{"id":884,"date":"2015-09-29T11:40:35","date_gmt":"2015-09-29T11:40:35","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/?p=884"},"modified":"2015-09-29T11:42:44","modified_gmt":"2015-09-29T11:42:44","slug":"3g-jpeg-investigation","status":"publish","type":"post","link":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/09\/29\/3g-jpeg-investigation\/","title":{"rendered":"3G JPEG Investigation"},"content":{"rendered":"<p>Today the class carried out an investigation into the JPEG image compression technique. \u00a0The pupils were tasked with finding out.<\/p>\n<ul>\n<li>Why we use JPEG compression on images?<\/li>\n<li>How does JPEG compression work?<\/li>\n<li>What is JPEG good at?<\/li>\n<li>What is JPEG bad at?<\/li>\n<li>When would we use JPEG compression?<\/li>\n<\/ul>\n<p>The Pupils had to report on a powerpoint slide and include an example of a good and bad use of JPEG.<\/p>\n<p><!--more--><\/p>\n<h3><a href=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"886\" data-permalink=\"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/2015\/09\/29\/3g-jpeg-investigation\/jpg_vs_png1\/\" data-orig-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1.png\" data-orig-size=\"420,450\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"jpg_vs_png[1]\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1-280x300.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEGQaCWV1LXdlc3QtMSJHMEUCIH42LL6OxDi0tvXpH5PSJS%2FHGsCaweCDFvSq2TCEyHKuAiEAk%2BQEmee9h5vDwnl5RNKX7rtd8A3lqzEab%2BDkwqjOkMYquAUILRAFGgwyNzM1NzAxOTU0MzMiDBcd%2FLkosNEZKQUAuCqVBREO4AUGLWk7B3fI76WAdtIeiBD3znxZKPl3ZsyYs%2FrcpBuTptXJnBRn6nhOXPyFYO%2B9TuEHnnhMCDFW9LEttxOzVBN3Fp9W9kNrdR5fakEdWcoi%2BPqDA1iA8ste%2FDAoYBxucAqfnULZepQAd%2FzfldLff214EiIzLEYanUXcDnOhi%2FuCdgjGpVVcU0rzIY8XPyInf1Ppyx%2B2pwix%2BDHvA%2F%2BihEZ2Qko90yOt3MXrYnrVusLEwfwEArglNhQnF3FyAOGJogVz6BUvQHxd9neu94j5tdBXPI7C2dwCfCQZ7rOzlN%2FWashbTgDSCq8%2FR8UyLJs5BSEV6%2B9yLG3ayXogwcVMreupCmraLky%2FK6Dd2mniA8LSjdVBPbHnNJp4Gdn9QwdO3wnKNwQxDolljEuauh1E8MbN1p8iD%2B%2BBUGaq9c3IQhZhmnaL4UlsMq7ZfI9t9xr6DqJlEbIeRYfI%2FSPBdmZgDEnJYOOWzYPuSYLnCDl2napv53c2AQokSVFzJ0EvcRCxHQntEdwbeRccLfzPYPAVhZ2dz5zK5zdYm10j8GmVstiZ9OiE3cKnbWQYTdePKMcI5z2vta6xTYOMe7nZKZ51J5y%2BEdU5gYTXhgLqZk1SoEnJc0Sc0H2iyv6y%2BCq7aIg%2FEr1morM2j2otlk27OPWIYyUb7eXSEXydYy2WxAd6gUBZ2Q8cD%2BtxM%2BeDuJOG6tKgOY%2Bk9jri6OyZ%2BvgLk6KFjjK7zXS%2FXfSUOWeZebXiQQdsRv3Fcl7wGpC9bW6zoMzRva29QQp5W7zMPmoGusOCunnVULaFg0oeexm9S8vKynqudKNQvZLRSxACYPfmh9h4dns%2BpmJ6G7%2F6zbPF1WmQ2FKw4QQHbHhPCkt0x0d36jCxkVkw2Zzt0QY6sQGxBzCDFZ016pzLJ3tJzEsfqqFeciDVtLb%2BxaIMnwkJ2GMJTuu%2BuQ4X%2BhkPggl9f4rMQbmWWi9sAW%2Bbzdhw1NkEIZrzsaPzLf%2FM73CKyaveQ5wnTwB%2BMQmODsiQOoSI5JUEiW3YTpqFGXIJUJ9BG48FWFRg6EqAiAdAposS%2F%2BXZHjmegXsZ%2B6uHVSC2sqBH7OezyS3bsN7pOvcj3mmAA90alDcJOMPdixv1QewnLiVJUyo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UZSKJ42BK%2F20260624%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260624T033525Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=a237ecda80f46e082b465b6aecc123e0540eb794f76ead9b500bde297bc28896\" data-large-file=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1.png\" class=\" size-full wp-image-886 alignright\" src=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1.png\" alt=\"jpg_vs_png[1]\" width=\"420\" height=\"450\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1.png 420w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1-140x150.