Weird bug/issue discovered:
1. make a color square (or any other shape), make multiple white lines on top of that shape, expand and merge the lines into one shape. Save this group of lines and square.
2. Duplicate the above group. Select "Exclude overlapping shape areas" and expand again if necessary creating a compound shape. Trim away lines outside the square.
3. You now have two images (1 & 2) that look identical on screen. If you go to and snap to point and pull the compound path on top of the group, they will fit exactly over each other. HOWEVER, if you print this page, or copy and paste these two images to photoshop, the overlaying white expanded lines on top of the square will be fatter than the negative space lines in the compound shape, even though they should be identical.
i have tried printing to different printers, and different settings. I have tried importing the objects into photoshop. The same issue occurs.
Can anyone shed any light on this for me.
Perhaps the when doing all this work the original square had a fill and stroke and when you did all of this work the stroke continued to be applied so the paths are accurate and the space is accurate except the paths that form these spaces have a stroke.
Without seeing the objects you are referring to it is hard to tell.
You are right, the scenario you outlined would cause the effect you described, But no, that is not the case in this instance.
Square shape, filled with any color, no stroke. Other thin shapes laid on top, filled with white, also no stroke.
Could you please post screen shots of this?