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Whether you're sending a fun pick-me-up message or a professional resume, AOL Mail makes it simple to add what you need to your messages with options to insert images, GIFs and emojis into emails, and to attach documents, images and other files. Attach files and images to an email
The only requirement was that this image was invisible, either by being the same color as the page, or by being transparent. Spacer GIFs themselves were small transparent image files. GIF files were used as it was a common format that supported transparency, unlike JPEG. These files were commonly named spacer.gif, transparent.gif or 1x1.gif.
GIF animation of an Apollonian sphere packing with transparent background. Transparency in computer graphics is possible in a number of file formats.The term "transparency" is used in various ways by different people, but at its simplest there is "full transparency" i.e. something that is completely invisible.
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The following other wikis use this file: Usage on af.wikipedia.org Aktiveringsenergie; Usage on ar.wikipedia.org طاقة تنشيط; Usage on bn.wikipedia.org
On small images, GIF can achieve greater compression than PNG (see the section on filesize, below). On most images, except for the above case, a GIF file has a larger size than an indexed PNG image. PNG gives a much wider range of transparency options than GIF, including alpha channel transparency.