On 10/10/2012 07:23, Anshul Gupta wrote:
Hi,
I am a developer from Oracle. I wanted to create a png file out of
png
device with a bit depth of 8. I am using R on linux. But I noticed that
R automatically switches between 8 and 24 bit depth. i tried a lot of
things from your grDevices package but unable to control the bitdepth. I
would be really grateful to you guys if you can suggest me some way to
solve this issue.
Let me read the help page to you ...
‘png’ will normally use a palette if there are less than 256
colours on the page, and record a 24-bit RGB file otherwise (or a
32-bit RGBA file if ‘type = "cairo"’ and non-opaque colours are
used). ...
So, it is obvious that you need to use less than 256 colours (which is
all PNG8 can support: it is not a 'bit depth' as it uses a palette).
-/Ag
Anshul Gupta
Mobile : +91-814773074
Linkedin : http://in.linkedin.com/pub/anshul-gupta/19/b36/4a7
Personal Website : http://www.guptaanshul.com
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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