php图像处理函数大全(缩放、剪裁、缩放、翻转、旋转、透明、锐化的实例总结)_PHP教程
Jul 20, 2016 am 11:12 AM
imagephp一函數創建剪裁影像處理圖片資源大全實例總結旋轉的縮放翻轉透明銳化
一、创建图片资源
imagecreatetruecolor(width,height);
imagecreatefromgif(图片名称);
imagecreatefrompng(图片名称);
imagecreatefromjpeg(图片名称);画出各种图像 imagegif(图片资源,保存路径);
imagepng()
imagejpeg();
二、获取图片属性
imagesx(res//宽度
imagesy(res//高度
getimagesize(文件路径)
返回一个具有四个单元的数组。索引 0 包含图像宽度的像素值，索引 1 包含图像高度的像素值。索引 2 是图像类型的标记：1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM。这些标记与 PHP 4.3.0 新加的 IMAGETYPE 常量对应。索引 3 是文本字符串，内容为“height="yyy" width="xxx"”，可直接用于 IMG 标记。
销毁图像资源
imagedestroy(图片资源);
三、透明处理
PNG、jpeg透明色都正常，只有gif不正常
imagecolortransparent(resource image [,int color])//将某个颜色设置成透明色
imagecolorstotal()
imagecolorforindex();
四、图片的裁剪
imagecopyresized()
imagecopyresampled();
五、加水印（文字、图片）
字符串编码转换string iconv ( string $in_charset , string $out_charset , string $str )
六、图片旋转
imagerotate();//制定角度的图片翻转
七、图片的翻转
沿X轴 沿Y轴翻转
八、锐化
imagecolorsforindex()
imagecolorat()
在图片上画图形 $img=imagecreatefromgif("./images/map.gif");
<span 1</span> <?<span PHP
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span * 图片锐化处理
</span><span 4</span> <span * edit by www.jbxue.com
</span><span 5</span> <span */</span>
<span 6</span> <span $red</span>= imagecolorallocate(<span $img</span>, 255, 0, 0<span );
</span><span 7</span>
<span 8</span> imageline(<span $img</span>, 0, 0, 100, 100, <span $red</span><span );
</span><span 9</span> imageellipse(<span $img</span>, 200, 100, 100, 100, <span $red</span><span );
</span><span 10</span> imagegif(<span $img</span>, "./images/map2.gif"<span );
</span><span 11</span> imagedestroy(<span $img</span><span );
</span><span 12</span> <span 图片普通缩放
</span><span 13</span> 复制代码 代码如下:
<span 14</span>
<span 15</span> <span $filename</span>="./images/hee.jpg"<span ;
</span><span 16</span> <span $per</span>=0.3<span ;
</span><span 17</span> <span list</span>(<span $width</span>, <span $height</span>)=<span getimagesize</span>(<span $filename</span><span );
</span><span 18</span> <span $n_w</span>=<span $width</span>*<span $per</span><span ;
</span><span 19</span> <span $n_h</span>=<span $width</span>*<span $per</span><span ;
</span><span 20</span> <span $new</span>=imagecreatetruecolor(<span $n_w</span>, <span $n_h</span><span );
</span><span 21</span> <span $img</span>=imagecreatefromjpeg(<span $filename</span><span );
</span><span 22</span> <span //</span><span 拷贝部分图像并调整</span>
<span 23</span> imagecopyresized(<span $new</span>, <span $img</span>,0, 0,0, 0,<span $n_w</span>, <span $n_h</span>, <span $width</span>, <span $height</span><span );
</span><span 24</span> <span //</span><span 图像输出新图片、另存为</span>
<span 25</span> imagejpeg(<span $new</span>, "./images/hee2.jpg"<span );
</span><span 26</span> imagedestroy(<span $new</span><span );
</span><span 27</span> imagedestroy(<span $img</span><span );
</span><span 28</span>
<span 29</span> <span 图片等比例缩放、没处理透明色
</span><span 30</span> 复制代码 代码如下:
<span 31</span>
<span 32</span> <span function</span> thumn(<span $background</span>, <span $width</span>, <span $height</span>, <span $newfile</span><span ) {
</span><span 33</span> <span list</span>(<span $s_w</span>, <span $s_h</span>)=<span getimagesize</span>(<span $background</span>);<span //</span><span 获取原图片高度、宽度</span>
<span 34</span> <span if</span> (<span $width</span> && (<span $s_w</span> < <span $s_h</span><span )) {
</span><span 35</span> <span $width</span> = (<span $height</span> / <span $s_h</span>) * <span $s_w</span><span ;
</span><span 36</span> } <span else</span><span {
</span><span 37</span> <span $height</span> = (<span $width</span> / <span $s_w</span>) * <span $s_h</span><span ;
</span><span 38</span> <span }
</span><span 39</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 40</span> <span $img</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 41</span> imagecopyresampled(<span $new</span>, <span $img</span>, 0, 0, 0, 0, <span $width</span>, <span $height</span>, <span $s_w</span>, <span $s_h</span><span );
