显示aW3Techs调查74%网站图片均以JPEG或PNG格式并有良好理由:这些图片在所有浏览器上都很好地显示数个更新图像格式值得深思,WebP就是前导例子并相应将图像重量降低约30% 并减少网站或本地应用加载时间
WebP是一个图像格式由Google开发, 特别是高效在线加载图片,WebP压缩图片平均比JPEG高30%质量无损WebP文件可用无损压缩或损压缩保存值得注意的是WebP无损图像比PNG小26%
WebP工作Chrome Android和Opera浏览器唯一能阻阻广泛采行格式另一方面,鉴于Chrome使用量在过去几年中持续上升81%截至2019年7月W3学校调查优化图片显示
Android系统由Google开发WebP对Android效果良好具体地说:
Android项目中WebP图像阅读显示程序下载Webp库,Android项目中创建ii文件夹,并复制libwep内容并加进i/Android.mk必备配置成功编译后,你将获取libwebp.jar,它应载入项目构建路径
并用iOS制作WebP图片库libwebibwebp预编译二进制iOS或as源码.
WebP支持下列图像特征:
- 损耗或无损压缩
- 透明性
- 贝斯特2200娱乐可扩展元数据平台元数据
- 国际色联简介
- 动画
- 颜色空间*LossyWebP完全使用8bitYUV420格式免损WBP完全使用RGBA格式
JPEG、PNG和GIF图片对比WEP实例
JPEG->WebP质量:80
JPEG(15KB)
WebP(10KB)
PNG->WEP透明图像)
PNG(55KB)
WebP(39KB)
GIF->WebP质量80动画)
GIF(2.23MB)
动画WebP(887KB)
使用WebP图像格式的一个方法就是添加HTML5
标签定义各种图像属性,例如:
浏览器然后根据指定的源类型下载第一张图像,在此例WebP假设它支持该格式面向不识别浏览器
标签,通过多填方式采用WBP,例如
图片填充.
以多图像为例,不为每个图像指定WebP变量,而是利用云形自动化能力云式免费账号)像这个
上传图像到云化后,向图像URL添加参数引导云化响应性显示图像最优格式图片请求发自 Chrome或Opera时,云化格式转换为WebP
云化响应向Firefox浏览器提供JPEG格式图像和JPEG-XR格式InternetExplorer浏览器
更多细节见相关文档.
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加载代码示例
Android原创移动应用设置WebP图像格式 AndroidSDK
cloudinary.url().transformation(new Transformation().width(500).height(333).crop("fill")).fetchFormat("webp")).generate("dog.jpg")
对应URLhttps://res.www.aaaalireno.com/cld-name/image/upload/c_fill,f_webp,h_333,w_500/dog.jpg中可手动构造
云化图像质量设置定义损耗压缩深度,也影响媒体终极外观寻找图像甜点需要测试周期,例如通过将质量水平定为80和90校验图像减重并判定哪些设置更符合标准
为了避免曲解每种图像最优质量设置,使用云性q_aut选项,无可置疑地为您执行作业细节阅读此极佳文章内容.
自动化选择图像格式和质量级深入微调搭建并保存带宽,根据交付法设置视觉质量水平例举,留置默认“好”级q_aut:良好面向网站并设置生态学级q_aut:生态)本地移动应用
图片URL包含网站自动设置
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{\n\tpublicId(\"dog2.jpg\")\n\t resize(Resize.fill() { width(500)\n height(333) })\n\t delivery(Delivery.format(\n\tFormat.auto()))\n\t delivery(Delivery.quality(\n\tQuality.auto())) \n}.generate()","codeSnippet":"cloudinary.image {\n\tpublicId(\"dog2.jpg\")\n\t resize(Resize.fill() { width(500)\n height(333) })\n\t delivery(Delivery.format(\n\tFormat.auto()))\n\t delivery(Delivery.quality(\n\tQuality.auto())) \n}.generate()","status":0,"statusText":"Ok","displayName":"Kotlin","packageName":"kotlin-url-gen","packageStatus":"","packageVersion":"1.x"},{"sdkId":"jquery","framework":"jquery","language":"jquery","rawCodeSnippet":"$.cloudinary.image(\"dog2.jpg\", {width: 500, height: 333, quality: \"auto\", crop: \"fill\", fetch_format: \"auto\"})","codeSnippet":"$.cloudinary.image(\"dog2.jpg\", {width: 500, height: 333, quality: \"auto\", crop: \"fill\", fetch_format: \"auto\"})","status":0,"statusText":"Ok","displayName":"jQuery","packageName":"cloudinary-jquery","packageStatus":"","packageVersion":"2.x"},{"sdkId":"react_native","framework":"react_native","language":"react_native","rawCodeSnippet":"new CloudinaryImage(\"dog2.jpg\")\n .resize(fill().width(500).height(333))\n .delivery(format(auto()))\n .delivery(quality(auto()));","codeSnippet":"new CloudinaryImage(\"dog2.jpg\")\n .resize(fill().width(500).height(333))\n .delivery(format(auto()))\n .delivery(quality(auto()));","status":0,"statusText":"Ok","displayName":"React Native","packageName":"cloudinary-react-native","packageStatus":"","packageVersion":"0.x"}]" parsed-url="{"url":"https:\/\/res.www.aaaalireno.com\/demo\/image\/upload\/w_500,h_333,c_fill,f_auto,q_auto\/dog2.jpg","cloud_name":"demo","host":"res.www.aaaalireno.com","type":"upload","resource_type":"image","transformation":[{"width":"500","height":"333","crop_mode":"fill","format":"auto","quality":"auto"}],"transformation_string":"w_500,h_333,c_fill,f_auto,q_auto","url_suffix":"","version":"","secure":true,"public_id":"dog2.jpg","extension":"jpg","format":"jpg","format_code":true,"signature":"","private_cdn":false,"result_asset_type":"image"}" with-url="true" >
加载代码示例
Android应用配置相同的自动化代码如下:
cloudinary.url().transformation(new Transformation().width(500).height(333).crop("fill")).fetchFormat("webp").quality("auto:eco")).generate("dog.jpg")
等值URLhttps://res.www.aaaalireno.com/cldname/image/upload/c_fill,f_webp,h_333,q_auto:eco,w_500/dog.jpg
手动管理图像具有挑战性,需要大力开发,以确保对不同尺寸图像设计响应性适应各种浏览器实现进程自动化非常合情合理,特别是自此图像现在占60-65%平均网站内容云形操作简单直觉试一试
JPEG(15KB)
WebP(10KB)
PNG(55KB)
WebP(39KB)
GIF(2.23MB)
动画WebP(887KB)
