I'm testing some different resolutions for a folio that will be specefic to iPad and I'm having a bit of trouble.
I built a series of test images that are 1024x768, from 72-300 DPI in Photoshop. When I placed the PSD files in InDesign, the 72 DPI image places perfect, the rest of the images are all off. The higher the DPI, the smaller they are placed.
I've searched all over and only found this for an explanation:
I've got the DPS tips app on my iPad 3, and the cover photos look stunning! I've got some killer pic thats I want to really want to use this retina display for.
If someone could clue me in, I'd greatly appreciate it.
You could enlarge the higher ppi images on the page and check their effective ppi in the InDesign links panel until it gets to 72ppi, but in general I'd just unify the images to 72ppi in Photoshop before importing.
Thanks for your reply jmooring2. I don't know how making the images 72 DPI, is going to help me out. Curently, all my 72 DPI images are insufficent for a retnia display. If I've missunderstood, please let me know.
You don't need higher resolution than 72 PPI. When you create the article, everything in the background is made into a single 72-ppi image the size of the folio -- 2048x1536 72ppi for the retina iPad. Just make sure the effective ppi of any image is at least 72, and your images on the iPad 3 will look great.
If you're using 1024x768 source files for a 2048x1536 folio, yes, it's safest to use hi-res images like you're describing. When you're using 1024 source for 2048 folios, the safest approach is to make sure that the effective ppi is 144 or higher. If you create a 2048x1536 72 PPI image and scale it down to 1024x768, your effective PPI will be 144 -- you can see the effective PPI of a selected image in the Info panel. That said, even 72 ppi images look great on the iPad 3 -- it displays images really well.
Ok, I can wrap my head around that pretty easily. Personally, 72 ppi images dont look sufficent to me. However, I'm dealing with detailed photos, where pixelation can be seen very easily.
Thanks for your help with this Bob.