John,
I haven't done large scale murals as I'm one of those who thinks transfer technology still doesn't offer the kind of longevity I would expect for my clientelle but I have enlarged digital images for fine art paper printing on occasion beyond reasonable norms with some success. My comments here will always relate to the state of digital photography, what anyone does with that is another matter.
I generally hate the results if the amount of interpolation required goes beyond 300%. But this is a subjective conclusion. It really depends on your needs and wants and what you think is commercially viable. I tend to be a perfectionist. This is the reason you should be considering a camera that offers as large an image file as you can afford. If you're able to shoot a 10-12 MB RAW file and then convert and edit it as a 80MB 16 bit TIFF, you'd be ahead of the game.
BTW, this brings up an important side note. How robust is your computer work station? The larger files the better DSLRs produce require muscle to edit. You need at minimum 2GB RAM and a fast processor, a good video card around 128-256 MB these days.
Re DSSI claims, have you ever seen a decent photograph of one of these projects? I haven't. You can't tell anything from a 50x50ppi image taken with a point-n-shoot there. I have been slammed for suggesting that larger, more professionally taken images might tell the story better. Its almost as if no one wants you to see a close up detail for fear someone will understand the weakness of their process. Either that or the people who've posted images take constructive criticism too personally. I've offered to photograph imaged tile and put up large files online for examination but as of this date no one who's said they'd send me tile to photograph has sent any.
Sorry to hear about Kneson Imager Unlimited. That did look promising. And you are right. The more you stomp on any image, interpolate it up, save and resave as a jpg; the image quality will go down dramatically. Most of the good folk on DSSI attempting these things are not photographers or good image editors. That's not a slam btw, just a fact. You can tell in how they describe their process. |