{"id":124,"date":"2008-11-11T23:52:24","date_gmt":"2008-11-11T21:52:24","guid":{"rendered":""},"modified":"2015-01-16T12:42:12","modified_gmt":"2015-01-16T10:42:12","slug":"java-image-conversion-to-byte-array","status":"publish","type":"post","link":"https:\/\/rainbowbreeze.it\/wordpress\/java-image-conversion-to-byte-array\/","title":{"rendered":"Java: Image conversion to byte[] array"},"content":{"rendered":"<p>Convertire un byte array (byte[]) in un oggetto Image e&#8217; molto semplice:<\/p>\n<pre class=\"brush: java\">\r\n\tprivate Image convertToImage(byte[] source){\r\n\tImage objImage = new Image(source);\r\n\treturn objImage;\r\n}\r\n<\/pre>\n<p>Il contrario invece, convertire un oggetto Image in un byte[] non e&#8217; proprio cosi&#8217; immediaito. Ecco lo snippet che uso, che carica direttamente da una URL un&#8217;immagine e la memorizza in un byte[]. comodo magari da usare successivamente all&#8217;interno degli elementi di una jList.<\/p>\n<pre class=\"brush: java\">\r\nprivate byte[] loadImageFromURL(String strUrl){\r\n\tint intPos;\r\n\tString strFileExt;\r\n\r\n\t\/\/guess file extension\r\n\tintPos = strUrl.lastIndexOf(\".\");\r\n\tif (intPos &gt;= 0){\r\n\t\tstrFileExt = strUrl.substring(intPos + 1);\r\n\t}else{\r\n\t\t\/\/assign default jpg extension\r\n\t\tstrFileExt = \"jpg\";\r\n\t}\r\n\r\n\ttry {\r\n\t\t\/\/load the image from the Internet\r\n\t\tImageIcon objImageIcon = new ImageIcon(new URL(strUrl));\r\n\r\n\t\t\/\/wait the loading of the image\r\n\t\tMediaTracker objMediaTracker = new MediaTracker(lstContacts);\r\n\t\tobjMediaTracker.addImage(objImageIcon.getImage(), 0);\r\n\t\tobjMediaTracker.waitForID(0, 5000);\r\n\r\n\t\t\/\/convert the image\r\n\t\tBufferedImage objBI = new BufferedImage(objImageIcon.getIconWidth(), objImageIcon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);\r\n\t\tGraphics2D g2 = objBI.createGraphics();\r\n\t\tg2.drawImage(objImageIcon.getImage(), 0, 0, null);\r\n\t\tByteArrayOutputStream baos = new ByteArrayOutputStream();\r\n\t\tImageIO.write(objBI, strFileExt, baos);\r\n\r\n\t\treturn baos.toByteArray();\r\n\r\n\t} catch (MalformedURLException ex) {\r\n\t\tLogger.getLogger(MainForm.class.getName()).log(Level.SEVERE, null, ex);\r\n\t\treturn null;\r\n\t} catch (IOException ex) {\r\n\t\tLogger.getLogger(MainForm.class.getName()).log(Level.SEVERE, null, ex);\r\n\t\treturn null;\r\n\t} catch (InterruptedException ex) {\r\n\t\tLogger.getLogger(MainForm.class.getName()).log(Level.SEVERE, null, ex);\r\n\t\treturn null;\r\n\t}\r\n}\r\n<\/pre>\n<p><!--more--><\/p>\n<p>Altri esempi trovati comportano l&#8217;uso delle JAI, le <a title=\"Java Advanced Imaging API\" href=\"http:\/\/java.sun.com\/javase\/technologies\/desktop\/media\/\" target=\"_blank\">Java Advanced Imaging API<\/a>:<\/p>\n<pre class=\"brush: java\">\r\npublic static byte[] convertImage(Image img) {\r\n\tParameterBlock pb = new ParameterBlock();\r\n\tpb.add(img) ;\r\n\tPlanarImage image = JAI.create(\"awtImage\", pb,null);\r\n\r\n\tByteArrayOutputStream stream = new ByteArrayOutputStream();\r\n\r\n\tJAI.create(\"encode\", image, stream, \"tiff\");\r\n\tbyte[] b = stream.toByteArray();\r\n\treturn b;\r\n}\r\n<\/pre>\n<p>In questo bonus script invece, viene ridimensionata un&#8217;immagine presente in un byte[] e viene restituita sottoforma di byte[] in formato jpg, pronto per essere salvata su file:<\/p>\n<pre class=\"brush: java\">\r\n\/\/ iconData is the original array of bytes\r\nImageIcon imageIcon = new ImageIcon(iconData);\r\nImage img = imageIcon.getImage();\r\n\r\nImage imageResize = img.getScaledInstance(100, 100, 0);\r\n\r\nImageIcon imageIconResize = new ImageIcon (imageResize);\r\n\r\nint resizeWidth = imageIconResize.getIconWidth();\r\nint resizeHeight = imageIconResize.getIconHeight();\r\n\r\nPanel p = new Panel();\r\nBufferedImage bi = new BufferedImage(resizeWidth, resizeHeight,\r\nBufferedImage.TYPE_INT_RGB);\r\n\r\nGraphics2D big = bi.createGraphics();\r\nbig.drawImage(imageResize, 0, 0, p);\r\n\r\nByteArrayOutputStream os = new ByteArrayOutputStream();\r\n\r\nJPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);\r\nencoder.encode(bi);\r\nbyte[] byteArray = os.toByteArray();\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Convertire un byte array (byte[]) in un oggetto Image e&#8217; molto semplice: private Image convertToImage(byte[] source){ Image objImage = new Image(source); return objImage; } Il contrario invece, convertire un oggetto Image in un byte[] non e&#8217; proprio