{"id":6501,"date":"2015-01-06T03:59:08","date_gmt":"2015-01-06T03:59:08","guid":{"rendered":"https:\/\/dev.railscarma.com\/image-manipulation\/"},"modified":"2025-03-18T03:57:47","modified_gmt":"2025-03-18T03:57:47","slug":"bildmanipulation","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/sv\/blogg\/tekniska-artiklar\/bildmanipulation\/","title":{"rendered":"Bildmanipulation"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"6501\" class=\"elementor elementor-6501\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-11000c7f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"11000c7f\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-56f6c4ad\" data-id=\"56f6c4ad\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7e2423ef elementor-widget elementor-widget-text-editor\" data-id=\"7e2423ef\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Bildmanipulation \u00e4r en konst att transformera en bild p\u00e5 ett s\u00e4tt som du \u00f6nskar att den ska visas som, snarare \u00e4n vad originalbilden visar.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"> I applikationer relaterade till r\u00e4ls m\u00e5ste manipulation g\u00f6ras samtidigt som bilden laddas upp enligt applikationens krav som bakgrund, f\u00e4rg och storlek, vilket skulle ge ett unikt utseende till applikationerna.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong><span style=\"font-size: medium;\">Vi kan uppn\u00e5 detta genom att anv\u00e4nda ImageMagick.\u00a0<\/span><\/strong><\/span><\/p><ul style=\"text-align: justify;\"><li><span style=\"font-size: medium;\">ImageMagick \u00e4r en mjukvarusvit f\u00f6r att skapa, redigera, komponera eller konvertera bitmappsbilder.<\/span><\/li><\/ul><ul style=\"text-align: justify;\"><li><span style=\"font-size: medium;\">Vi kan anv\u00e4nda ImageMagick f\u00f6r att \u00e4ndra storlek, v\u00e4nda, spegla, rotera, f\u00f6rvr\u00e4nga, klippa och transformera bilder, justera bildf\u00e4rger, till\u00e4mpa olika specialeffekter eller rita text, linjer, polygoner, ellipser och B\u00e9zier-kurvor.<\/span><\/li><\/ul><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: medium;\"><b>Funktioner hos ImageMagick:\u00a0<\/b><\/span><\/span><\/p><ul style=\"text-align: justify;\"><li><span style=\"font-size: medium;\"><b>Formatkonvertering<\/b>: konvertera en bild fr\u00e5n ett format till ett annat (t.ex. PNG till JPEG). <\/span><\/li><li><span style=\"font-size: medium;\"><b>Omvandla<\/b>: \u00e4ndra storlek p\u00e5, rotera, besk\u00e4ra, v\u00e4nda eller trimma en bild. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Genomskinlighet<\/b>: g\u00f6r delar av en bild osynliga. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Dra<\/b>: l\u00e4gg till former eller text till en bild. <\/span><\/li><li><span style=\"font-family: Times New Roman,serif;\"><span style=\"font-size: medium;\"><b>Dekorera<\/b>: l\u00e4gg till en ram eller ram till en bild. <\/span><\/span><\/li><li><span style=\"font-size: medium;\"><b>Specialeffekter<\/b>: osk\u00e4rpa, sk\u00e4rpa, tr\u00f6skelv\u00e4rda eller tona en bild. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Animation<\/b>: skapa en GIF-animationssekvens fr\u00e5n en grupp bilder. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Text &amp; kommentarer<\/b>: infoga beskrivande eller konstn\u00e4rlig text i en bild. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Bildidentifiering<\/b>: beskriv formatet och attributen f\u00f6r en bild. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Sammansatt<\/b>: \u00f6verlappar en bild \u00f6ver en annan. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Montage<\/b>: st\u00e4ll bildminiatyrer p\u00e5 en bildduk.<\/span><\/li><\/ul><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">L\u00e4gg till gem rmagick f\u00f6r ruby eller rmagick4j f\u00f6r jruby i din gem-fil.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Genom att anv\u00e4nda gem convert_options kan vi ge alternativ f\u00f6r bakgrundsf\u00e4rg, kantf\u00e4rg, kvalitet, omstorlek, skugga etc.,<\/span><\/p><p>If you are looking for a\u00a0<a class=\"c-link c-link--underline\" href=\"https:\/\/picsart.com\/background-changer\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-stringify-link=\"https:\/\/picsart.com\/background-changer\/\" data-sk=\"tooltip_parent\">background changer<\/a>, these options allow you to modify the background seamlessly to match your desired style.<\/p><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: medium;\"><b>Bildbesk\u00e4rning:<\/b><\/span><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Implementeras med hj\u00e4lp av <i><b>gem<\/b><\/i> och <i><b>jcrop<\/b><\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Vi kan anropa jcrop direkt med id\/klass. D\u00e5 kan vi f\u00e5 den nya h\u00f6jden och bredden.