阿里云对象存储 OSS ＞数据处理＞图片处理指南＞图片缩放

绝地灬酷狼 2021-10-14 07:26 492阅读 0赞

# 图片缩放 #

更新时间：2019-06-27 10:12:31

[编辑][Link 1][我的收藏][Link 2]

本页目录

*  [图片缩放参数][Link 3]
 *  [图片缩放注意事项][Link 4]
 *  [图片缩放示例][Link 5]
 *  [SDK 示例][SDK]

阿里云OSS的图片处理功能支持处理上传至OSS的图片文件，本文主要介绍如何进行图片缩放。

**说明** 图片处理支持的格式：jpg、png、bmp、gif、webp、tiff。

## 图片缩放参数 ##

操作名称：`resize`

*  指定宽高缩放
    
    <table>  &nbsp;  
     <thead> 
      <tr> 
       <th>名称</th> 
       <th>描述</th> 
       <th>取值范围</th> 
      </tr> 
     </thead> 
     <tbody> 
      <tr> 
       <td>m</td> 
       <td>指定缩略的模式： 
        <ul> 
         <li>lfit：等比缩放，限制在指定w与h的矩形内的最大图片。</li> 
         <li>mfit：等比缩放，延伸出指定w与h的矩形框外的最小图片。</li> 
         <li>fill：固定宽高，将延伸出指定w与h的矩形框外的最小图片进行居中裁剪。</li> 
         <li>pad：固定宽高，缩略填充。</li> 
         <li>fixed：固定宽高，强制缩略。</li> 
        </ul></td> 
       <td>lfit、mfit、fill、pad、fixed，默认为&nbsp;lfit。</td> 
      </tr> 
      <tr> 
       <td>w</td> 
       <td>指定目标缩略图的宽度。</td> 
       <td>1-4096</td> 
      </tr> 
      <tr> 
       <td>h</td> 
       <td>指定目标缩略图的高度。</td> 
       <td>1-4096</td> 
      </tr> 
      <tr> 
       <td>l</td> 
       <td>指定目标缩略图的最长边。</td> 
       <td>1-4096</td> 
      </tr> 
      <tr> 
       <td>s</td> 
       <td>指定目标缩略图的最短边。</td> 
       <td>1-4096</td> 
      </tr> 
      <tr> 
       <td>limit</td> 
       <td>指定当目标缩略图大于原图时是否处理。值是 1 表示不处理；值是 0 表示处理。</td> 
       <td>0/1, 默认是 1</td> 
      </tr> 
      <tr> 
       <td>color</td> 
       <td>当缩放模式选择为 pad（缩略填充）时，可以选择填充的颜色(默认是白色)参数的填写方式：采用 16 进制颜色码表示，如 00FF00（绿色）。</td> 
       <td>[000000-FFFFFF]</td> 
      </tr> 
     </tbody> 
    </table>
 *  按比例缩放
    
    <table>  &nbsp;  
     <thead> 
      <tr> 
       <th>名称</th> 
       <th>描述</th> 
       <th>取值范围</th> 
      </tr> 
     </thead> 
     <tbody> 
      <tr> 
       <td>p</td> 
       <td>倍数百分比。 小于 100，即是缩小，大于 100 即是放大。</td> 
       <td>1-1000</td> 
      </tr> 
     </tbody> 
    </table>

## 图片缩放注意事项 ##

*  对于原图：
    
     *  图片格式只能是：jpg、png、bmp、gif、webp、tiff。
     *  文件大小不能超过 20MB。
     *  使用图片旋转时图片的宽或者高不能超过 4096。
     *  原图单边大小不能超过30,000。
 *  对于缩略图：对缩略后的图片大小有限制，目标缩略图宽与高的乘积不能超过 4096x4096，且单边长度不能超过 4096。
 *  关于长短边：“长边”是指原尺寸与目标尺寸的比值大的那条边，“短边”同理。例如，原图400x200，缩放为 800x100，由于 400/800=0.5，200/100=2，0.5 < 2，所以在这个缩放中 200 那条是长边，400 那条是短边。
 *  当只指定宽度或者高度时，在等比缩放的情况下，都会默认进行单边的缩放。在固定宽高的模式下，会默认宽高一样的情况下进行缩略。
 *  如果只指定宽度或者高度，原图按原图格式返回。如果想保存成其他格式，详细可以查看[质量变换][Link 6]及[格式转换][Link 7]。
 *  调用 resize，默认是不允许放大。即如果请求的图片比原图大，那么返回的仍然是原图。如果想取到放大的图片，即增加参数调用 `limit_0` （如：`https://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,w_500,limit_0`）

