Abelian-2 wrote: > > Dear all > when i draw some figures by R, i try to use "jpeg" to display my > result. > However, it isn't still clear as i want. > Especially when i compare the origial figures by R and the ".jpeg" > file >
JPEG is designed for photos (the "P" stands for "Photographic"). The compression method is good for images with smooth color variation. (In fact, the method is "lossy" -- it loses some of the original pixels, but in a photo, your eye can't detect the difference) On a line drawing, that same loss of information is readily apparent; the edges of text look "fuzzy." Try PNG instead. Its compression method is designed to be very efficient with line art, and it doesn't lose any information. It will give a much more crisp image that usually takes up less disk space. A sample plot( ) that I did, saved both ways, gave a .jpg file of size 11014 bytes with a "fuzzy" look. The .png file was only 1957 bytes, and the lines and text had sharp edges. Try this: png(filename="something.png",width=600,height=400, pointsize=14) plot(x,y) dev.off() -- View this message in context: http://www.nabble.com/how-to-make-the-figure-more-clearly-tp22094071p22095089.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
