hi every body ....

i have scanned images on the computer
however some images are modifed by a program :mad2:
( i thinks some kids were playing )

it not a water mark but black lines like a drawing in the microsoft paint

here is the question
is the image as it is saved the data are being replaced so appear the black lines
or the image data has been modifed so it can be reversed some how ? :idea:

what software can help ?
what procedure should i do ?