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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