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEGQaCWV1LXdlc3QtMSJHMEUCIH42LL6OxDi0tvXpH5PSJS%2FHGsCaweCDFvSq2TCEyHKuAiEAk%2BQEmee9h5vDwnl5RNKX7rtd8A3lqzEab%2BDkwqjOkMYquAUILRAFGgwyNzM1NzAxOTU0MzMiDBcd%2FLkosNEZKQUAuCqVBREO4AUGLWk7B3fI76WAdtIeiBD3znxZKPl3ZsyYs%2FrcpBuTptXJnBRn6nhOXPyFYO%2B9TuEHnnhMCDFW9LEttxOzVBN3Fp9W9kNrdR5fakEdWcoi%2BPqDA1iA8ste%2FDAoYBxucAqfnULZepQAd%2FzfldLff214EiIzLEYanUXcDnOhi%2FuCdgjGpVVcU0rzIY8XPyInf1Ppyx%2B2pwix%2BDHvA%2F%2BihEZ2Qko90yOt3MXrYnrVusLEwfwEArglNhQnF3FyAOGJogVz6BUvQHxd9neu94j5tdBXPI7C2dwCfCQZ7rOzlN%2FWashbTgDSCq8%2FR8UyLJs5BSEV6%2B9yLG3ayXogwcVMreupCmraLky%2FK6Dd2mniA8LSjdVBPbHnNJp4Gdn9QwdO3wnKNwQxDolljEuauh1E8MbN1p8iD%2B%2BBUGaq9c3IQhZhmnaL4UlsMq7ZfI9t9xr6DqJlEbIeRYfI%2FSPBdmZgDEnJYOOWzYPuSYLnCDl2napv53c2AQokSVFzJ0EvcRCxHQntEdwbeRccLfzPYPAVhZ2dz5zK5zdYm10j8GmVstiZ9OiE3cKnbWQYTdePKMcI5z2vta6xTYOMe7nZKZ51J5y%2BEdU5gYTXhgLqZk1SoEnJc0Sc0H2iyv6y%2BCq7aIg%2FEr1morM2j2otlk27OPWIYyUb7eXSEXydYy2WxAd6gUBZ2Q8cD%2BtxM%2BeDuJOG6tKgOY%2Bk9jri6OyZ%2BvgLk6KFjjK7zXS%2FXfSUOWeZebXiQQdsRv3Fcl7wGpC9bW6zoMzRva29QQp5W7zMPmoGusOCunnVULaFg0oeexm9S8vKynqudKNQvZLRSxACYPfmh9h4dns%2BpmJ6G7%2F6zbPF1WmQ2FKw4QQHbHhPCkt0x0d36jCxkVkw2Zzt0QY6sQGxBzCDFZ016pzLJ3tJzEsfqqFeciDVtLb%2BxaIMnwkJ2GMJTuu%2BuQ4X%2BhkPggl9f4rMQbmWWi9sAW%2Bbzdhw1NkEIZrzsaPzLf%2FM73CKyaveQ5wnTwB%2BMQmODsiQOoSI5JUEiW3YTpqFGXIJUJ9BG48FWFRg6EqAiAdAposS%2F%2BXZHjmegXsZ%2B6uHVSC2sqBH7OezyS3bsN7pOvcj3mmAA90alDcJOMPdixv1QewnLiVJUyo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UZSKJ42BK%2F20260624%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260624T033525Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=2d525f02013dbcaeeabd4131614bb9e0159a39964dfdfe550ed5e691ee3607cb 140w, https:\/\/glow-prod-nl.s3.eu-west-1.amazonaws.com\/nl\/public\/ColtnessHS-ComputingScience\/uploads\/sites\/12638\/2015\/09\/jpg_vs_png1-280x300.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&amp;X-Amz-Security-Token=IQoJb3JpZ2luX2VjEGQaCWV1LXdlc3QtMSJHMEUCIH42LL6OxDi0tvXpH5PSJS%2FHGsCaweCDFvSq2TCEyHKuAiEAk%2BQEmee9h5vDwnl5RNKX7rtd8A3lqzEab%2BDkwqjOkMYquAUILRAFGgwyNzM1NzAxOTU0MzMiDBcd%2FLkosNEZKQUAuCqVBREO4AUGLWk7B3fI76WAdtIeiBD3znxZKPl3ZsyYs%2FrcpBuTptXJnBRn6nhOXPyFYO%2B9TuEHnnhMCDFW9LEttxOzVBN3Fp9W9kNrdR5fakEdWcoi%2BPqDA1iA8ste%2FDAoYBxucAqfnULZepQAd%2FzfldLff214EiIzLEYanUXcDnOhi%2FuCdgjGpVVcU0rzIY8XPyInf1Ppyx%2B2pwix%2BDHvA%2F%2BihEZ2Qko90yOt3MXrYnrVusLEwfwEArglNhQnF3FyAOGJogVz6BUvQHxd9neu94j5tdBXPI7C2dwCfCQZ7rOzlN%2FWashbTgDSCq8%2FR8UyLJs5BSEV6%2B9yLG3ayXogwcVMreupCmraLky%2FK6Dd2mniA8LSjdVBPbHnNJp4Gdn9QwdO3wnKNwQxDolljEuauh1E8MbN1p8iD%2B%2BBUGaq9c3IQhZhmnaL4UlsMq7ZfI9t9xr6DqJlEbIeRYfI%2FSPBdmZgDEnJYOOWzYPuSYLnCDl2napv53c2AQokSVFzJ0EvcRCxHQntEdwbeRccLfzPYPAVhZ2dz5zK5zdYm10j