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Welcome to Learn Images!
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An in-depth course on images for the web.
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A brief history of images on the web
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A history of images on the web, starting with the image element in 1993
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Key performance issues
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Learn ways to ensure that your image requests are as small and performant as possible.
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Vector images
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Learn about SVG, the vector image format used on the web.
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Raster images
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Discover raster images, such as JPEG, GIF, PNG, and WebP.
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Image formats: GIF
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Understand the GIF image format, along with an explanation of how image encoding works.
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Image formats: PNG
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Find out when PNG is the best image format to choose.
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Image formats: JPEG
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Learn about the most common image format on the web.
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Image formats: WebP
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Learn about WebP, and understand the difference between this format and others.
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Image formats: AVIF
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AV1 Image File Format (AVIF) is an encoding based on the open source AV1 video codec.
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Responsive images
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A deep dive into responsive images.
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Descriptive syntaxes
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Using srcset and sizes to provide the browser with information about image sources and how they'll be used.
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Prescriptive syntaxes
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Find out about the picture element.
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Automating compression and encoding
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Make generating highly performant image sources a seamless part of your development process.
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Site Generators, frameworks, and CMSs
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Discover how CMSs such as WordPress, and other site generators can make it easier to use responsive images.
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Image content delivery networks
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Learn how image CDNs have the ability to transform and optimize the contents of an image.
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Conclusion
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Some additional resources.
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