{"id":81,"date":"2023-06-11T19:27:20","date_gmt":"2023-06-11T19:27:20","guid":{"rendered":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/?page_id=81"},"modified":"2023-06-11T19:27:20","modified_gmt":"2023-06-11T19:27:20","slug":"image-compression","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/","title":{"rendered":"Image Compression"},"content":{"rendered":"
\n

Compression<\/h2>\n
\n\n

Image Compression<\/h3>\n

High quality images are great, but there is a problem. As the resolution of modern cameras increases, so does the file size!<\/p>\n

A modern camera can take pictures of a resolution of up to 20 megapixels (20 million pixels) but this means that the image size will be massive!<\/p>\n

20,000,000 pixels times by 24 bits per pixel = \u00a0480,000 bits \u00a0= 60 Megabytes per image.<\/span><\/p>\n

This\u00a0would mean that if you wanted to save your photos to a CD you could only save about 13 photos to each CD!!! Argh!!!<\/p>\n

This is rubbish. What we need is a way of making image files smaller – compression.<\/p>\n

Lossless Compression ( 30 – 50 % file size reduction)<\/strong><\/p>\n

The first form of compression is called lossless compression. Lossless compress makes images smaller than their original size, without losing any of the details.<\/p>\n

TIFF is an example of a lossless file compression type.<\/p>\n

Lossy Compression (70-95% file size reduction)<\/strong><\/p>\n

The second form of compression is known as lossy<\/strong> compression. These forms of compression use complex algorithms to reduce the file size in photos, whilst minimising the noticeable reduction in file quality.<\/p>\n

\"Image<\/a>

Image quality reduction caused by too much\u00a0JPEG lossy compression. Click to enlarge<\/p><\/div>\n

Source : Wikipedia<\/a><\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Image Compression High quality images are great, but there is a problem. As the resolution of modern cameras increases, so does the file size! A modern camera can take pictures of a resolution of up to 20 megapixels (20 million pixels) but this means that the image size will be massive! 20,000,000 pixels times by… Read More »Image Compression<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"\nImage Compression - Edexcel iGCSE Computer Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Image Compression - Edexcel iGCSE Computer Science\" \/>\n<meta property=\"og:description\" content=\"Image Compression High quality images are great, but there is a problem. As the resolution of modern cameras increases, so does the file size! A modern camera can take pictures of a resolution of up to 20 megapixels (20 million pixels) but this means that the image size will be massive! 20,000,000 pixels times by… Read More »Image Compression\" \/>\n<meta property=\"og:url\" content=\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/\" \/>\n<meta property=\"og:site_name\" content=\"Edexcel iGCSE Computer Science\" \/>\n<meta property=\"og:image\" content=\"http:\/\/learnlearn.uk\/binary\/wp-content\/uploads\/sites\/11\/2017\/01\/JPEG_compression_Example.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/\",\"url\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/\",\"name\":\"Image Compression - Edexcel iGCSE Computer Science\",\"isPartOf\":{\"@id\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/#website\"},\"datePublished\":\"2023-06-11T19:27:20+00:00\",\"dateModified\":\"2023-06-11T19:27:20+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Image Compression\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/#website\",\"url\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/\",\"name\":\"Edexcel iGCSE Computer Science\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-GB\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Image Compression - Edexcel iGCSE Computer Science","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/","og_locale":"en_GB","og_type":"article","og_title":"Image Compression - Edexcel iGCSE Computer Science","og_description":"Image Compression High quality images are great, but there is a problem. As the resolution of modern cameras increases, so does the file size! A modern camera can take pictures of a resolution of up to 20 megapixels (20 million pixels) but this means that the image size will be massive! 20,000,000 pixels times by… Read More »Image Compression","og_url":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/","og_site_name":"Edexcel iGCSE Computer Science","og_image":[{"url":"http:\/\/learnlearn.uk\/binary\/wp-content\/uploads\/sites\/11\/2017\/01\/JPEG_compression_Example.jpg"}],"twitter_card":"summary_large_image","twitter_misc":{"Estimated reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/","url":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/","name":"Image Compression - Edexcel iGCSE Computer Science","isPartOf":{"@id":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/#website"},"datePublished":"2023-06-11T19:27:20+00:00","dateModified":"2023-06-11T19:27:20+00:00","breadcrumb":{"@id":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/#breadcrumb"},"inLanguage":"en-GB","potentialAction":[{"@type":"ReadAction","target":["https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/image-compression\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/"},{"@type":"ListItem","position":2,"name":"Image Compression"}]},{"@type":"WebSite","@id":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/#website","url":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/","name":"Edexcel iGCSE Computer Science","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-GB"}]}},"rttpg_featured_image_url":null,"rttpg_author":{"display_name":"learnlearnadmin","author_link":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/author\/learnlearnadmin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"Image Compression High quality images are great, but there is a problem. As the resolution of modern cameras increases, so does the file size! A modern camera can take pictures of a resolution of up to 20 megapixels (20 million pixels) but this means that the image size will be massive! 20,000,000 pixels times by… Read…","_links":{"self":[{"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/pages\/81"}],"collection":[{"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/comments?post=81"}],"version-history":[{"count":1,"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/pages\/81\/revisions"}],"predecessor-version":[{"id":84,"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/pages\/81\/revisions\/84"}],"wp:attachment":[{"href":"https:\/\/learnlearn.uk\/edexcel-igcse-computer-science\/wp-json\/wp\/v2\/media?parent=81"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}