WebP 概述
WebP的基礎知識
WebP的特點
WebP 歷史
Learn more about WebP
WebP 的好處
WebP 的缺點
WebP 質量
WebP的底層技術
WebP 損失和無損壓縮
FAQs about WebP
什麼是 WebP?
如何查看 WebP?
如何將 WebP 圖像轉換為其他格式的圖像?
我可以使用免費的 WebP 轉換器嗎?
Techincal FAQs about WebP
WebP 的最高質量價值是多少?
如何在網頁上上傳 WebP 圖像?
WebP 圖像的最大尺寸是多少?
將圖像轉換為 WebP 圖像時應該怎麼做?





WebP 損失和無損壓縮

It is often mistaken that lossless compression is better than lossy one, but it is not. They each are used for different purposes.

You may think about how you choose whether to save an image as JPG or as PNG.

You would not want to save a photo taken with a (cell phone) camera as a PNG file of lossless compression; its file size would become too big. It is more efficient to save an image showing actual objects as a JPG file of lossy compression.

On the contrary, if you need to preserve the original quality of computer-generated graphics or documents, it is preferred to save an image as a PNG file of lossless compression.

It is not desirable to determine which one is superior between lossy and lossless compression. Depending on your purpose, you should choose between the two.

Though the GIF format uses lossless compression, the format supports only 256 different colors and because of that, it also uses a quantization process reducing the number of colors used in an image. As a result, the image quality gets poorer to some degree.

Saving an image as a WebP file of lossy compression, of course, makes a difference in image quality. However, the quality deterioration caused by the WebP format's lossy compression is hardly recognizable with human eyes. You may save an image as a WebP file of lossy compression without worrying about the image quality. Learn more

WebP has support for both lossy and lossless compression, and you should choose between the two when saving an image as a WebP file.

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