Is it possible to make HUGE very good quality 40 inch prints from the Sony A900?

Started Jun 7, 2009 | Discussions thread
Robsphoto
OP Robsphoto Senior Member • Posts: 1,219
Upscaling digital camera images

Mark VB wrote:

Genuine Fractals is but one of many software applications used to
"upsize" an image by interpolation (i.e., creating pixels based on
information from surrounding pixels to increase the dimensions of an
image). Photoshop has a similar function using its image resize
function. You also can upsize an image in Camera RAW. There are
several others as well.

I have used the Photoshop Camera RAW resizing function to print
photos from a Maxxum 7D (6 MP resolution of about 2000x3000 pixels)
at 16x20 and 16x24 inches at 300 ppi (dpi). Doing the math, that
results in an image size of 4800 x 6000 or 7200 pixels, a 140%
increase in image size. These prints (done by mpix.com using an
optical printing process on "traditional" photographic paper) are
absolutely sharp and to my eye show no digital artifacts when viewed
close-up (much closer than one would normally view a print of that
size). If you wanted to print at 200 ppi (dpi), that would result in
a print size of 24 x 30 or 36 inches, from a 6 MP camera.

Applying a similar processes to an A700 or A900 file, you can easily
see how large a print you can do, depending on the print resolution
you want to use (e.g., 150 ppi, 200 ppi or 300 ppi). For example,
increasing an A700 file (native 2848 x 4272 pixels) by "just" 100%
results in pixel dimensions of 5696 x 8544, which can print to about
19 x 28.5 inches at 300 ppi, or 28.5 x 42.75 inches at 200 ppi.

An A900 file is 4032 x 6048 pixels, which interpolated up 100% would
give you a pixel dimension of 8064 x 12,096. This is suitable for
about a 27.8 x 40.3 inch print at 300 ppi, or a 40.3 x 60.5 inch
print at 200 ppi.

Note that these A700 and A900 examples are only 100% interpolations
(and done at print resolutions higher than the 150 ppi that the
original poster suggested), whereas my personal experiences using 6
MP Maxxum 7D images involved 140%. Yes, I have printed 16x20 images
from A700 and A900 files, which look beautiful, but that's not really
the point - I have not yet done any prints larger than 16x20 from
these sources, but I easily could (and may yet do so).

The bottom line is that a well shot A900 image (sharp and well
exposed) can easily be printed 40 inches wide, and in reality can be
printed much wider if you are so inclined.

Thanks Mark for this very helpful information. I have now included a link to your posting on my web page here:

http://www.robsphotography.co.nz/Determining-Print-Size-Of-Digital-Images.html

I also found this article to be helpful:

http://www.fixerlabs.com/EN/news/sizefixer2pp.pdf

It discusses some software packages that can be used to upscale images. I can understand that it may be possible to upscale an image by 100% with good quality results, but I didn't know that some software packages can achieve a 1000% usable enlargement !! This is certainly an incredible technical advance, has anyone upscaled images by 1000% with successful high quality results?

Regards
Rob
http://www.robsphotography.co.nz

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