PNG stands for Portable Network Graphic. This type of image format has many factors similar to GIF and JPEG images. It is unique though, as this format supports an alpha channel/ RGBA colour space. This alpha channel is added to the three standard colour channels (Red, Green and Blue) and can provide 256 levels of transparency. Therefore, a PNG is a better format to save images in than GIF or JPEG format, because it benefits by letting an image fade into a transparent background than a specific colour.
The reason why I have saved my images as PNG is not only because Windows Movie Maker does not accept the provided SVG format, but PNG images are high in quality.
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