常见的两种图片显示方式_html/css_WEB-ITnose
今天在群里讨论网页中关于图片的优化,听到一个高大上的名词渐进式jpg(Progressive JPEG),查了一下又发现了标准型(Baseline JPEG)显示方式、还有png图片的交错式PNG,这才恍然大悟,原来这就是最最常见的两种图片显示方式,相信你也和我一样见到过,但说不上名字。
1.渐进式Progressive JPEG
1.1显示方式
这种显示方式目前来说是最常见的,比如qq空间、百度图片等等,其效果是:打开图片后,由于网速原因,只会显示一张比较模糊地图片样式,随着不断的加载,图片会越来越清晰,很牛逼是不是?但代价是需要消耗更多的cpu,但对现在计算机性能来说这算不了什么。
1.2如何把图片设为渐进式?
用我们强大的ps,在另存为或存储为web所用格式时勾选连续即可:
图片另存为: 存储为web所用格式:
当然,伟大的程序员们也可以用各种编程语言来处理比如c#,python,这些都能对图片进行加工,这里就不做介绍。
1.3 交错式PNG
以上是针对jpg格式的图片,对于png图片来说我们只要在另存为时勾选交错即可:
2.标准型(Baseline JPEG)
要标准型方式显示的图片目前已经不太多见了,在我的记忆力好久没见过一张大图一点点的从上到下加载进来的了,但这种显示方式估计大家一样并不陌生:
ps默认保存的类型就是标准型:
作为前端开发人员,在切图时还是建议保存为渐进式,没什么,只为更好的用户体验。

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

The article discusses the differences between HTML tags , , , and , focusing on their semantic vs. presentational uses and their impact on SEO and accessibility.
