Update on DPM2 huge print by Diglloyd:

Started Aug 3, 2013 | Discussions thread
Laurence Matson
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On huge prints and printing
In reply to mrkr, Aug 3, 2013

mrkr wrote:

http://diglloyd.com/blog/2013/20130802_3-SigmaDPMerill-printing-really-big-is-awesome.html

Quote:

'Standing at a comfortable 4+ foot distance, the entire image looks fabulous. It is the pixel integrity: no artifacts, no aliasing, purirty of color right down the single pixel, which makes edges and textures look like the real thing.'

Not to be a snob, but this is not what I would call a huge print. The native file size of a file from the current imager is 26.13 x 17.42 inches at 180 dpi, which is the base resolution for an Epson printer. Assuming they want to use the best inkjet printer and print on a very good paper, uprezing by 2x in each direction will not cause the file to even breathe hard. (BTW, canvas is one of the best media to hide artifacts or, to put it another way, obscure detail. In any case, it is not a medium I would use to express the quality of the file.) By using canvas and maintaining a reasonable viewing distance, there is no real test of the quality with this "huge image."

The real challenge is the so-called gold standard of printing for a viewing distance of 1 inch. This is the standard Dominic and I were given back in 2004 and which we used for the years we printed for Sigma. To produce an "artifact-free" image at any dimension, we had to follow a strict set of steps and also use special actions Dominic created to handle artifacts. The cameras we were using at the time had far less information than the latest imagers.

What we discovered during this process is that one of the factors - a factor I do not fully understand, to be honest - is that the amount of information available at each pixel was far greater than in a CFA file for whatever reason, and that this was an important quality when uprezing. I often used the full-bucket-of-paint vs. one-quarter-full-bucket-of-paint analogy.

Our largest prints from the SD9 and SD10 were the same dimensions as this "huge print," and they were printed on a smooth matt paper. Plenty of people put their noses on them to confirm our meeting the standard.

The first prints I made from the SD1 exhibited similar rich information and detail. My first thought back then was that my Epson 9900 was too narrow. One of the first images I did was 42x63 inches, which is the largest my printer could do.

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Laurence
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