You can use the ActiveBarcode Application to add barcodes to your image file:
Launch the ActiveBarcode Application. Now create the barcode you require. If you need
information of how to use the ActiveBarcode Application click
here

After creating the barcode you copy it into the Windows clipboard.
To do this select "Copy Bitmap" or "Copy Metafile" from the "Edit" menu (A description of the whole menu
is located here):

The barcode will now be copied to the Windows clipboard and is available for nearly any application running on
your system.
Now open your image editor software and create a new image or open an already existing image file.
Go to the "Edit" menu and select "Paste" to add the barcode image from the Windows
clipboard to your image:

The barcode will be copied into your image:

The barcode is now placed to into image.
How to place a barcode transparent above an image
First add the barcode to your image. Then set the fill method of the layer to "Multiplicate":

See this result:

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