In this post, I will show you how to read SGI images in Java.
ImageIO does not support SGI file types by default so you will need to use an ImageIO plugin or an external library. I will cover how to use an Open source ImageIO plugin called TwelveMonkeys (which extends ImageIO to add SGI image support), and how to use the JDeli Image Library.
What is SGI?
SGI (Silicon Graphics Image) is a bitmap image file format for storing pixel data. It has 2-channel support (.bw for black and white), 3-channel support (rgb/bwa) and 4-channel support (rgba). The ‘a’ represents alpha.
The file name extension for SGI files is:
How to read an SGI image in Java with ImageIO
Step 1 Download TwelveMonkeys plugin and add to class path.
Step 2 Create a File handle, InputStream or URL pointing to the raw SGI image.
Step 3 ImageIO will now be able to read an SGI file into a BufferedImage. This syntax is like so:
BufferedImage image = ImageIO.read(sgiFileOrInputStreamOrURL)
How to read an SGI image in Java with JDeli
Step 1 Add JDeli to your class or module path. (download the trial jar).
Step 2 Create a File handle, InputStream pointing to the raw SGI image. You can also use a byte containing the image data.
Step 3 Read the SGI image into a BufferedImage
BufferedImage image = JDeli.read(sgiFile);
Why use JDeli to read SGI images?
JDeli offers a range of advantages over ImageIO and alternatives, including:
- prevents heap related JVM crashes
- improve read performance
- supports threading
- Support for later versions of Java and Java modules
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