{"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":"image-manipulation","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/it\/blog\/articoli-tecnici\/image-manipulation\/","title":{"rendered":"Manipolazione delle immagini"},"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;\">Image Manipulation is an art of transforming an image in a way you desire it to be exhibited as, rather than what the original image exhibits.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"> 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 a unique look to the applications.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong><span style=\"font-size: medium;\">We can achieve this by using ImageMagick.\u00a0<\/span><\/strong><\/span><\/p><ul style=\"text-align: justify;\"><li><span style=\"font-size: medium;\">ImageMagick is a software suite to create, edit, compose, or convert bitmap images.<\/span><\/li><\/ul><ul style=\"text-align: justify;\"><li><span style=\"font-size: medium;\">We can use ImageMagick to re-size, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and B\u00e9zier curves.<\/span><\/li><\/ul><p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: medium;\"><b>Features of ImageMagick :\u00a0<\/b><\/span><\/span><\/p><ul style=\"text-align: justify;\"><li><span style=\"font-size: medium;\"><b>Format conversion<\/b>: convert an image from one format to another (e.g. PNG to JPEG). <\/span><\/li><li><span style=\"font-size: medium;\"><b>Transform<\/b>: re-size, rotate, crop, flip or trim an image. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Transparency<\/b>: render portions of an image invisible. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Draw<\/b>: add shapes or text to an image. <\/span><\/li><li><span style=\"font-family: Times New Roman,serif;\"><span style=\"font-size: medium;\"><b>Decorate<\/b>: add a border or frame to an image. <\/span><\/span><\/li><li><span style=\"font-size: medium;\"><b>Special effects<\/b>: blur, sharpen, threshold, or tint an image. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Animation<\/b>: create a GIF animation sequence from a group of images. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Text &amp; comments<\/b>: insert descriptive or artistic text in an image. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Image identification<\/b>: describe the format and attributes of an image. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Composite<\/b>: overlap one image over another. <\/span><\/li><li><span style=\"font-size: medium;\"><b>Montage<\/b>: juxtapose image thumbnails on an image canvas.<\/span><\/li><\/ul><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Add gem rmagick for ruby or rmagick4j for jruby in your gem file.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Using paperclip convert_options we can give options for background-color, border-color, quality, re-size, shadow 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>Image Crop :<\/b><\/span><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Is implemented using <i><b>paperclip<\/b><\/i> E <i><b>jcrop<\/b><\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">We can directly call jcrop using id\/class. Then we can get the new height and width.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(function() { <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#8216;#cropbox&#8217;).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>For default crop size<\/b><\/i><\/span><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(function() { <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#8216;#cropbox&#8217;).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>aspectRatio: 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>For Update Crop Size<\/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>$(&#8216;#crop_x&#8217;).val(coords.x); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#8216;#crop_y&#8217;).val(coords.y); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#8216;#crop_w&#8217;).val(coords.w); <\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>$(&#8216;#crop_h&#8217;).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>Riferimento:<\/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;\">Image Background:<\/b><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">In our model we can add convert_option for the image field and we can set the required color as background.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">For example given pink.<\/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; &#8216;-background HotPink -alpha Background&#8217;<\/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>Image Dimension Validation:<\/b><\/span><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Using Paperclip::Geometry we can set the image width and height to some value.<\/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>dimensions = Paperclip::Geometry.from_file(photo.queued_for_write[:original].path)<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>unless dimensions.width &lt; width &amp;&amp; dimensions.height &lt; height<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>errors.add :photo, &#8220;Width must be #{width}px and height must be #{height}px&#8221;<\/i><\/span><\/p><p><span style=\"font-size: medium;\"><i>FINE<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><i>FINE<\/i><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><span style=\"font-size: medium;\">Riferimento:<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>Image Resolution:<\/b><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">We can set image resolution using convert_options \u2192 quality option.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">Using this option we only can set resolution.<\/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; &#8216;-quality 75&#8217;<\/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;\">Here quality can be set in range of 0-100.<\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\"><b>Riferimento:<\/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;\">Nota conclusiva:<\/span><\/strong><\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">The Image Manipulation is hence helpful in transforming the images as per the requirements of the user and hence making them feel their applications or images are even more attractive. <\/span><\/p><p style=\"text-align: justify;\"><span style=\"font-size: medium;\">This allows to crop, rotate, re-size the images as per our requirements and has a wide range of applicability in these days.<\/span><\/p><p style=\"text-align: justify;\">Per saperne di pi\u00f9 :<\/p><ul><li><a href=\"\/it\/blog\/binari-3\/introduzione-guide-api\/\" target=\"_blank\" rel=\"noopener noreferrer\">Un&#039;introduzione all&#039;API Rails<\/a><\/li><li><a href=\"\/it\/blog\/articoli-tecnici\/a-simple-way-to-increase-the-performance-of-your-rails-app-2\/\" target=\"_blank\" rel=\"noopener noreferrer\">Un modo semplice per aumentare le prestazioni della tua app Rails<\/a><\/li><li><a href=\"\/it\/blog\/articoli-tecnici\/quadro-in-tempo-reale\/\" target=\"_blank\" rel=\"noopener noreferrer\">Quadro in tempo reale<\/a><\/li><li><a href=\"\/it\/blog\/articoli-tecnici\/installare-le-rotaie-ruby\/\" target=\"_blank\" rel=\"noopener noreferrer\">Come installare Ruby sui binari<\/a><\/li><\/ul><p>With ingenious solutions, progressive business values, and proven track record<a href=\"https:\/\/www.railscarma.com\/it\/contact\/\">,<\/a><strong><a href=\"https:\/\/www.railscarma.com\/it\/\" target=\"_blank\" rel=\"noopener noreferrer\"> RailsCarma<\/a><\/strong> \u00e8 pi\u00f9 adatto per aiutarti con tutte le tue esigenze di sviluppo. Il nostro processo di sviluppo si basa fortemente sull&#039;instancabile attenzione ai dettagli, tra cui qualit\u00e0, design ed eccellenza. Trasformiamo le tue idee in realt\u00e0. 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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\/it\/blog\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby Regex Match Guide (2026) with Examples<\/span> Leggi altro \"<\/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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Ruby on Rails Development Company specializing in Offshore Development\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/RailsCarma\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-01-06T03:59:08+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-18T03:57:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2015\/01\/image-manipulation.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@railscarma\" \/>\n<meta name=\"twitter:site\" content=\"@railscarma\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.railscarma.com\/blog\/technical-articles\/image-manipulation\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/technical-articles\/image-manipulation\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\/\/www.railscarma.com\/#\/schema\/person\/5f2228a2dec7549056e709de6eb85d21\"},\"headline\":\"Image Manipulation\",\"datePublished\":\"2015-01-06T03:59:08+00:00\",\"dateModified\":\"2025-03-18T03:57:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/technical-articles\/image-manipulation\/\"},\"wordCount\":648,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.railscarma.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.railscarma.com\/blog\/technical-articles\/image-manipulation\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2015\/01\/image-manipulation.jpg\",\"keywords\":[\"image\",\"image manipulation\",\"ImageMagick\"],\"articleSection\":[\"Technical Articles\"],\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.railscarma.com\/blog\/technical-articles\/image-manipulation\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.railscarma.com\/blog\/technical-articles\/image-manipulation\/\",\"url\":\"https:\/\/www.railscarma.com\/blog\/technical-articles\/image-manipulation\/\",\"name\":\"Image Manipulation - 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