Extractor throws an exception on Adobe's 4 color component JPEGs.
Attached file show 4 components.

[e15ae17a-4825-4346-9d2d-ccc5bdbb5e8d - tag:medici@uiuc.edu,2009:data_hb9V-WH84ItD9Oa9Jcg6yA] : Started extraction for 'CCNI_Banner_Master.jpg'.
2011-11-09 10:38:03.126 [ExtractionServer Thread 2 Stage 1] WARNING edu.illinois.ncsa.mmdb.extractor.image.ImageExtractor.process(ImageExtractor.java:106) - JOB [e15ae17a-4825-4346-9d2d-ccc5bdbb5e8d - tag:medici@uiuc.edu,2009:data_hb9V-WH84ItD9Oa9Jcg6yA] : Could not extract thumbnails.
javax.imageio.IIOException: Incompatible color conversion
at com.sun.imageio.plugins.jpeg.JPEGImageReader.checkColorConversion(JPEGImageReader.java:927)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1028)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:984)
at javax.imageio.ImageReader.read(ImageReader.java:940)
at edu.illinois.ncsa.mmdb.extractor.image.ImageUtils.loadImage(ImageUtils.java:109)
at edu.illinois.ncsa.mmdb.extractor.image.ImageUtils.extractThumbNails(ImageUtils.java:37)
at edu.illinois.ncsa.mmdb.extractor.image.ImageExtractor.process(ImageExtractor.java:104)
at edu.illinois.ncsa.mmdb.extractor.Server$WorkerThread.run(Server.java:712)
2011-11-09 10:38:03.229 [ExtractionServer Thread 2 Stage 1] INFO edu.illinois.ncsa.mmdb.extractor.Server$WorkerThread.run(Server.java:750) - JOB [e15ae17a-4825-4346-9d2d-ccc5bdbb5e8d] : Finished stage 1
2011-11-09 10:38:03.397 [ExtractionServer Thread 3 Stage 2] INFO edu.illinois.ncsa.mmdb.extractor.Server$WorkerThread.run(Server.java:595) - JOB [e15ae17a-4825-4346-9d2d-ccc5bdbb5e8d] : Processing stage 2
2011-11-09 10:38:03.442 [ExtractionServer Thread 3 Stage 2] INFO edu.illinois.ncsa.mmdb.extractor.Server$WorkerThread.run(Server.java:656) - JOB [e15ae17a-4825-4346-9d2d-ccc5bdbb5e8d - tag:medici@uiuc.edu,2009:data_hb9V-WH84ItD9Oa9Jcg6yA] : Started extraction for 'CCNI_Banner_Master.jpg'.
2011-11-09 10:38:04.180 [ExtractionServer Thread 3 Stage 2] WARNING edu.illinois.ncsa.mmdb.extractor.image.ImageExtractor.process(ImageExtractor.java:144) - JOB [e15ae17a-4825-4346-9d2d-ccc5bdbb5e8d - tag:medici@uiuc.edu,2009:data_hb9V-WH84ItD9Oa9Jcg6yA] : Could not create pyramid.
javax.imageio.IIOException: Incompatible color conversion
at com.sun.imageio.plugins.jpeg.JPEGImageReader.checkColorConversion(JPEGImageReader.java:927)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1028)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:984)
at javax.imageio.ImageReader.read(ImageReader.java:940)
at edu.illinois.ncsa.mmdb.extractor.image.ImageUtils.loadImage(ImageUtils.java:109)
at edu.illinois.ncsa.mmdb.extractor.image.ImageExtractor.process(ImageExtractor.java:141)
at edu.illinois.ncsa.mmdb.extractor.Server$WorkerThread.run(Server.java:712)