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Hi I don't understand why BarcodeImage produces a bitmap image. However, in this situation, the Sander's solution is what I was looking for :) By the way, I think it's better to consider the "size" option of BarcodeImage, in this way ...
In the example, the plot is the tooltip; I tried with Tooltip["the transparent tooltip", Plot[x, {x, 0, 1}, Background -> Transparent], TooltipStyle -> {Background -> Transparent}] but seems it doesn't work... I attach an...
Thanks for your answer!! Now the question is: Why has the plot function the attribute HoldAll??? Thanks again :)