Kuala Lumpur skyline after rain. An example image for which there is no perfect output medium at present: web sizes we don’t need to talk about. Full resolution screens lack the tonal resolution to render the clouds in a transparent manner; print comes closest, but ultimately is a reflective medium and so lacks the dynamic range to represent the difference between the foreground trees in deep shadow and the light in the buildings.

Let’s take stock of where we are at the moment in terms of viewing options for images: there’s basically still only digital and print. On the digital side, displays have been steadily increasing in resolution and information density – and to some extent also size; we have 4K monitors in some laptops at 14″ and under, 8K in some televisions with an enormous jump to 50″+, and the majority of devices sit in the 2-4MP range somewhere between 12″ and 30″. There are also mobile devices with HD, QHD or even 4K (the recently announced Sony Z5) resolutions in sub-6″ screens; that’s an absurdly huge range of pixel densities. Everything from about 100PPI to 800+PPI. Clearly, preparing content for this is not going to be easy; viewing distances don’t necessarily have anything to do with perceived information density (say pixels per degree of observed FOV), either. You can hold your mobile at such a distance that it subtends the same angle as your 27″ 5K iMac, but the problem is the iMac will actually have double or more of the information density – just look at the number of pixels along the long axis. Or the converse might be true. As image makers, how do we manage this?

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