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(funktion() { <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#039;#cropbox&#039;).Jcrop(); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>});<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"color: #008000;\"><span style=\"font-size: medium;\"><i><b>F\u00f6r standard besk\u00e4rningsstorlek<\/b><\/i><\/span><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(funktion() { <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#039;#cropbox&#039;).Jcrop({ <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>onChange: update_crop, <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>onSelect: update_crop, <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>setSelect: [0, 0, 500, 500], <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>bildf\u00f6rh\u00e5llande: 1 <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>}); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>});<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: medium;\"><i><b>F\u00f6r uppdatering av besk\u00e4rningsstorlek<\/b><\/i><\/span><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>function update_crop(coords) { <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#039;#crop_x&#039;).val(coords.x); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#039;#crop_y&#039;).val(coords.y); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#039;#crop_w&#039;).val(coords.w); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#039;#crop_h&#039;).val(coords.h); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>}<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><b>Referens:<\/b><\/span><a href=\"http:\/\/railscasts.com\/episodes\/182-cropping-images?view=asciicast\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-size: medium;\"> http:\/\/railscasts.com\/episodes\/182-cropping-images?view=asciicast<\/span><\/a><\/p><p style=\"text-align: justify;\"><b style=\"font-size: medium; font-style: inherit; color: #000000;\">Bildbakgrund:<\/b><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">I v\u00e5r modell kan vi l\u00e4gga till convert_option f\u00f6r bildf\u00e4ltet och vi kan st\u00e4lla in \u00f6nskad f\u00e4rg som bakgrund.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Till exempel givet rosa.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>:convert_options =&gt; {<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>:all =&gt; &#039;-background HotPink -alpha Background&#039;<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>}<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: medium;\"><b>Validering av bilddimension:<\/b><\/span><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Med hj\u00e4lp av Paperclip::Geometry kan vi st\u00e4lla in bildens bredd och h\u00f6jd till n\u00e5got v\u00e4rde.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>def file_dimensions(width = 100, height = 100)<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>dimensioner = Gem::Geometry.from_file(photo.queued_for_write[:original].path)<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>om inte dimensions.width &lt; width &amp;&amp; dimensions.height &lt; h\u00f6jd<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>errors.add :photo, &quot;Bredden m\u00e5ste vara #{width}px och h\u00f6jden m\u00e5ste vara #{height}px&quot;<\/i><\/span><\/p><p><span style=\"font-size: medium;\"><i>slutet<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>slutet<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><span style=\"font-size: medium;\">Referens:<a href=\"http:\/\/stackoverflow.com\/questions\/5454561\/rails-paperclip-how-to-check-the-image-dimensions-before-saving\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/stackoverflow.com\/questions\/5454561\/rails-paperclip-how-to-check-the-image-dimensions-before-saving<\/a><\/span><\/span><\/p><p style=\"text-align: justify;\"><b>Bilduppl\u00f6sning:<\/b><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Vi kan st\u00e4lla in bilduppl\u00f6sning med convert_options \u2192 kvalitetsalternativ.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Med detta alternativ kan vi bara st\u00e4lla in uppl\u00f6sning.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>:convert_options =&gt; {<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>:all =&gt; &#039;-kvalitet 75&#039;<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>}<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">H\u00e4r kan kvaliteten st\u00e4llas in i intervallet 0-100.