I think a good watermark background should be between 10 % - 15 % opaque .
我认为一个好的水印背景的透明度应该在10%－15%之间。
If the background is light then the watermark should obviously also be fairly light and vice versa .
如果背景是淡色的，那么水印当然也要是适度的淡色，反之亦然。
Because of the difficulty of getting an application through icann 's process , a personalized domain ending will be an authenticity watermark of sorts .
Others guard against the small number of counterfeit zimbabwean bills rumored to be in the market by studying the watermark , signature and serial numbers that distinguish genuine bills .
The new notes incorporated additional features , such as holograms that change color when the note is tilted , and vertical watermark bars that become visible when the note is held into light .
