APNG: A Quick Guide to Animated PNG Files

What is an APNG File?

An APNG file is a valid PNG image file that cleverly uses file metadata to compress and store the frames of a full animation. This results in smaller files with higher quality compared to animated GIF files.

How to Create an APNG File in MATLAB

Using exportgraphics

1. In MATLAB 2022a, use the exportgraphics function with the Append option within a loop.
2. Export each image using the '-transparent' argument.

Using animatedPNGWriter Class

1. Use the animatedPNGWriter class to create APNG files specifically.
2. Import each image using imread within a loop.
3. Add the images to the animatedPNGWriter object.

Applications of APNG Files

APNG files have various applications similar to animated GIF files, such as:

• Creating simple animations for websites
• Displaying animated logos and icons
• Generating animated presentations and tutorials

Advantages of APNG over GIF

• Higher image quality
• Smaller file size
• Transparency support
• Better color depth