The picture may be contained in the cell of a table - especially if the author used copy and paste to put it in your document. Float your pointer to the top of the page and see if a downward-facing solid black arrow appears, which indicates the entire page is part of a table (sometimes, it's the entire document - cells are not outlined/invisible).  From there, you can convert table to text and the image will become selectable.  NOTE: This is often the problem when you change format in one place and it affects formatting elsewhere in the document unexpectedly.  It's a real danger with copying and pasting.  If this doesn't help, center the image (if it fits) on your screen and hit Alt+PrtScr (printscreen), paste from the clipboard to MS Paint, and crop out all but the picture.  Now you can work with it however you want. 

The picture may be contained in the cell of a table - especially if the author used copy and paste to put it in your document. Float your pointer to the top of the page and see if a downward-facing solid black arrow appears, which indicates the entire page is part of a table (sometimes, it's the entire document - cells are not outlined/invisible).  From there, you can convert table to text and the image will become selectable.  NOTE: This is often the problem when you change format in one place and it affects formatting elsewhere in the document unexpectedly.  It's a real danger with copying and pasting.  If this doesn't help, center the image (if it fits) on your screen and hit Alt+PrtScr (printscreen), paste from the clipboard to MS Paint, and crop out all but the picture.  Now you can work with it however you want.