While surfing the internet, I got a pdf file here... http://hariganesh.com/pdf/University%20Question%20Papers/R08/M1/M1%20R08%20MayJune%2012.pdf I need a watermarking like this file.. How to do it ? This is not a usual watermark... The watermarking is done pixel by pixel... I need to put this kind of watermark for my files.. But I dono the software.. which software is used to do this kind of watermark ? Advance thanks for the answers..