{"id":104,"date":"2022-05-10T16:40:09","date_gmt":"2022-05-10T15:40:09","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/?page_id=104"},"modified":"2023-06-13T14:28:17","modified_gmt":"2023-06-13T13:28:17","slug":"bitmap-graphics","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/bitmap-graphics\/","title":{"rendered":"Bitmap Graphics"},"content":{"rendered":"<p>A bitmap graphic is made up of pixels\u200b<\/p>\n<ul style=\"font-weight: 400\">\n<li data-aria-posinset=\"2\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">A pixel is a point on the screen.<\/span>\u200b<\/li>\n<li data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-usefontface=\"false\" data-contrast=\"none\">A computer screen is made up of lots of tiny pixels.<\/span>\u200b<\/li>\n<li data-aria-posinset=\"4\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">The\u00a0more small\u00a0pixels you have, the better the\u00a0<\/span><b><span data-scheme-color=\"@CAF297,6,18:60000,19:40000\" data-usefontface=\"false\" data-contrast=\"none\">resolution<\/span><\/b><span data-scheme-color=\"@CAF297,6,18:60000,19:40000\" data-usefontface=\"false\" data-contrast=\"none\">\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">of\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">the screen is. (look back in your jotter to the part on\u00a0<\/span><span data-usefontface=\"false\" data-contrast=\"none\">monitors).<\/span>\u200b<\/li>\n<li data-aria-posinset=\"5\" data-aria-level=\"2\"><span data-usefontface=\"false\" data-contrast=\"none\">We usually measure resolution in\u00a0<\/span><b><span data-usefontface=\"false\" data-contrast=\"none\">dots per inch<\/span><\/b><span data-usefontface=\"false\" data-contrast=\"none\">\u00a0(dpi)<\/span><\/li>\n<\/ul>\n<h2><span style=\"color: #ff0000\">A Bitmap graphic is made up of pixels and each pixel is converted to a binary Value<\/span><\/h2>\n<p><a href=\"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/public\/phsn5computingscience\/uploads\/sites\/10033\/2022\/06\/08094949\/Screenshot-2022-06-08-094933.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-396 aligncenter\" src=\"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/public\/phsn5computingscience\/uploads\/sites\/10033\/2022\/06\/08094949\/Screenshot-2022-06-08-094933.png\" alt=\"\" width=\"753\" height=\"532\" srcset=\"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/public\/phsn5computingscience\/uploads\/sites\/10033\/2022\/06\/08094949\/Screenshot-2022-06-08-094933.png 514w, https:\/\/blogs.glowscotland.org.uk\/glowblogs\/public\/phsn5computingscience\/uploads\/sites\/10033\/2022\/06\/08094949\/Screenshot-2022-06-08-094933-300x212.png 300w\" sizes=\"auto, (max-width: 753px) 100vw, 753px\" \/><\/a><\/p>\n<h2 data-ccp-props=\"{&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559683&quot;:0,&quot;335559685&quot;:0,&quot;335559731&quot;:0,&quot;335559737&quot;:0,&quot;335562764&quot;:2,&quot;335562765&quot;:0.8,&quot;335562766&quot;:2,&quot;335562767&quot;:0.5,&quot;335562768&quot;:2,&quot;335562769&quot;:0}\"><span style=\"color: #ff0000\"><b>Advantage of bit-mapped graphics<\/b><\/span>\u200b<\/h2>\n<ul>\n<li data-charcodes=\"8226\" data-buautonum=\"8\" data-aria-posinset=\"2\" data-aria-level=\"1\">\u00a0 the file area is fixed.\u200b\n<ul>\n<li data-ccp-props=\"{&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559683&quot;:1,&quot;335559685&quot;:897,&quot;335559731&quot;:0,&quot;335559737&quot;:0,&quot;335562764&quot;:2,&quot;335562765&quot;:0.8,&quot;335562766&quot;:2,&quot;335562767&quot;:0.5,&quot;335562768&quot;:2,&quot;335562769&quot;:0}\">The A4 page in the previous slide will need\u00a0 1.37 Mb of memory irrespective of\u200b the size of the graphic on the page.<span style=\"font-size: 1rem\">\u200b<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul style=\"font-weight: 400\">\n<li data-charcodes=\"8226\" data-buautonum=\"8\" data-aria-posinset=\"3\" data-aria-level=\"1\">\u00a0the graphic can be edited to pixel level\u200b\n<ul style=\"font-weight: 400\">\n<li data-charcodes=\"8226\" data-buautonum=\"8\" data-aria-posinset=\"3\" data-aria-level=\"1\">Very useful for magazine models who have spots !\u200b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p data-ccp-props=\"{&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559683&quot;:1,&quot;335559685&quot;:897,&quot;335559731&quot;:0,&quot;335559737&quot;:0,&quot;335562764&quot;:2,&quot;335562765&quot;:0.5,&quot;335562766&quot;:2,&quot;335562767&quot;:0.5,&quot;335562768&quot;:2,&quot;335562769&quot;:0}\">\u200b<\/p>\n<h2 data-ccp-props=\"{&quot;335551550&quot;:2,&quot;335551620&quot;:2,&quot;335559683&quot;:0,&quot;335559685&quot;:0,&quot;335559731&quot;:0,&quot;335559737&quot;:0,&quot;335562764&quot;:2,&quot;335562765&quot;:0.8,&quot;335562766&quot;:2,&quot;335562767&quot;:0.5,&quot;335562768&quot;:2,&quot;335562769&quot;:0}\"><span style=\"color: #ff0000\"><b>Disadvantage of bit-mapped graphics<\/b><\/span>\u200b<\/h2>\n<ul>\n<li>\u00a0cannot resize the image without losing resolution\u200b<\/li>\n<li>\u00a0the file size is very large\u200b<\/li>\n<li data-ccp-props=\"{&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559683&quot;:1,&quot;335559685&quot;:897,&quot;335559731&quot;:0,&quot;335559737&quot;:0,&quot;335562764&quot;:2,&quot;335562765&quot;:0.8,&quot;335562766&quot;:2,&quot;335562767&quot;:0.5,&quot;335562768&quot;:2,&quot;335562769&quot;:0}\">Compression can be used to decrease the size of these files when they are stored.\u200b\u200b<\/li>\n<li data-ccp-props=\"{&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559683&quot;:1,&quot;335559685&quot;:897,&quot;335559731&quot;:0,&quot;335559737&quot;:0,&quot;335562764&quot;:2,&quot;335562765&quot;:0.8,&quot;335562766&quot;:2,&quot;335562767&quot;:0.5,&quot;335562768&quot;:2,&quot;335562769&quot;:0}\">A graphic created on the screen using 300 dpi cannot be printed at a higher\u00a0resolution\u00a0eg\u00a0600 dpi, even if the printer is capable of this.\u200b<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A bitmap graphic is made up of pixels\u200b A pixel is a point on the screen.\u200b A computer screen is made up of lots of tiny pixels.\u200b The\u00a0more small\u00a0pixels you have, the better the\u00a0resolution\u00a0of\u00a0the screen is. (look back in your jotter to the part on\u00a0monitors).\u200b We usually measure resolution in\u00a0dots per inch\u00a0(dpi) A Bitmap graphic [&hellip;]<\/p>\n","protected":false},"author":79984,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-104","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages\/104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/users\/79984"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/comments?post=104"}],"version-history":[{"count":4,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages\/104\/revisions"}],"predecessor-version":[{"id":595,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages\/104\/revisions\/595"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/media?parent=104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}