Exception reading a CMYK Jpeg

What steps will reproduce the problem?
1. Generate a CMYK JPG, call it selectedFile
1. Run Thumbnails.of(selectedFile).size(500, 500).toFile(thumb500File);

What is the expected output? What do you see instead?

Expected output - thumb500File created normally

Actual output: Exception raised "Incompatible color conversion"

What version of the product are you using? On what operating system? Which
version of Java (Sun/Oracle? OpenJDK?) ?

OpenJDK 7u9, Ubuntu Linux

Please provide any additional information below.

The core Java method ImageIO.read produces exactly the same exception, e.g.

BufferedImage originalImage = ImageIO.read(selectedFile);

so it looks like the issue is with Java, however other people have found 
workarounds - 
http://www.randelshofer.ch/blog/2011/08/reading-cmyk-jpeg-images-with-java-image
io/

Would it be possible to implement a workaround in Thumbnailator too? I think 
the Java issue dates back some time.

A sample JPG exhibiting the problem is attached.

Original issue reported on code.google.com by [e-mail] on 1 Nov 2012 at 12:59

Attachments:

• cmyk_sample.jpg

[GoogleCodeExporter]

Note
------
Use of "TwelveMonkeys ImageIO" fixes this particular issue.
https://github.com/haraldk/TwelveMonkeys

(Thank you for the tip, marcus!)

Original comment by [e-mail] on 21 Sep 2014 at 10:41

[coobird]

Support for CMYK JPEGs would require writing a JPEG reader that supports it, which is outside the scope of Thumbnailator. (Thumbnailator is a wrapper around the Java 2D and Image I/O APIs.)

TwelveMonkeys ImageIO provides an excellent alternative to Java’s default JPEG reader/writer, which can deal with CMYK JPEGs