</span><span 42</span> imagejpeg(<span $new</span>, <span $newfile</span><span );
</span><span 43</span> imagedestroy(<span $new</span><span );
</span><span 44</span> imagedestroy(<span $img</span><span );
</span><span 45</span> <span }
</span><span 46</span> thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg"<span );
</span><span 47</span>
<span 48</span> <span gif透明色处理
</span><span 49</span> 复制代码 代码如下:
<span 50</span>
<span 51</span> <span function</span> thumn(<span $background</span>, <span $width</span>, <span $height</span>, <span $newfile</span><span ) {
</span><span 52</span> <span list</span>(<span $s_w</span>, <span $s_h</span>)=<span getimagesize</span>(<span $background</span><span );
</span><span 53</span> <span if</span> (<span $width</span> && (<span $s_w</span> < <span $s_h</span><span )) {
</span><span 54</span> <span $width</span> = (<span $height</span> / <span $s_h</span>) * <span $s_w</span><span ;
</span><span 55</span> } <span else</span><span {
</span><span 56</span> <span $height</span> = (<span $width</span> / <span $s_w</span>) * <span $s_h</span><span ;
</span><span 57</span> <span }
</span><span 58</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 59</span> <span $img</span>=imagecreatefromgif(<span $background</span><span );
</span><span 60</span> <span $otsc</span>=imagecolortransparent(<span $img</span><span );
</span><span 61</span> <span if</span>(<span $otsc</span> >=0 && <span $otst</span> < imagecolorstotal(<span $img</span>)){<span //</span><span 判断索引色</span>
<span 62</span> <span $tran</span>=imagecolorsforindex(<span $img</span>, <span $otsc</span>);<span //</span><span 索引颜色值</span>
<span 63</span> <span $newt</span>=imagecolorallocate(<span $new</span>, <span $tran</span>["red"], <span $tran</span>["green"], <span $tran</span>["blue"<span ]);
</span><span 64</span> imagefill(<span $new</span>, 0, 0, <span $newt</span><span );
</span><span 65</span> imagecolortransparent(<span $new</span>, <span $newt</span><span );
</span><span 66</span> <span }
</span><span 67</span> imagecopyresized(<span $new</span>, <span $img</span>, 0, 0, 0, 0, <span $width</span>, <span $height</span>, <span $s_w</span>, <span $s_h</span><span );
</span><span 68</span> imagegif(<span $new</span>, <span $newfile</span><span );
</span><span 69</span> imagedestroy(<span $new</span><span );
</span><span 70</span> imagedestroy(<span $img</span><span );
</span><span 71</span> <span }
</span><span 72</span> thumn("images/map.gif", 200, 200, "./images/map3.gif");
<?<span php
</span><span /*</span><span *
* 图片裁剪处理
* edit by www.jbxue.com
</span><span */</span>
<span function</span> cut(<span $background</span>, <span $cut_x</span>, <span $cut_y</span>, <span $cut_width</span>, <span $cut_height</span>, <span $location</span><span ){
</span><span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span $new</span>=imagecreatetruecolor(<span $cut_width</span>, <span $cut_height</span><span );
imagecopyresampled(</span><span $new</span>, <span $back</span>, 0, 0, <span $cut_x</span>, <span $cut_y</span>, <span $cut_width</span>, <span $cut_height</span>,<span $cut_width</span>,<span $cut_height</span><span );
imagejpeg(</span><span $new</span>, <span $location</span><span );
imagedestroy(</span><span $new</span><span );
imagedestroy(</span><span $back</span><span );
}
cut(</span>"./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg"<span );
</span>?>
文字水印
<span 1</span> <?<span PHP
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span *
</span><span 4</span> <span * 图片添加文字水印
</span><span 5</span> <span */</span>
<span 6</span>
<span 7</span> <span function</span> mark_text(<span $background</span>, <span $text</span>, <span $x</span>, <span $y</span><span ){
</span><span 8</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 9</span> <span $color</span>=imagecolorallocate(<span $back</span>, 0, 255, 0<span );
</span><span 10</span> imagettftext(<span $back</span>, 20, 0, <span $x</span>, <span $y</span>, <span $color</span>, "simkai.ttf", <span $text</span><span );
