Hot answers tagged graphics
Yes. This works for any shape. Here's how: Draw a shape. Resize it to the desired size. Position the shape over the image. Select both by shift-clicking them. Choose Format → Image → Mask with Shape from the menu (these menu items are from Keynote 6.5.2, might be different for your version) Mask the image as you'd usually do (by dragging, resizing). Click ...
I think you are on the right track of optimizing images for mobile devices, but I think that the way you are going about it won't scale very well. If you just target iPhones with resized images, you're going to be supporting 5 different sizes, iPhone 6+, iPhone 6, iPhone 5/5S, iPhone 4/4S, plus the original, which isn't that bad. But what if you want to ...
Go into Settings.app and then go to Mail, Contacts, Calendars. Scroll down the to Mail section... I hope this helps!
Perhaps not truly idiot-proof, as this is from an iPhone not an iPad, but the option is the same, even though the layout is slightly different... Settings > Mail, Contacts, Calendar... switch off 'Load remote Images'
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