Bitmap images

Unlike metafiles, bitmaps maintain the resolution with which they were created, so that although a bitmap image may be resized at will, the individual dots of the bitmap also get resized. When dBarcode saves a bitmap image it does so with the resolution specified by the iPixelGain property – which is the value specified as the Target resolution in the Graphics option dialog.

The user is recommended to use a target resolution equal to the resolution of the intended printer. ALL barcode images should be tested in their final form before extensive print runs are undertaken.

Reference