Create dmg with Retina background support?

Question

I need to make a dmg that support both 1x and 2x background, but there seems no info about retina in hdiutil or other tools like dropdmg. I create a normal one and it apparently blurs on Retina MBP. Any one have a solution?

Answer 1

A guess: a multirepresentation TIFF file might work, see first paragraph of this Apple link. HTH.

Answer 2

TIFF files with 2 representations work as folder background images for Retina as expected. Mac OS X 10.5, 10.7 and 10.8 show a correct BG representation depending on whether HiDPI is available or not. Unfortunately 10.6 shows oversized high resolution representation instead of a normal one, which makes it unacceptable if you're targeting 10.6 as well.