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more codec docs.
author robcast
date Thu, 22 Oct 2015 17:07:52 +0200
parents 3e2f71bafcfb
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1416:3e2f71bafcfb 1417:e6ad329cfac8
34 You can see if the Jai-ImageIO plugin is active by checking for the 34 You can see if the Jai-ImageIO plugin is active by checking for the
35 availability of the TIFF image format under "Supported image types" on the 35 availability of the TIFF image format under "Supported image types" on the
36 [`/server/dlConfig.jsp`](http://localhost:8080/digilib/server/dlConfig.jsp) 36 [`/server/dlConfig.jsp`](http://localhost:8080/digilib/server/dlConfig.jsp)
37 status page. 37 status page.
38 38
39 Sometimes there are memory issues. Newer versions of Tomcat refuse to load 39 Sometimes there are problems with leaking memory. Newer versions of Tomcat refuse to load
40 the libraries (see JREMemoryLeakPreventionListener) and I found that in some 40 the libraries (see JREMemoryLeakPreventionListener) and I found that in some
41 cases digilib stopped reading TIFF files 41 cases digilib stopped reading TIFF files
42 after a period of running. In these cases it helped to install the JAI files in 42 after a period of running. In these cases it helped to install the JAI files in
43 Tomcats `lib/` directory or globally in the local Java JDK 43 Tomcats `lib/` directory or globally in the local Java JDK
44 installation (i.e. in the Java's 'jre/lib/ext/' directory on linux). 44 installation (i.e. in the Java's 'jre/lib/ext/' directory on linux).
45
46 If you really need to have the imageio-plugins JAR inside the web app, please consider
47 using Harald Kuhrs [IIOProviderContextListener](https://github.com/haraldk/TwelveMonkeys#deploying-the-plugins-in-a-web-app).
48
45 49
46 # Codec availability and Performance 50 # Codec availability and Performance
47 51
48 (Ubbo Veentjer, Oct 2015) 52 (Ubbo Veentjer, Oct 2015)
49 53
62 66
63 1564059 [http-apr-9092-exec-4] DEBUG digilib.image.DocuImage - ImageIO: this reader: class com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader 67 1564059 [http-apr-9092-exec-4] DEBUG digilib.image.DocuImage - ImageIO: this reader: class com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader
64 68
65 (Robert Casties, Oct 2015) 69 (Robert Casties, Oct 2015)
66 70
67 You can now use the TwelveMonkeys codecs instead of the default JAI-ImageIO by [building digilib](build-maven.html) with the Maven-Parameter `imageio=12m`: 71 You can now use the TwelveMonkeys codecs instead of the default JAI-ImageIO by just [building digilib](build-maven.html) with the Maven-Parameter `imageio=12m`:
68 72
69 mvn -Dimageio=12m package 73 mvn -Dimageio=12m package
70 74
71 # Codec performance 75 # Codec performance
72 76
73 (Ubbo Veentjer, Oct 2015) 77 (Ubbo Veentjer, Oct 2015)
74 78
75 In our tests comparing the performance of OpenJDK7, OpenJDK8, imageio-ext and TwelveMonkeys codecs we experienced the following numbers for decoding, encoding and scaling a 4968px*5968px to 50% size: 79 In our tests comparing the performance of OpenJDK7, OpenJDK8, imageio-ext and TwelveMonkeys codecs we experienced the following numbers for decoding, encoding and scaling a 4968px*5968px JPEG file with a color profile to 50% size:
76 80
77 24801 ms - OpenJDK7 81 24801 ms - OpenJDK7
78 11507 ms - OpenJDK7 with com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader 82 11507 ms - OpenJDK7 with com.twelvemonkeys.imageio.plugins.jpeg.JPEGImageReader
79 4216 ms - OpenJDK7 with imageio-ext using libjpeg-turbo 83 4216 ms - OpenJDK7 with imageio-ext using libjpeg-turbo
80 3635 ms - OpenJDK8 84 3635 ms - OpenJDK8
81 85
82 This numbers may depend on the actual implementation used, the processing power of the CPU and many other factors, to this are just meant to be a rough hint. 86 This numbers may depend on the actual implementation used, the processing power of the CPU and many other factors, to this is just meant to be a rough hint.
83 87
84 For using imageio-ext, the native library needs to be 88 For using imageio-ext, the native library needs to be
85 available with the LD_LIBRARY_PATH environment variable (compare: https://github.com/geosolutions-it/imageio-ext/wiki/TurboJPEG-plugin), also the .jar archives need to be on the classpath. 89 available with the `LD_LIBRARY_PATH` environment variable (compare: https://github.com/geosolutions-it/imageio-ext/wiki/TurboJPEG-plugin), also the .jar archives need to be on the classpath.
86 90
87 For using the TwelveMonkey Codecs we added the following jars to the tomcat lib directory, which were retrieved by maven (dependency on imageio-jpeg-3.1.2): 91 For using the TwelveMonkey Codecs we added the following jars to the tomcat lib directory, which were retrieved by maven (dependency on imageio-jpeg-3.1.2):
88 92
89 * common-image-3.1.2.jar 93 * common-image-3.1.2.jar
90 * common-lang-3.1.2.jar 94 * common-lang-3.1.2.jar