matejriseksc opened a new pull request #110:
URL: https://github.com/apache/pdfbox/pull/110


   According to 
https://docs.oracle.com/javase/8/docs/api/javax/imageio/metadata/doc-files/jpeg_metadata.html
 the number of image components should be read from the 
markerSequence/sof/@numFrameComponents if you want to retrieve the number of 
the whole image.
   
   At the moment the number is being read from the first `Start Of Scan marker 
segment` (sos) xPath encounters which in our case lead to the wrong 
classification of an image as a Grayscale instead of RGB resulting in a blank 
image added to the final PDF document.


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