## 图片缩放示例 ##

*  单边缩略
    
     *  按宽高：将图缩略成高度为 100，宽度按比例处理。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,h\_100][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_h_100]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NDkyNDE0X3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NDkyNDE0X3poLUNOLmpwZw 1]
     *  按长边短边：将图最长边限制在 100 像素，短边按比例处理。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,l\_100][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_l_100]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE1X3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE1X3poLUNOLmpwZw 1]
 *  强制宽高缩略：将图强制缩略成宽度为 100，高度为 100。
    
    [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m\_fixed,h\_100,w\_100][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_fixed_h_100_w_100]
    
      
    [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE2X3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE2X3poLUNOLmpwZw 1]
 *  等比缩放，限定在矩形框内
    
     *  将图缩略成宽度为 100，高度为 100，按长边优先。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m\_lfit,h\_100,w\_100][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_lfit_h_100_w_100]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE4X3poLUNOLnBuZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE4X3poLUNOLnBuZw 1]
     *  将图缩略成宽度为 100，高度为 100，按长边优先，将图片保存成 png 格式。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m\_lfit,h\_100,w\_100/format,png][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_lfit_h_100_w_100_format_png]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE5X3poLUNOLnBuZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDE5X3poLUNOLnBuZw 1]
 *  等比缩放，限定在矩形框外
    
     *  将图缩略成宽度为 100，高度为 100，按短边优先。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m\_mfit,h\_100,w\_100][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_mfit_h_100_w_100]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDIwX3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDIwX3poLUNOLmpwZw 1]
 *  固定宽高，自动裁剪
    
     *  将图自动裁剪成宽度为 100，高度为 100 的效果图。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m\_fill,h\_100,w\_100][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_fill_h_100_w_100]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDIxX3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDIxX3poLUNOLmpwZw 1]
 *  固定宽高，缩略填充
    
     *  将原图指定按短边缩略 100x100，剩余的部分以白色填充。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m\_pad,h\_100,w\_100][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_pad_h_100_w_100]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDIyX3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTAyNDIyX3poLUNOLmpwZw 1]
     *  将图按短边缩略到 100x100，然后按红色填充。
        
        [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m\_pad,h\_100,w\_100,color\_FF0000][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_pad_h_100_w_100_color_FF0000]
        
          
        [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTEyNDIzX3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTEyNDIzX3poLUNOLmpwZw 1]
 *  将图按比例缩略到原来的 1/2。
    
    [http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,p\_50][http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_p_50]
    
      
    [![aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTEyNDI1X3poLUNOLmpwZw][]][aHR0cDovL3N0YXRpYy1hbGl5dW4tZG9jLm9zcy1jbi1oYW5nemhvdS5hbGl5dW5jcy5jb20vYXNzZXRzL2ltZy80NzY5LzE1NjE2MDE1NTEyNDI1X3poLUNOLmpwZw 1]

## SDK 示例 ##

*  [Java][]
 *  [Python][]
 *  [PHP][]
 *  [Go][]
 *  [C][]
 *  [.NET][]
 *  [Android][]
 *  [Node.js][]
 *  [Browser.js][]

[ 上一篇：图片处理访问规则][Link 8]

[下一篇：内切圆 ][Link 9]

相关产品

*  [对象存储 OSS][OSS 1]
    
    阿里云对象存储服务（Object Storage Service，简称 OSS），是阿里云提供的海量、安全、低成本、高可靠的云存储服务。您可以通过调用 API，在任何应用、任何时间、任何地点上传和下载数据，也可以通过 Web 控制台对数据进行简单的管理。OSS 适合存放任意类型的文件，适合各种网站、开发企业及开发者使用。按实际容量付费真正使您专注于核心业务。
 *  [访问控制][Link 13]
    