cosi&#8217; immediaito. Ecco lo snippet che uso, che carica direttamente da una URL un&#8217;immagine e la memorizza in &hellip; <a href=\"https:\/\/rainbowbreeze.it\/wordpress\/java-image-conversion-to-byte-array\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Java: Image conversion to byte[] array<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":3,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[520],"tags":[8],"class_list":["post-124","post","type-post","status-publish","format-standard","hentry","category-dev","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Java: Image conversion to byte[] array - Rainbowbreeze<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rainbowbreeze.it\/wordpress\/java-image-conversion-to-byte-array\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java: Image conversion to byte[] array - Rainbowbreeze\" \/>\n<meta property=\"og:description\" content=\"Convertire un byte array (byte[]) in un oggetto Image e&#8217; molto semplice: private Image convertToImage(byte[] source){ Image objImage = new Image(source); return objImage; } Il contrario invece, convertire un oggetto Image in un byte[] non e&#8217; proprio cosi&#8217; immediaito. Ecco lo snippet che uso, che carica direttamente da una URL un&#8217;immagine e la memorizza in &hellip; Continue reading Java: Image conversion to byte[] array &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/rainbowbreeze.it\/wordpress\/java-image-conversion-to-byte-array\/\" \/>\n<meta property=\"og:site_name\" content=\"Rainbowbreeze\" \/>\n<meta property=\"article:published_time\" content=\"2008-11-11T21:52:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-01-16T10:42:12+00:00\" \/>\n<meta name=\"author\" content=\"Alfredo\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@rainbowbreeze\" \/>\n<meta name=\"twitter:site\" content=\"@rainbowbreeze\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Alfredo\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/\"},\"author\":{\"name\":\"Alfredo\",\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/#\\\/schema\\\/person\\\/00e63c64a3939938a7467e3aaf54f4cf\"},\"headline\":\"Java: Image conversion to byte[] array\",\"datePublished\":\"2008-11-11T21:52:24+00:00\",\"dateModified\":\"2015-01-16T10:42:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/\"},\"wordCount\":105,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/#\\\/schema\\\/person\\\/00e63c64a3939938a7467e3aaf54f4cf\"},\"keywords\":[\"Java\"],\"articleSection\":[\"Development\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/\",\"url\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/\",\"name\":\"Java: Image conversion to byte[] array - Rainbowbreeze\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/#website\"},\"datePublished\":\"2008-11-11T21:52:24+00:00\",\"dateModified\":\"2015-01-16T10:42:12+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/java-image-conversion-to-byte-array\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/rainbowbreeze.it\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Java: Image conversion to byte[] array\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/#website\",\"url\":\"https:\\\/\\\/rainbowbreeze.it\\\/\",\"name\":\"Rainbowbreeze\",\"description\":\"Alfredo Morresi&#039;s digital harbor\",\"publisher\":{\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/#\\\/schema\\\/person\\\/00e63c64a3939938a7467e3aaf54f4cf\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/rainbowbreeze.it\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/#\\\/schema\\\/person\\\/00e63c64a3939938a7467e3aaf54f4cf\",\"name\":\"Alfredo\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/wp-content\\\/uploads\\\/2021\\\/03\\\/rainbowbreeze_profile_700px.jpg\",\"url\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/wp-content\\\/uploads\\\/2021\\\/03\\\/rainbowbreeze_profile_700px.jpg\",\"contentUrl\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/wp-content\\\/uploads\\\/2021\\\/03\\\/rainbowbreeze_profile_700px.jpg\",\"width\":700,\"height\":700,\"caption\":\"Alfredo\"},\"logo\":{\"@id\":\"https:\\\/\\\/rainbowbreeze.it\\\/wordpress\\\/wp-content\\\/uploads\\\/2021\\\/03\\\/rainbowbreeze_profile_700px.jpg\"},\"description\":\"79ers, Italian, with a passion for creating environments in which great ideas can happen and people feel empowered, thanks to community dynamics and technological innovation. 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