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Dear R-users, I wonder whether it is possible to speed up plots of 2-dimensional images (such as image() or levelplot()) in order to export lower quality versions of the resulting plots. I intend to export a large number of images in order to construct animated gifs. For this purpose, I used the png()-function in conncection with image() and levelplot(). But the underlying arrays are so big

You may want to look into using the log option to qnorm e.g., in round figures: > log(1e-300) [1] -690.7755 > qnorm(-691, log=TRUE) [1] -37.05315 > exp(37^2/2) [1] 1.881797e+297 > exp(-37^2/2) [1] 5.314068e-298 Notice that floating point representation cuts out at 1e+/-308 or so. If you want to go outside that range, you may need explicit manipulation of the log values. qnorm()