    RAM (Resource Access Management)是阿里云为客户提供的用户身份管理与访问控制服务。使用RAM，您可以创建、管理用户账号（比如员工、系统或应用程序），并可以控制这些用户账号对您名下资源具有的操作权限。当您的企业存在多用户协同操作资源时，RAM可以按需为用户分配最小权限，从而让您避免与其他用户共享云账号密钥，降低您企业的信息安全风险。
 *  [CDN][]
    
    阿里云内容分发网络（Content Delivery Network，

[Link 1]: https://github.com/AlibabaCloudDocs/oss/blob/master/cn.zh-CN/%E6%95%B0%E6%8D%AE%E5%A4%84%E7%90%86/%E5%9B%BE%E7%89%87%E5%A4%84%E7%90%86%E6%8C%87%E5%8D%97/%E5%9B%BE%E7%89%87%E7%BC%A9%E6%94%BE.md
[Link 2]: https://help.aliyun.com/my_favorites.html
[Link 3]: https://help.aliyun.com/document_detail/44688.html?spm=5176.10695662.1996646101.searchclickresult.3b7d7392ux4GaH#title-dz0-c5s-ulp
[Link 4]: https://help.aliyun.com/document_detail/44688.html?spm=5176.10695662.1996646101.searchclickresult.3b7d7392ux4GaH#title-i3s-log-qvf
[Link 5]: https://help.aliyun.com/document_detail/44688.html?spm=5176.10695662.1996646101.searchclickresult.3b7d7392ux4GaH#title-y1e-xd2-5oo
[SDK]: https://help.aliyun.com/document_detail/44688.html?spm=5176.10695662.1996646101.searchclickresult.3b7d7392ux4GaH#title-ov0-a3i-pq9
[Link 6]: https://help.aliyun.com/document_detail/44705.html#concept-exc-qp5-vdb
[Link 7]: https://help.aliyun.com/document_detail/44703.html#concept-mf3-md5-vdb
[http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_h_100]: http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,h_100
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[http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_l_100]: http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,l_100
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[http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_fixed_h_100_w_100]: http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m_fixed,h_100,w_100
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[http_image-demo.oss-cn-hangzhou.aliyuncs.com_example.jpg_x-oss-process_image_resize_m_lfit_h_100_w_100]: http://image-demo.oss-cn-hangzhou.aliyuncs.com/example.jpg?x-oss-process=image/resize,m_lfit,h_100,w_100
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[Java]: https://help.aliyun.com/document_detail/47505.html?spm=a2c4g.11186623.2.33.7a43c1f666mcXE#concept-agt-jgc-kfb
[Python]: https://help.aliyun.com/document_detail/47660.html#concept-47660-zh
[PHP]: https://help.aliyun.com/document_detail/47735.html#concept-47735-zh
[Go]: https://help.aliyun.com/document_detail/93499.html#concept-knm-w3d-lfb
[C]: https://help.aliyun.com/document_detail/48113.html#concept-48113-zh
[.NET]: https://help.aliyun.com/document_detail/48309.html#concept-48309-zh
[Android]: https://help.aliyun.com/document_detail/93868.html#concept-qrm-ycn-mfb
[Node.js]: https://help.aliyun.com/document_detail/50039.html#concept-50039-zh
[Browser.js]: https://help.aliyun.com/document_detail/64054.html#concept-64054-zh
[Link 8]: https://help.aliyun.com/document_detail/44687.html
[Link 9]: https://help.aliyun.com/document_detail/44695.html
[Link 10]: https://help.aliyun.com/document_detail/44693.html
[OSS]: https://help.aliyun.com/document_detail/44686.html
[Link 11]: https://help.aliyun.com/document_detail/44705.html
[Link 12]: https://help.aliyun.com/document_detail/44957.html
[OSS 1]: https://www.aliyun.com/product/oss
[Link 13]: https://www.aliyun.com/product/ram
[CDN]: https://www.aliyun.com/product/cdn