Re: Inner bleed
I almost always stop the image at the spine on perfect bound jobs. If there is cutting/folding misregistration and the image stops before the glue, it is usually not noticeable because unless you forcibly bend the pages back, the paper is parallel to the angle of view at the spine edge. I would love to always bleed past the spine, but most jobs seem to be set up as facing pages (usually in Indesign, thank God), and there is no way to bleed over the spine without changing the page on the other side of the spread. I set up the template to have zero bleed at the spine, and I usually change the inside bleed to zero in Indesign. The only time spine bleed would be desireable with facing pages is when every element either stops before the spine or crosses over it by at least .125 inch. When elements stop right at the spine (as they often do), the spine bleed would add sections of page elements from opposing pages that do not relate to the elements that would ideally bleed.
Does anyone perfect bind without grinding the spine (sort of like case-bound books where signatures are sewn at the spine, gathered, then glued)?