jmagick | 易学教程

Java image scaling without loading the whole image into memory

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问题 We have some very large jpgs which are used when print on A0 printers. The problem is that we need to convert this large image down to a thumbnail for use in a few java UIs. Is there any way to convert the image (with Java) without loading the whole image into memory? Currently we get out of memory exceptions when we try to load the images. Is there anything in the standard code or is my best bet to use jmagick? A pure java implementation would be best for our deployment. Thanks 回答1: I

How to get RGB values using JMagick?

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问题 How to get RGB values using JMagick(a wrapper of imagemagick) ? 回答1: If you want to get the "red" value of a specific image, on the commandline, you could use the following syntax. For the JMagick API, just look up how you'll have to translate this into API calls: identify -format "%[fx:s.p{111,111}.r]" input.jpg 0.427451 fx: is ImageMagick's special effects image operator that allows you to query all sorts of properties from an image, use them in a mathematical expression and apply them on

Convert RGB PNG to CMYK JPEG (using ICC Color Profiles)

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问题 I need to convert a PNG-File into a CMYK JPEG. During my research i've found multiple articles on SO decribing that problem. I've copied this answer using BufferedImage and ColorConvertOp . I came up with this little example: public static void main(final String[] args) throws IOException { final String imageFile = "/tmp/page0.png"; final BufferedImage pngImage = ImageIO.read(new File(imageFile)); // convert PNG to JPEG // http://www.mkyong.com/java/convert-png-to-jpeg-image-file-in-java/

How to set icc color profile in Java and change colorspace

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问题 First, I would like to say I'm not an image processing specialist. I would like to convert image colorspace from one to another, and change icc color profile at the same time. I managed to do it using JMagick (the ImageMagick Java port), but no way in pure Java (even using JAI). 回答1: Use ColorConvertOp, this will do the color space conversion. You have several options to set a icc color profile. Either you use a predefined profile by using getInstance with the correct color space constant or

jmagic x64 Can't load IA 32-bit .dll

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 今天将一个用到jmagic的项目转移到另一台服务器，本来以为很简单的事情，最终耗费了4个小时。原来机器是x32的jdk，按照网上教程来没有任何问题，新机器是x64的jdk，便是噩梦的开始。按照教程配置完测试，提示：Can't load IA 32-bit .dll on a AMD 64-bit platform，先是去搜x64的jmgick.dll，没有找到，不死心又去折腾了一个x64的ImageMagic来安装还是一样报错。网上建议将64的jdk 后来搜到一篇文章介绍说对于x32 dll的兼容性，建议放到SystemWOW64里面即可解决问题，立马剪切过去重启还是不好用提示缺少dll，最后经过了2个多小时的折腾，从stackoverflow上找到一个靠谱的答案，除了将x32的dll放到SystemWOW64中，还需要将SystemWOW64加到环境变量中，其实也不难，就是当时很难往这方面想。最后，不得不吐槽一下中国的“局域网”,最近谷歌国外都不稳定，stackoverflow上的那篇文章早搜到了，就是打不开，额外折腾了这么久。 -------------------------update 2014-06-20 ------------------ 早上起来仔细看了下

JMagick Error when trying to load a file - UnsatisfiedLink

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问题 java.lang.UnsatisfiedLinkError: no JMagick in java.library.path at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1754) at java.lang.Runtime.loadLibrary0(Runtime.java:823) at java.lang.System.loadLibrary(System.java:1045) when trying to use the code ImageInfo info; try { info = new ImageInfo(); //image = new MagickImage(info); } catch (MagickException e) { logger.error(InsightsHelper.getStackTrace(e)); } any ideas why this is happening? I'm using eclipse on OSX 回答1: You need to add the

How to convert colorspace using JMagick?

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问题 How do I convert colorspace using JMagick API? For example CMYK --> RGB and RGB --> CMYK. 来源： https://stackoverflow.com/questions/4492766/how-to-convert-colorspace-using-jmagick

jMagick - image comparision

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问题 I am trying to develop a program which would take the snapshot of webpage and will then compare it to an old one and highlight the changes if any. I am using Selenium- WebDriver for taking snapshots. For image processing and compare, after a bit googling I found jMagick, a Java interface for ImageMagick, which I think would be best fit for my requirement. But due to lack of proper documentation, I am not able to find anything relevant. If anyone could help me out with any code sample for

Convert RGB PNG to CMYK JPEG (using ICC Color Profiles)

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I need to convert a PNG-File into a CMYK JPEG. During my research i've found multiple articles on SO decribing that problem. I've copied this answer using BufferedImage and ColorConvertOp . I came up with this little example: public static void main(final String[] args) throws IOException { final String imageFile = "/tmp/page0.png"; final BufferedImage pngImage = ImageIO.read(new File(imageFile)); // convert PNG to JPEG // http://www.mkyong.com/java/convert-png-to-jpeg-image-file-in-java/ final BufferedImage rgbImage = new BufferedImage(pngImage.getWidth(), pngImage.getHeight(), BufferedImage

How to convert colorspace using JMagick?

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How do I convert colorspace using JMagick API? For example CMYK --> RGB and RGB --> CMYK. 来源： https://stackoverflow.com/questions/4492766/how-to-convert-colorspace-using-jmagick