Mark Stephens Mark has been working with Java and PDF since 1999 and is a big NetBeans fan. He enjoys speaking at conferences. He has an MA in Medieval History and a passion for reading.

How does Java handle different Images and ColorSpaces – Part 2

1 min read

There are lots of different ways of describing Color. As developers, we are most familiar with the RGB model, where every color is defined by mixing Red, Green and Blue together. In the print world, CMYK is very common, where colors or printed by literally mixing different amounts of Cyan, Magenta, Yellow and Key (black). You may also come across other ways of describing color such as DeviceN. There are also lots of different versions of RGB.

Java is based on RGB and partially supports other ColorSpaces. The ColorSpace class itself defines lots of constants for ColorSpaces, along with some nice methods to convert to and from RGB and CIEXYZ (a mathematical ColorSpace useful for convert to and from other ColorSpaces with).

Java Colorspaces

 

ColorSpaces can be defined using a CIE profile file and if you have one for a ColorSpace you can create an instance of the ColorSpace and convert color values between ColorSpaces). But BufferedImage itself only understands a more limited subset of formats.

BufferedImage colorspaces

Java can generally load lots of image types and allow access to the raw Image data, but it does not fully understand the data – so you will get oddly coloured images like the one in this post.

If you wanted to view a CMYK image as a BufferedImage in Java directly, you would need to convert the Image data into RGB before you could display it properly. You would need an ICC CMYK profile to create a CMYK ColorSpace and then I should you how to transform the data in this blog post.

Next time we will talk more about BufferedImages.

Why use JDeli?

If you are working with Images in Java, JDeli offers a range of advantages over ImageIO and alternatives, including:

  • prevents heap related JVM crashes
  • implements unsupported image formats
  • reduce output file size
  • improve read/write performance
  • supports threading
  • superior image scaling algorithms

Learn more about JDeli, or download to try it yourself.

Did you know...

IDRsolutions offers a whole range of online file converters to convert PDF and Microsoft Excel, Word and Office Documents to HTML5, SVG or image formats?

It is free to use for single file conversions and also includes Developer links if you want to use our commercial software for bulk conversions. Find out more on this page

Mark Stephens Mark has been working with Java and PDF since 1999 and is a big NetBeans fan. He enjoys speaking at conferences. He has an MA in Medieval History and a passion for reading.

How to read HEIC image files in Java with…

In this article, I will explain how to read HEIC files into Java as a BufferedImage. ImageIO does not read HEIC file types so...
Mark Stephens
1 min read

How to convert WMF files to SVG in java…

This article will show you how to convert WMF files into SVG files using our JDeli Java Image library. What is WMF? WMF is...
Amy Pearson
1 min read

How to write WebP images in Java

In this article, I will walk you through how to write out images as WebP images in Java. ImageIO does not support WebP images...
Mark Stephens
1 min read

Leave a Reply

Your email address will not be published. Required fields are marked *

IDRsolutions Ltd 2020. All rights reserved.