Embedded Files
Images on your computer screen or images produced by a digital camera are called raster graphics. They are made up of a grid of pixels and are also known as bitmap graphics. Raster graphics have larger file sizes because they need to store more information.
Raster graphics have a number of different file formats.
Some common ones are:
BMP (Window Bitmap)
GIF (Graphics Interchange Format)
JPEG (Joint Photographic Experts Group File Interchange)
PNG (Portable Network Graphics)
TIFF (Tag Image File Format)
PSD (Adobe Photoshop)
Due to the large file size of raster graphics many of these formats have image compression to reduce the file size.
Raster graphics can be sized down without losing any quality of the image. Making a raster graphic larger, however does result in loss of quality as well as pixelization. That is where you see the individual picture elements that when put together create the overall image.
Trying to enlarge a raster graphic and not lose quality can be tricky.
This jpeg image is 244 pixels by 244 pixels.
It is clear and not pixelated.
This image shows fewer pixels per centimetre (cm) and therefore loses some of quality to this jpeg image.
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