Hi Wolfgang, thanks for this - I took a look the EBImage webpage [http://www.ebi.ac.uk/~osklyar/projects/EBImage/] and it looks very nice. Are there any plans for Windows support too? I am looking for a cross-platform solution.
Cheers Henrik On 7/21/06, Wolfgang Huber <[EMAIL PROTECTED]> wrote: > > Hi Henrik, > this does not directly answer your question, but you might be able to > use the function write.image in the package EBImage (Bioconductor) to > write matrices into image files (e.g. PNG or JPEG), this might be more > flexible and also faster than what you're trying to do. > Best wishes > Wolfgang > ------------------------------------------------------------------ > Wolfgang Huber EBI/EMBL Cambridge UK http://www.ebi.ac.uk/huber > > Henrik Bengtsson wrote: > > Hi, > > > > I try to create PNG images of a certain size where each pixel > > intensity corresponds to exactly one probe signal in an Affymetrix > > array. I try to use png() and image() with zero margins to do this. > > Example: > > > > z <- matrix(1:15, nrow=45, ncol=30) > > png("large.png", height=nrow(z), width=ncol(z), bg="red") > > par(mar=c(0,0,0,0)) > > image(z, col=gray.colors(16), axes=FALSE) > > dev.off() > > > > z <- matrix(1:15, nrow=5, ncol=3) > > png("tiny.png", height=nrow(z), width=ncol(z), bg="red") > > par(mar=c(0,0,0,0)) > > image(z, col=gray.colors(16), axes=FALSE) > > dev.off() > > > > The problem is that on WinXP the very bottom row and the very right > > column of pixels in red. Trying on Linux, it is only the very right > > column that is red. See attached images (you might have to zoom in to > > see it). I try to do this in R v2.3.1. The same effect is seen if > > the jpeg() device is used. > > > > When rescaling, the same effect is seen (the red border effect is one > > pixel wide), e.g. > > > > z <- matrix(1:15, nrow=45, ncol=30) > > png("large5.png", height=5*nrow(z), width=5*ncol(z), bg="red") > > par(mar=c(0,0,0,0)) > > image(z, col=gray.colors(16), axes=FALSE) > > dev.off() > > > > I might be asking for something that is not supported, but is there a > > way around this? It is a problem, because I wish to tile the images > > in an HTML page. > > > > Thanks > > > > Henrik > > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
