In message <1423073274.25516.59.ca...@obry.net> on Wed, 04 Feb 2015 19:07:54 
+0100, Pascal Obry <pas...@obry.net> said:

pascal> Ah indeed, darktable will never ever scale up an image. There is no
pascal> point except getting a bad quality print. 
pascal> 
pascal> > With my own photos, at native camera's resolution, printing size is 
correct.
pascal> 
pascal> Right, expected. The image must at least have the resolution of the
pascal> printed size given the native printer DPI (300 or 360).

You know, there are all kinds of ways you could have expressed that
without going for a wholier-than-thou kind of position.

What defines a quality print isn't just so much the DPI as it is the
content of the image and how that renders at different sizes.  I agree
that for some images, you're entirely right (an example, I tried
upscaling a picture I had for an exhibit and it looked horrible, so I
stayed with the smaller size), while there are others where upscaling
doesn't take away from the picture (there's another picture I have
that I upscaled with photoshop to be printed on a huge printer, just
for kicks, and it came out surprisingly good!).

Furthermore, have you taken a close look at some pictures that are
exhibited out there?  I went looking at pretty big prints of David
Lachapelle some time last year, and amused myself with basically pixel
peeping those prints.  And sure, when you're close to the picture,
even the plane of focus is blurry...  but you don't really look at a
picture at such a close distance, do you?  You take a couple of steps
back to take in the whole picture, don't you?  What does the picture
look like to you then?

So please, I can perfectly understand not upscaling now or ever from a
purely programmatic point of view.  Maybe you'd rather leave that to
some other software for all I know, because it already does this
perfectly well?  But as for judging the quality of a picture, PLEASE
leave that to each photographer and his/her intent.  It's really not
your job or priviledge to pass judgement on pictures or prints thereof
when you haven't even seen them.

Seriously.

-- 
Richard Levitte                         rich...@levitte.org
                                        http://richard.levitte.org/

"Life is a tremendous celebration - and I'm invited!"
-- from a friend's blog, translated from Swedish

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