This means that files may degrade in quality when they are JPEG encoded. JPG (more accurately JFIF) files are true color (16.7 million colors, or 24-bit) images that are compressed using a lossy compression algorithm called JPEG. JPEG stands for Joint Photographics Experts Group. GIF files are encoded, 256 color (8-bit) images which use a lossless compression technique and can be opened by almost all graphics programs including xv, Lview, and Photoshop. GIF, which stands for Graphics Interchange Format, is a graphics file format originally popularized by Compuserve. All of the following formats are raster formats unless otherwise stated. The following list of image file formats is not inclusive, but describes the formats that comprise the majority of files encountered on the Internet. However, lossy formats tend to be much smaller than their lossless counterparts, and for most photographic images, there will be almost no subjective difference. For example, when converting from a GIF (lossless) to a JPEG (lossy), some information is lost. Lossy formats lose resolution (sharpness) when converted to, while lossless formats preserve image information. Raster formats can be generally separated into two categories. A vector format is created almost always by a drawing/CAD program and consists not of pixels, but objects such as curves, shades, and characters. A raster image is one composed of a field of pixels, each characterized by a color, and is usually created in paint programs, by scanning a picture or by grabbing an image. The data will be stored in a raster or a vector file format.
I hope you're excited to dive into the Confluence with this course.A single still video image, whether created by a drawing or paint program or scanned from a book or grabbed with a video camera, can be stored in any of a wide variety of file formats.
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