book module page grid not linear

Question

In my recent book effort, I tried very hard to have equal margins above and below my photos.   The book came back from Blurb with larger lower margins than upper.   I had counted squares in the page grid to equalize top and bottom.   So I just measured them with a ruler,  and the lowermost squares in the grid are slightly larger than in the uppermost squares?    Why on earth is this true and how do I get around it other than measuring on screen with a ruler for each page?

Rob_Cullen · Answer

Why? I do not have an answer.I do believe that the Grid is only a guide to cell placement, but not exact in dimensions (unlike rulers in Photoshop, etc).I see my Grid all the same size- so not sure how you can measure some "slightly larger". (a GPU problem??), but I do see that there is a partial grid at the top of my page, not at the bottom (although the 'Trim' guide seems to recognize that!)    Other considerations-You book may be guillotine trimmed by the printer slightly differently top/bottom.Your image on a page may not have fully filled the cell and not be noticed before printing.If your different margins are excessive in the printed book then it might be a question for Adobe engineers at- Photoshop Lightroom Family

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