which type of file are image and sound they are distinguished by?
Answers
Answer:
digital file types
Explanation:
Digital file types describe the types and characteristics of the files produced from the digitization of original record materials at NARA, as well as the standard or most common data formats that the Digitization Services Branch uses to store digitized records.
Still Image File
A type of digital object that is created from the digitization of still image (textual documents and photographs) originals. A still image is data in which a grid or raster of picture elements (pixels) has been mapped to represent a visual subject, e.g., the page of a book or a photograph. The term raster data is often contrasted with vector data, in which geometrical points, lines, curves, and shapes are based upon mathematical equations, thus creating an image without specific mapping of data to pixels. [From the FADGI Glossary] Bit-depth, spatial resolution, and color encoding, for example, are all important characteristics of still images. Raster images can be stored in a variety of data formats, such as TIFF (.tif).
JPEG: Joint Photographic Experts Group
JPG/JFIF (Joint Photographic Experts Group/JPEG File Interchange Format) is a popular file format for storing raster image data. JFIF is the file format; JPG is the compression method JPG/JFIF is specified in the JPEG File Interchange Format and JPEG (ISO 10918). The Sustainability of Digital Formats site at the Library of Congress contains additional information about the JFIF file format as well as JPG compression encoding.
Currently, the Photographic Imaging, Microfilm and Textual Preservation Lab is using JPEG/JFIF (as well as TIFF) for most distribution files. JPEG files are well-suited for online access and use and are compressed for faster online transmission. JPEG files are created for use in NARA's Online Catalog as well as other internal databases, and for many reference requests.
NARA's JPEG/JFIF files are identified as PUID fmt/44 in the PRONOM database.
Although JPEG/JFIF is the formal full name of the file format (Joint Photographic Experts Group/JPEG File Interchange Format), the three character file name extension is JPG. We have used the three character file name here in keeping with he way the file format is most often expressed as a file name extension.
TIFF: Tagged Image File Format
TIFF (Tagged Image File Format) is a popular format for storing raster image data and is specified in TIFF Revision 6.0 from Adobe Systems. Additional information about the TIFF file format can be found at the Sustainability of Digital Formats site at the Library of Congress.
Currently, the Photographic Imaging, Microfilm and Textual Preservation Lab is using the TIFF file format for both preservation master and most reproduction master files. The TIFF file format is a stable, well-documented, widely adopted, uncompressed file format widely used for master files in the digital imaging community.
NARA's TIFF files are identified as PUID fmt/353 in the PRONOM database.
Although TIFF is the formal full name of the file format (Tagged Image File Format), the three character file name extension is TIF. We have used the three character file name here in keeping with the way the file format is most often expressed as a file name extension.
Digital file types describe the types and characteristics of the files produced from the digitization of original record materials at NARA, as well as the standard or most common data formats that the Digitization Services Branch uses to store digitized records.
Still Image File
A type of digital object that is created from the digitization of still image (textual documents and photographs) originals. A still image is data in which a grid or raster of picture elements (pixels) has been mapped to represent a visual subject, e.g., the page of a book or a photograph. The term raster data is often contrasted with vector data, in which geometrical points, lines, curves, and shapes are based upon mathematical equations, thus creating an image without specific mapping of data to pixels. [From the FADGI Glossary] Bit-depth, spatial resolution, and color encoding, for example, are all important characteristics of still images. Raster images can be stored in a variety of data formats, such as TIFF (.tif).
JPEG: Joint Photographic Experts Group
JPG/JFIF (Joint Photographic Experts Group/JPEG File Interchange Format) is a popular file format for storing raster image data. JFIF is the file format; JPG is the compression method JPG/JFIF is specified in the JPEG File Interchange Format and JPEG (ISO 10918). The Sustainability of Digital Formats site at the Library of Congress contains additional information about the JFIF file format as well as JPG compression encoding.
Currently, the Photographic Imaging, Microfilm and Textual Preservation Lab is using JPEG/JFIF (as well as TIFF) for most distribution files. JPEG files are well-suited for online access and use and are compressed for faster online transmission. JPEG files are created for use in NARA's Online Catalog as well as other internal databases, and for many reference requests.