I need some help . I got a pdf file which was edited using exchange viewer and flattened. For example lines have been drawn in red and flattened. I want to change the color to black so i am placing a box over the line and selecting the property as screen .its not masking the news lines(red colour lines) but changing the color of the existing drawings.if i change the property of the box to hue ....on screen its showing changed to black but print is showing a black box or even when flattened it is showing black box. Please please please help.