An unusual icon with three varying sizes in a single file

I have come across an interesting favicon file.

Click here to download the favicon file

Unfortunately, I am unable to upload this image file as it does not meet the required format standards.

Upon viewing the file in Windows 7, a fascinating discovery was made.

This remarkable file contains the same image at various sizes. The first page depicts one size out of the three available.

The subsequent page reveals the same image at a smaller scale.

Followed by the third page displaying the image at an even smaller size.

My curiosity is piqued - how is this feat possible? How can I create a single file with multiple versions of the same image?

This particular favicon showcases dimensions of 48px X 48px. As favicons are commonly used in web design and development, HTML and CSS tags have been employed accordingly.

htmlcssimagefavicon

Answer №1

One interesting aspect of the .ico file format is its ability to include multiple sizes of icons in a single file. This feature allows icons to be displayed at various resolutions, making them versatile for different use cases. If you want to learn more about this topic, check out these informative Wikipedia pages:

ICO (file format)

The ICO file format is specifically designed for computer icons in Microsoft Windows. It can store multiple images of varying sizes and color depths, ensuring that icons appear correctly when scaled. In Windows, any executable displaying an icon must have it stored in ICO format for proper rendering.

Favicon - HTML5 recommendation for icons in multiple sizes

In accordance with the HTML5 specification, it's recommended to provide icons in multiple sizes by using specific attributes within a link tag. Different icon formats, such as Microsoft's .ico and Macintosh's .icns files, can be included using content type declarations within the link tag.

To create such a file, you'll need a program that supports editing .ico files and offers this feature. For detailed instructions on how to make or obtain a multi-size .ico file, refer to theHow to make/get a multi size .ico file? thread on Stack Overflow.

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