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><b>Referens:<\/b><\/span><\/p><p style=\"text-align: justify;\"><a href=\"http:\/\/www.imagemagick.org\/script\/command-line-options.php\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-family: Arial,sans-serif;\"><span style=\"font-size: medium;\"><span style=\"font-size: medium;\">http:\/\/www.imagemagick.org\/script\/command-line-options.php<\/span><\/span><\/span><\/a><\/p><p style=\"text-align: justify;\"><a href=\"http:\/\/www.imagemagick.org\/script\/convert.php\"><span style=\"font-size: medium;\">http:\/\/www.imagemagick.org\/script\/convert.php<\/span><\/a><\/p><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong><span style=\"font-size: medium;\">Avslutande anm\u00e4rkning:<\/span><\/strong><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Bildmanipulationen \u00e4r d\u00e4rf\u00f6r till hj\u00e4lp f\u00f6r att omvandla bilderna enligt anv\u00e4ndarens krav och d\u00e4rmed f\u00e5 dem att k\u00e4nna att deras applikationer eller bilder \u00e4r \u00e4nnu mer attraktiva. <\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Detta g\u00f6r det m\u00f6jligt att besk\u00e4ra, rotera, \u00e4ndra storlek p\u00e5 bilderna enligt v\u00e5ra krav och har ett brett spektrum av till\u00e4mpningar i dessa dagar.<\/span><\/p><p style=\"text-align: justify;\">L\u00e4s mer :<\/p><ul><li><a href=\"\/sv\/blogg\/rals-3\/introduktionsskenor-api\/\" target=\"_blank\" rel=\"noopener noreferrer\">En introduktion till Rails API<\/a><\/li><li><a href=\"\/sv\/blogg\/tekniska-artiklar\/ett-enkelt-satt-att-oka-prestandan-for-din-rails-app-2\/\" target=\"_blank\" rel=\"noopener noreferrer\">Ett enkelt s\u00e4tt att \u00f6ka prestandan f\u00f6r din Rails-app<\/a><\/li><li><a href=\"\/sv\/blogg\/tekniska-artiklar\/ramverk-i-realtid\/\" target=\"_blank\" rel=\"noopener noreferrer\">Realtidsramverk<\/a><\/li><li><a href=\"\/sv\/blogg\/tekniska-artiklar\/installera-rubinskenor\/\" target=\"_blank\" rel=\"noopener noreferrer\">Hur man installerar Ruby p\u00e5 skenor<\/a><\/li><\/ul><p>Med geniala l\u00f6sningar, progressiva aff\u00e4rsv\u00e4rden och bepr\u00f6vad meritlista<a href=\"https:\/\/www.railscarma.com\/sv\/contact\/\">,<\/a><strong><a href=\"https:\/\/www.railscarma.com\/sv\/\" target=\"_blank\" rel=\"noopener noreferrer\"> RailsCarma<\/a><\/strong> \u00e4r b\u00e4st l\u00e4mpad att hj\u00e4lpa dig med alla dina utvecklingsbehov. V\u00e5r utvecklingsprocess \u00e4r starkt f\u00f6rankrad p\u00e5 outtr\u00f6ttlig uppm\u00e4rksamhet p\u00e5 detaljer, inklusive kvalitet, design och excellens. Vi oms\u00e4tter dina id\u00e9er till verklighet. Anslut till oss genom v\u00e5r\u00a0<a href=\"\/sv\/kontakta-oss\/\" target=\"_blank\" rel=\"noopener noreferrer\">Kontakta oss<\/a> sida.<\/p><div class=\"author-info\"><strong>Manasa Heggere <\/strong><\/div><div>\u00a0<\/div><div class=\"author-info\">Senior Ruby on Rails-utvecklare<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-14f16136 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"14f16136\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-75289f15\" data-id=\"75289f15\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4cd2801b elementor-widget elementor-widget-heading\" data-id=\"4cd2801b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Prenumerera f\u00f6r de senaste uppdateringarna<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4013b422 elementor-widget elementor-widget-shortcode\" data-id=\"4013b422\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\t\t\t\t\t<script type=\"text\/javascript\">\n\t\t\t\t\t\tvar gCaptchaSibWidget;\n                        var onloadSibCallbackInvisible = function () {\n\n                            var element = 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class=\"sib_msg_disp\">\n\t\t\t\t\t<\/div>\n                                            <div id=\"sib_captcha_invisible\" class=\"invi-recaptcha\" data-sitekey=\"6LdikOAaAAAAAJ6SWrrKVQrtw7TQpQAEnv0HS0G3\"><\/div>\n                    \t\t\t\t\t<p class=\"sib-email-area\">\r\n    <label class=\"sib-email-area\"><\/label>\r\n    <input type=\"email\" class=\"sib-email-area\" name=\"email\" required=\"required\" placeholder=\"E-postadress\">\r\n<\/p>\r\n<p class=\"sib-NAME-area\">\r\n    <label class=\"sib-NAME-area\"><\/label>\r\n    <input type=\"text\" class=\"sib-NAME-area\" name=\"NAME\" placeholder=\"namn\">\r\n<\/p>\r\n<p>\r\n    <input type=\"submit\" id=\"invisible\" class=\"sib-default-btn\" value=\"Prenumerera\">\r\n<\/p>\t\t\t\t<\/div>\n\t\t\t<input type=\"hidden\" name=\"trp-form-language\" value=\"sv\"\/><\/form>\n\t\t\t<style>\n\t\t\t\tform#sib_signup_form_1 p.sib-alert-message {\n    padding: 6px 12px;\n    margin-bottom: 20px;\n    border: 1px solid transparent;\n    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In applications related to rails manipulation has to be done while uploading the image as per the requisites of the application like back-ground, color and size, which would give &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/sv\/blogg\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby Regex Match Guide (2026) med exempel<\/span> L\u00e4s mer \u00bb<\/a><\/p>","protected":false},"author":1,"featured_media":32061,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[384],"tags":[612,613,614],"class_list":["post-6501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles","tag-image","tag-image-manipulation","tag-imagemagick"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Image Manipulation - 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