[R] png() does not generate a 24 bit PNG file
foylong at gmail.com
Wed Jul 30 12:37:37 CEST 2008
When I am using the png() function as the following to generate a png
file on Mac OSX Tiger, I found that the bit depth is 32. But I want a
24 bit depth png. What should I do?
To avoid using "cairo", and R-2.7.0 does not find a Xlib on my Mac, I
also tried this one:
> png(filename="/Users/usg/Desktop/new.png", type ="quartz" )
It does not work, either.
The manual says "png will 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)."
I don't want to set palette less than 256 colours, I just want a
24-bit png file.
Could anyone help me?
Thanks in advance.
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