTER_EMBOSS); break; case IMG_FILTER_GAUSSIAN_BLUR: imagefilter($image , IMG_FILTER_GAUSSIAN_BLUR); break; } header('Content-Type:image/jpeg'); imagejpeg($image , '' , 100); ?>
第二个image_check.php有点乱,在这个页面中有上传图片,处理图片,还有预览图片的部分逻辑,注意下面这段
php if($_POST['submit'] == 'Upload') { $imagename = 'images/'.$image_id.'.jpg'; } else { $imagename = 'image_effect.php?id='.$image_id.'&e='.$_POST['effect']; } ?>
如果是上传直接访问图片,如果是预览则从image_effect.php中读取图片,这里是从内存中读取图片并根据选择的处理效果来展示图片。如下
switch($effect) { case IMG_FILTER_NEGATE: imagefilter($image , IMG_FILTER_NEGATE); break; case IMG_FILTER_GRAYSCALE: imagefilter($image , IMG_FILTER_GRAYSCALE); break; case IMG_FILTER_EMBOSS: imagefilter($image , IMG_FILTER_EMBOSS); break; case IMG_FILTER_GAUSSIAN_BLUR: imagefilter($image , IMG_FILTER_GAUSSIAN_BLUR); break; }
当使用imagefilter方法处理图片之后会把图片输出到页面,这里要注意imagejpeg方法的第二个参数是空字符串,这样它就不会写入到硬盘中了,如果第二个参数设置了会覆盖原有的图片,这样可以让用户在保存图片之前随意的预览效果,如下:
header('Content-Type:image/jpeg'); imagejpeg($image , '' , 100);
在check_image.php中有调用到类似的方法,但是这里指定了第二个参数,就是用来保存图片的:
imagejpeg($image , $dir.'/'.$_POST['id'].'.jpg' , 100);
注意这里哦我们只写了三种处理效果,这个只是所有枚举中的一部分,我们来看所有的处理方式:
IMG_FILTER_NEGATE:将图像中所有颜色反转。
IMG_FILTER_GRAYSCALE:将图像转换为灰度的。
IMG_FILTER_BRIGHTNESS:改变图像的亮度。用 arg1 设定亮度级别。
IMG_FILTER_CONTRAST:改变图像的对比度。用 arg1 设定对比度级别。
IMG_FILTER_COLORIZE:与 IMG_FILTER_GRAYSCALE 类似,不过可以指定颜色。用 arg1,arg2 和 arg3 分别指定 red,blue 和 green。每种颜色范围是 0 到 255。
IMG_FILTER_EDGEDETECT:用边缘检测来突出图像的边缘。
IMG_FILTER_EMBOSS:使图像浮雕化。
IMG_FILTER_GAUSSIAN_BLUR:用高斯算法模糊图像。
IMG_FILTER_SELECTIVE_BLUR:模糊图像。
IMG_FILTER_MEAN_REMOVAL:用平均移除法来达到轮廓效果。
IMG_FILTER_SMOOTH:使图像更柔滑。用 arg1 设定柔滑级别。
是不是很惊艳,php很强大的。
上一篇: SSDB Redis替代品