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Graphics are a part of many of the orders that we create, and we are happy to use customer supplied graphics for engraving on glassware. When a graphic (or text) is viewed on a computer monitor, it is usually displayed in black.  However, it is important to understand that whatever is engraved will turn frosted white on the clear glass. So, there is a bit of a “photo negative” effect…anything in black in the layout will be engraved, but it will ultimately be frosted white on the glassware. The clear glass is darker than the engraving, and so the clear parts will take on the role of “black.”
With many graphics, this change doesn’t make much of a difference.  In the simple cases of line art, text, or silhouette-type graphics, the image will really look the same whether viewed in black on white (as on the computer monitor) or viewed in frosted white on clear glass (as in the engraved version).   
The issue ends up being artwork where the eye “knows” that certain parts of an image should be white (or black).  For example, consider the image of a bride…we would expect that her dress will be white (and not black).  If an image is shown with the wrong polarity, it won’t look correct.  The result will be much like viewing the negative of a photograph….you can make out the subject matter, but it won’t look quite right.
With certain graphics, in order to preserve the relative relationship between black and white we may recommend that we invert the image before we engrave it.  We will show some examples to help illustrate this:

penguin graphic engraved glass

penguin graphic engraved on glass

skull graphic engraved glass

skull graphic engraved on glass

wolf graphic engraved glass

wolf graphic engraved on glass
Another time that image polarity is important is with photographs….please visit our Engraving Photographs page for more information.
The bottom line is that we are happy to engrave images any way that you like.  However, we do want to make sure that customers are aware of how their designs will look on glass.  Hopefully these examples have helped to illustrate this!