8GmVstiZ9OiE3cKnbWQYTdePKMcI5z2vta6xTYOMe7nZKZ51J5y%2BEdU5gYTXhgLqZk1SoEnJc0Sc0H2iyv6y%2BCq7aIg%2FEr1morM2j2otlk27OPWIYyUb7eXSEXydYy2WxAd6gUBZ2Q8cD%2BtxM%2BeDuJOG6tKgOY%2Bk9jri6OyZ%2BvgLk6KFjjK7zXS%2FXfSUOWeZebXiQQdsRv3Fcl7wGpC9bW6zoMzRva29QQp5W7zMPmoGusOCunnVULaFg0oeexm9S8vKynqudKNQvZLRSxACYPfmh9h4dns%2BpmJ6G7%2F6zbPF1WmQ2FKw4QQHbHhPCkt0x0d36jCxkVkw2Zzt0QY6sQGxBzCDFZ016pzLJ3tJzEsfqqFeciDVtLb%2BxaIMnwkJ2GMJTuu%2BuQ4X%2BhkPggl9f4rMQbmWWi9sAW%2Bbzdhw1NkEIZrzsaPzLf%2FM73CKyaveQ5wnTwB%2BMQmODsiQOoSI5JUEiW3YTpqFGXIJUJ9BG48FWFRg6EqAiAdAposS%2F%2BXZHjmegXsZ%2B6uHVSC2sqBH7OezyS3bsN7pOvcj3mmAA90alDcJOMPdixv1QewnLiVJUyo%3D&amp;X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=ASIAT7MQN47UZSKJ42BK%2F20260624%2Feu-west-1%2Fs3%2Faws4_request&amp;X-Amz-Date=20260624T033525Z&amp;X-Amz-SignedHeaders=host&amp;X-Amz-Expires=900&amp;X-Amz-Signature=a237ecda80f46e082b465b6aecc123e0540eb794f76ead9b500bde297bc28896 280w\" sizes=\"auto, (max-width: 420px) 100vw, 420px\" \/><\/a>Why?<\/h3>\n<p>We use JPEG to make an image file size smaller. This helps to store more files on a device and also allows us to send it quicker on a network.<\/p>\n<h3>How?<\/h3>\n<p>JPEG works by removing the parts of the image that the human eye would have difficulty seeing (lossy compression).<\/p>\n<h3>Good at?<\/h3>\n<p>Photographs and complicated images using lots of colours.<\/p>\n<h3>Bad at?<\/h3>\n<p>Line art or images of written text. (see image for examples of JPEG artefacts)<\/p>\n<h3>When would we use it?<\/h3>\n<p>We would use it any time we want to have a photographic type image with a very small file size.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today the class carried out an investigation into the JPEG image compression technique. \u00a0The pupils were tasked with finding out. Why we use JPEG compression on images? How does JPEG compression work? What is JPEG good at? What is JPEG bad at? When would we use JPEG compression? The Pupils had to report on a &hellip;<\/p>\n","protected":false},"author":32,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75925,17008,17007,17012,17013],"tags":[22441,125726,6535],"class_list":["post-884","post","type-post","status-publish","format-standard","hentry","category-broad-general-education","category-graphics-media-types","category-media-types","category-national-4","category-national-5","tag-compression","tag-jpeg","tag-lossy"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/884","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=884"}],"version-history":[{"count":3,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/884\/revisions"}],"predecessor-version":[{"id":889,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/posts\/884\/revisions\/889"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/media?parent=884"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/categories?post=884"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/nl\/ColtnessHS-ComputingScience\/wp-json\/wp\/v2\/tags?post=884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}