{"id":742,"date":"2015-03-31T13:58:28","date_gmt":"2015-03-31T13:58:28","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/?p=742"},"modified":"2015-03-31T13:58:28","modified_gmt":"2015-03-31T13:58:28","slug":"media-types","status":"publish","type":"post","link":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/03\/31\/media-types\/","title":{"rendered":"Media Types"},"content":{"rendered":"<ul>\n<li>Standard file formats:\n<ul>\n<li>Text: txt, rtf<\/li>\n<li>Audio: wav, mp3<\/li>\n<li>Graphics: jpeg, bmp, gif, png<\/li>\n<li>Video: mp4, avi<\/li>\n<li>Pdf<\/li>\n<\/ul>\n<\/li>\n<li>Factors affecting file size and quality, including resolution, colour depth, sampling rate<\/li>\n<li>Calculation of file size for colour bitmap<\/li>\n<li>Need for compression<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h3>Standard file formats:<\/h3>\n<ul>\n<li>Text:\n<ul>\n<li><strong>txt<\/strong> &#8211; Only stores text, no formating or fonts are stored. Very small file size<\/li>\n<li><strong>rtf<\/strong> &#8211; Rich Text Format, formating information and graphics are stored as text.<\/li>\n<\/ul>\n<\/li>\n<li>Audio:\n<ul>\n<li><strong>wav<\/strong> &#8211; uncompressed audio file format<\/li>\n<li><strong>mp3<\/strong> &#8211; Compressed audio file format<\/li>\n<\/ul>\n<\/li>\n<li>Graphics:\n<ul>\n<li><strong> jpeg<\/strong> &#8211; lossy compression &#8211; used for photos, small file size<\/li>\n<li><strong>bmp<\/strong> &#8211; Bitmap, uncompressed, large file size<\/li>\n<li><strong>gif<\/strong> &#8211; Lossless compression, only 256 colours, used for animations and clip art, supports transparency<\/li>\n<li><strong> png<\/strong> &#8211; Lossless compression, Millions of colours, supports partial transparency<\/li>\n<\/ul>\n<\/li>\n<li>Video:\n<ul>\n<li><strong>mp4<\/strong> &#8211; Compressed file format<\/li>\n<li><strong>avi<\/strong> &#8211; Uncompressed file format<\/li>\n<\/ul>\n<\/li>\n<li><strong>Pdf<\/strong>: Portable Document Format &#8211; stores all formatting information and font details so that the document looks identical on all computers.<\/li>\n<\/ul>\n<h3>\nFactors affecting file size and quality<\/h3>\n<ul>\n<li><strong>resolution<\/strong> &#8211; the number of pixels used to make up the picture.<\/li>\n<li><strong>colour depth<\/strong> &#8211; the number of possible colours used to make up a pixel. The more possible colours the greater the file size.<\/li>\n<li><strong>sampling rate<\/strong> &#8211; in sound files the number of recordings taken per second., the greater the sample rate the higher the quality and file size.<\/li>\n<\/ul>\n<h3><strong><\/strong><\/h3>\n<h3>Calculation of file size for colour bitmap<\/h3>\n<p><strong>Formula<\/strong><\/p>\n<p>Number of pixels = image width x resolution x image height x resolution<\/p>\n<p><strong>Example 1<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/pixels.jpg\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"690\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/03\/10\/low-level-operations-and-computer-architecture\/pixels\/\" data-orig-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/pixels.jpg\" 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150w, https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/03\/pixels.jpg 993w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>This is enlarged but is 1 inch by 1 inch at 22 Dots Per Inch. In that case there are 22 x 1 x 22 x 1 = 484\u00a0pixels<\/p>\n<p><strong>Example 2<\/strong><\/p>\n<p>Bitmap with a resolution of 600&#215;600 pixels in 8 bit colour.<\/p>\n<p>Storage requirements<\/p>\n<pre style=\"padding-left: 30px\">600 x 600 x 1 bytes = 360000 \r\nIt is 1 byte as it is 8 bits per pixel \r\n360000\/1024 = 351.6 kilobytes<\/pre>\n<p><strong>Example 3<\/strong><\/p>\n<p>Calculate the number of pixels in 4 inch by 5 inch photograph scanned which has a resolution of 600 dots per inch.<\/p>\n<pre style=\"padding-left: 30px\">Pixels = 4 x 600 x 5 x 600 = 7,200,000 pixels\r\n1pixel = 1 bit \r\n7,200,000 \/ 8 = 90000 bytes \r\n90000 bytes \/ 1024 = 878.9 Kb<\/pre>\n<h3>\nNeed for compression<\/h3>\n<p>Compression reduces the file size so that the web page loads more quickly. Reducing bit depth has the same impact. Quality of the image is affected.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Standard file formats: Text: txt, rtf Audio: wav, mp3 Graphics: jpeg, bmp, gif, png Video: mp4, avi Pdf Factors affecting file size and quality, including resolution, colour depth, sampling rate Calculation of file size for colour bitmap Need for compression<\/p>\n","protected":false},"author":32,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4250,17008,17010,17007,375],"tags":[],"class_list":["post-742","post","type-post","status-publish","format-standard","hentry","category-audio","category-graphics-media-types","category-information-systems-development","category-media-types","category-video"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/742","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/users\/32"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/comments?post=742"}],"version-history":[{"count":1,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/742\/revisions"}],"predecessor-version":[{"id":743,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/742\/revisions\/743"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/media?parent=742"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/categories?post=742"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/tags?post=742"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}