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Re:Why does Numbers hide a huge PNG file in exported Excel s... by UnoriginalGuy on Monday August 18, 2014 @09:41AM (#8192544)
That article doesn't support your conclusion. Did you draw that conclusion because the file is named "image1" in both the OP's article and that one?
Re:Why does Numbers hide a huge PNG file in exported Excel s... by louhike on Monday August 18, 2014 @10:22AM (#8192712)
According to one of the answer, it is an image to fill used by Excel. So its goal is the same, even if the picture is different.
Re:Why does Numbers hide a huge PNG file in exported Excel s... by wlesieutre on Monday August 18, 2014 @11:04AM (#8192927)
The image1.png file included by Excel is definitely an image that the author used in the spreadsheet, not a piece of cruft. Since he provides a copy of the xslx file, it's trivial to check:

http://i.imgur.com/j1A5vvC.png