Learn Images

An in-depth course on images for the web.

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1

Welcome to Learn Images!

Article

An in-depth course on images for the web.

2

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

3

Key performance issues

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Learn ways to ensure that your image requests are as small and performant as possible.

4

Vector images

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Learn about SVG, the vector image format used on the web.

5

Raster images

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Discover raster images, such as JPEG, GIF, PNG, and WebP.

6

Image formats: GIF

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Understand the GIF image format, along with an explanation of how image encoding works.

7

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.

11

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.

13

Prescriptive syntaxes

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Find out about the picture element.

14

Automating compression and encoding

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Make generating highly performant image sources a seamless part of your development process.

15

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.

16

Image content delivery networks

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Learn how image CDNs have the ability to transform and optimize the contents of an image.

17

Conclusion

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Some additional resources.