Hello guys,
By all what I am allowed to understand, EMF format is more then an image. It was designed indeed like a 'vectorial' object that can be more faithfully manipulated inside Windows applications (ex.: MS Word). Differently from a PNG, JPG or other bitmap images, it would fit the better show, when you shrink or expand it.
In certain cases, like images with little size, the results appear very interesting. I have done a comparative study, among all the options you have raised, and hope this can help to clarify things.
Below I got five images, being four captured from Word screen, and the fifth from Adobe Reader.
Those from Word are from 4 pages with the same image originally created in DataCAD XI, viewed at a 500% Zoom, and the Adobe is a 400% Zoom of the single PDF file image, created from the same source drawing.
I have created an A4 size drawing (a bit larger then A size) representing a diagonal wall with two little phrases, the first in Arial font and the other in a vectorial HLV. Obviously this do not covers the several flavours of its use, but can head to a pattern.
From the DataCAD Print Preview, I've used Paint Shop Pro to capture the image, converted it into two bitmaps formats (BMP and PNG) and inserted each one into Word.
Here are the images in Word.
FIRST: image inserted was .BMP format.
SECOND: image inserted was .PNG format.
THIRD: image inserted was Clipboarded.
FOURTH: image inserted was .EMF format.
FIFTH: image captured in Adobe Reader, at 400% Zoom.
Thanks,
Miguel