| 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> |
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| 2 | |
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| 3 | <html> |
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| 4 | |
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| 5 | <head> |
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| 6 | <title>J User's Guide - Image Buffers</title> |
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| 7 | <LINK REL="stylesheet" HREF="j.css" TYPE="text/css"> |
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| 8 | </head> |
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| 9 | |
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| 10 | <body> |
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| 11 | |
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| 12 | <a href="contents.html">Top</a> |
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| 13 | |
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| 14 | <hr> |
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| 15 | |
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| 16 | <h1>Image Buffers</h1> |
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| 17 | |
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| 18 | <hr> |
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| 19 | |
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| 20 | <p> |
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| 21 | Image buffers let you view images in several standard formats. |
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| 22 | <p> |
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| 23 | Image buffers are an experimental feature. If you want to use experimental features, |
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| 24 | add this line to your <a href="preferences.html">preferences</a> file: |
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| 25 | <pre> |
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| 26 | enableExperimentalFeatures=true |
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| 27 | </pre> |
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| 28 | You can view an image by opening an image file in any of the normal ways: the |
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| 29 | Open File dialog, on the command line when starting j, or from a directory |
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| 30 | buffer. <a href="commands.html#gotoFile">gotoFile</a>, mapped by default to |
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| 31 | Ctrl Shift G, is particularly handy in HTML and HTTP buffers. |
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| 32 | <p> |
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| 33 | The directly supported image formats are GIF and JPEG. PNG is also supported directly |
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| 34 | if you're running Java 1.3. |
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| 35 | <p> |
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| 36 | If <a href="http://java.sun.com/products/jimi">JIMI</a> is in j's CLASSPATH, |
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| 37 | additional formats are available. If you're building j from source, you'll |
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| 38 | need to edit the generated shell script and/or batch file manually to add |
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| 39 | JimiProClasses.zip to the CLASSPATH. |
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| 40 | <p> |
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| 41 | J uses a regular expression to control which files are |
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| 42 | opened in Image mode. This is the default setting: |
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| 43 | <pre> |
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| 44 | ImageMode.files=".+\\.gif|.+\\.jpe?g|.+\\.png" |
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| 45 | </pre> |
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| 46 | You can change this by specifying a different regular expression in your <a href="preferences.html">preferences</a> file. |
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| 47 | (You'll probably want to do this if you use JIMI.) |
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| 48 | <p> |
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| 49 | In Image mode, the command <a href="commands.html#imageFit">imageFit</a>, |
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| 50 | mapped by default to 'f', can be used to scale the image to fit the current |
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| 51 | edit window. The aspect ratio of the original image is preserved. |
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| 52 | <p> |
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| 53 | You can use <a href="commands.html#imageZoomIn">imageZoomIn</a>, mapped by |
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| 54 | default to '=', and <a href="commands.html#imageZoomOut">imageZoomOut</a>, |
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| 55 | mapped by default to '-', to zoom in or out on the image. |
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| 56 | <p> |
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| 57 | <a href="commands.html#imageRestore">imageRestore</a>, mapped by default to |
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| 58 | 'r', restores the image to its original size. |
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| 59 | <p> |
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| 60 | <a href="commands.html#imageCycleBackground">imageCycleBackground</a>, |
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| 61 | mapped by default to 'c', changes the background color of the image. |
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| 62 | You can use this command repeatedly to cycle through a small number of plausible |
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| 63 | background colors (currently gray, black and white). |
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| 64 | |
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| 65 | </body> |
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| 66 | |
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| 67 | </html> |
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