3 options I think.
1:
http://docs.qgis.org/2.6/en/docs/user_manual/introduction/getting_started.html#command-line-options.
This will permit you to set the resolution.
2: you can save the image using the map printing utility.
3: I think you can save a raster as an image file somewhere. Maybe under
raster or something.... Can't remember were exactly....
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
Le 2015-02-13 15:37, "Gabriel Lema [via OSGeo.org]"
<[email protected]> a écrit :
Hello,
I was wondering what QGIS does to display 16 bit per channel RGB
images. I would like to covert them to 8 bit per channel normal PNG or
JPG image, but when I save it using the "Save as..." in the
"Project"
menu, I get a low resolution image.
If I could have access to the conversion from 16 bit to 8 bit that
QGIS does, which makes a good looking RGB image, I could do that same
conversion on any other software, and save it full resolution. Is it a
gamma correction? I've tried many different, but haven't been
successful so far.
If I save it using gdal_translate I get a greenish looking image, that
is very different from the good looking image that QGIS displays.
Thank you for your help.
Gabriel
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