Hairlines really stress me out. I know they hardly ever print, but I always like to doublecheck by opening up pdfs i've made through indesign, in photoshop. Normally this calms me down as the hairlines never appear.
BUT...they do in PS 6.0...why is this? The same pdf opened in PS 5.1 = no hairlines. PS 6.0 = HAIRLINES!!!
This only seems to happen when i've made the pdf with Acrobat 4 (PDF 1.3) / PDF/X-1a:2001 settings - as I was told it's always safer to flatten transparencies...is this correct too?
Should i be using a different Compatibility?
Is there a way i can check my files once and for all for any hairlines issues before i send them off to print?
please help...thank you!!
It's the flattening of transparency which causes the hairlines to appear. Here's why:
If you choose a compatiblity of Acrobat 5 or higher (no transparency flattening), then you won't see them.
As to whether flattening is required for your particular commercial printer, that's what you'll have to ask them.
I don't get why you would want to open up the PDF in Photoshop.
If you don't want the hairlines, export with Acrobat 5 or higher compatibility, then open in Photoshop (for whatever reason you need to).