I have found some really complicated fixes for this issue on other forums, mostly relating to fixing the quality of rotated PNG and JPEG images, but I am wondering if there isn't a simpler solution since I am just working with a rectangle created in InDesign. I am creating a pretty simple image of a silhouette of a bookshelf. I want some of the books on the bookshelf to be leaning so I have rotated them slightly. When I do that, the edges become very jagged. It is less noticeable once I export the document to a PDF, but you can still tell that the tilted rectangles don't have smooth straight edges like the rest. I have the display performance on high quality so that's not it.... It's not really important enough to go through a long complicated process to fix it, is there an easy fix/ workaround for this problem?
1 Correct answer
If a rotated line looks jagged on the screen it has to do with antialiasing settings on screen and the screen resolution. On print, it should be ok.
BTW you should make this task in Illustrator. Don't use PNG for that.
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It looks like you did exactly what I did, your edges are a bit distorted but not like mine were. If Willi is correct then it won't matter much as long as it looks right when I print, but I was able to get it to look a bit smoother in InDesign by adding outline to the shape after tilting it. Maybe that is why yours aren't as distorted as mine were, your shape is outline only and mine had none. For shites and giggles this is the almost finished product.
Thank you! I hope you are correct as I have not done a test print yet. Thank you for the advice, unfortunately I don't have Illustrator, just InDesign 
This isn't a PNG though I drew it in InDesign.
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