{"id":833,"date":"2014-11-13T09:54:46","date_gmt":"2014-11-13T17:54:46","guid":{"rendered":"http:\/\/www.imaginary-institute.com\/blog\/?p=833"},"modified":"2014-11-13T09:54:46","modified_gmt":"2014-11-13T17:54:46","slug":"interpreting-alpha","status":"publish","type":"post","link":"https:\/\/www.imaginary-institute.com\/blog\/2014\/11\/13\/interpreting-alpha\/","title":{"rendered":"Interpreting Alpha"},"content":{"rendered":"<p><a href=\"http:\/\/www.imaginary-institute.com\/resources\/TechNote10\/TechNote10.html\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright  wp-image-832\" src=\"http:\/\/www.imaginary-institute.com\/blog\/wp-content\/uploads\/2014\/11\/Writing-TechNotes-Inst-Note-10.jpg\" alt=\"Writing-TechNotes-Inst-Note-10\" width=\"335\" height=\"236\" srcset=\"https:\/\/www.imaginary-institute.com\/blog\/wp-content\/uploads\/2014\/11\/Writing-TechNotes-Inst-Note-10.jpg 446w, https:\/\/www.imaginary-institute.com\/blog\/wp-content\/uploads\/2014\/11\/Writing-TechNotes-Inst-Note-10-300x211.jpg 300w\" sizes=\"auto, (max-width: 335px) 100vw, 335px\" \/><\/a> Everyone knows about using alpha to create composite images. But what does alpha really <em>mean<\/em>? Is it how much of a pixel is covered by a fragment? Is it the opacity of the color in that pixel? Is it some combination of these things, or maybe even something else?<\/p>\n<p>The graphics literature is very fluid on this question, interpreting alpha pretty much in whatever way is most convenient on a moment-to-moment basis. In <a href=\"http:\/\/www.imaginary-institute.com\/resources\/TechNote10\/TechNote10.html\">this technical note<\/a>, we look closely at alpha and the compositing process using the <em>over<\/em> operator, and come to a clear understanding of what alpha represents.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Everyone knows about using alpha to create composite images. But what does alpha really mean? Is it how much of a pixel is covered by a fragment? Is it the opacity of the color in that pixel? Is it some combination of these things, or maybe even something else? The graphics literature is very fluid [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-833","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/posts\/833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/comments?post=833"}],"version-history":[{"count":1,"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/posts\/833\/revisions"}],"predecessor-version":[{"id":834,"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/posts\/833\/revisions\/834"}],"wp:attachment":[{"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/media?parent=833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/categories?post=833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.imaginary-institute.com\/blog\/wp-json\/wp\/v2\/tags?post=833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}