</span><span 11</span> imagejpeg(<span $back</span>, "./images/hee7.jpg"<span );
</span><span 12</span> imagedestroy(<span $back</span><span );
</span><span 13</span> <span }
</span><span 14</span> mark_text("./images/hee.jpg", "细说PHP", 150, 250<span );
</span><span 15</span> <span //</span><span 图片水印</span>
<span 16</span> <span function</span> mark_pic(<span $background</span>, <span $waterpic</span>, <span $x</span>, <span $y</span><span ){
</span><span 17</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 18</span> <span $water</span>=imagecreatefromgif(<span $waterpic</span><span );
</span><span 19</span> <span $w_w</span>=imagesx(<span $water</span><span );
</span><span 20</span> <span $w_h</span>=imagesy(<span $water</span><span );
</span><span 21</span> imagecopy(<span $back</span>, <span $water</span>, <span $x</span>, <span $y</span>, 0, 0, <span $w_w</span>, <span $w_h</span><span );
</span><span 22</span> imagejpeg(<span $back</span>,"./images/hee8.jpg"<span );
</span><span 23</span> imagedestroy(<span $back</span><span );
</span><span 24</span> imagedestroy(<span $water</span><span );
</span><span 25</span> <span }
</span><span 26</span> mark_pic("./images/hee.jpg", "./images/gaolf.gif", 50, 200);
图片旋转
<span 1</span> <?<span PHP
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span * 图片旋转
</span><span 4</span> <span * edit by www.jbxue.com
</span><span 5</span> <span */</span>
<span 6</span> <span $back</span>=imagecreatefromjpeg("./images/hee.jpg"<span );
</span><span 7</span>
<span 8</span> <span $new</span>=imagerotate(<span $back</span>, 45, 0<span );
</span><span 9</span> imagejpeg(<span $new</span>, "./images/hee9.jpg"<span );
</span><span 10</span> ?>
<span 1</span> <?<span php
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span * 图片水平翻转 垂直翻转
</span><span 4</span> <span * edit by www.jbxue.com
</span><span 5</span> <span */</span>
<span 6</span> <span function</span> turn_y(<span $background</span>, <span $newfile</span><span ){
</span><span 7</span>
<span 8</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 9</span> <span $width</span>=imagesx(<span $back</span><span );
</span><span 10</span> <span $height</span>=imagesy(<span $back</span><span );
</span><span 11</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 12</span> <span for</span>(<span $x</span>=0; <span $x</span> < <span $width</span>; <span $x</span>++<span ){
</span><span 13</span> imagecopy(<span $new</span>, <span $back</span>, <span $width</span>-<span $x</span>-1, 0, <span $x</span>, 0, 1, <span $height</span><span );
</span><span 14</span> <span }
</span><span 15</span> imagejpeg(<span $new</span>, <span $newfile</span><span );
</span><span 16</span> imagedestroy(<span $back</span><span );
</span><span 17</span> imagedestroy(<span $new</span><span );
</span><span 18</span> <span }
</span><span 19</span> <span function</span> turn_x(<span $background</span>, <span $newfile</span><span ){
</span><span 20</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 21</span> <span $width</span>=imagesx(<span $back</span><span );
</span><span 22</span> <span $height</span>=imagesy(<span $back</span><span );
</span><span 23</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 24</span> <span for</span>(<span $y</span>=0; <span $y</span> < <span $height</span>; <span $y</span>++<span ){
</span><span 25</span> imagecopy(<span $new</span>, <span $back</span>,0, <span $height</span>-<span $y</span>-1, 0, <span $y</span>, <span $width</span>, 1<span );
</span><span 26</span> <span }
</span><span 27</span> imagejpeg(<span $new</span>, <span $newfile</span><span );
</span><span 28</span> imagedestroy(<span $back</span><span );
</span><span 29</span> imagedestroy(<span $new</span><span );
</span><span 30</span> <span }
</span><span 31</span> turn_y("./images/hee.jpg", "./images/hee11.jpg"<span );
</span><span 32</span> turn_x("./images/hee.jpg", "./images/hee12.jpg"<span );
</span><span 33</span> ?>
陳述
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