Sometimes you may encounter images that look like complete inversions of the original colours. They may be on web pages, embedded in PDF or MS Word documents or in about any location. The picture may for example turn all blue to red and vice versa, so the sea looks red.
The reason for this "corruption" may be that the document reader or the original document generator was not able to handle CMYK colours. If the image uses CMYK and the document reader tries to interpret the picture as RGB, that gives inverted colours.
The solution may be to open the document in another reader, or extract the image and open it in a better image reader, that correctly interprets the colours.
The problem may not have anything to do with CMYK of course. A similar problem with red sea water appears in Picasa 2.7, when you try to read compressed NEF files from a D300.
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