Is it me or do my plots look low quality?

[jyr...@gmail.com]

Hi everyone, I'm new to R and ggplot2 so I'm not 100% sure what to expect but I certainly feel like something is off. Can someone confirm if what I'm seeing is unusual and if so, what I can do about it?

This is the first plot:

ggplot(diamonds, aes(carat,price)) + geom_point() + geom_smooth()

Look at that blue line - is it supposed to be that pixely and jagged?

This second one is:

ggplot(diamonds, aes(carat,price)) + stat_binhex(bins = 10)

Firstly, the little lines between the bins are missing but also look at the edges, again, very jagged.

I can add colour="gray" to it but the lines will remain jagged.

And another example(this one is a pain to replicate, sorry, but the point remains) is the fourth chart down from this turorial: http://thedatagame.com.au/2015/09/27/how-to-create-nba-shot-charts-in-r/

Mine looks like this: 

Are the little circles round and smooth "enough" there?

I'm using the latest version of R and ggplot2 on Windows 10. Anyone have any ideas?

Cheers,

Mart

[Brandon Hurr]

I'm on mac so I'm not sure so much with Windows, but when I get this sometimes on quartz() I increase the dpi argument and it goes away. 

Looks like this page might be helpful. 

http://gforge.se/2013/02/exporting-nice-plots-in-r/#update

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[Konstantinos L. Papageorgiou]

nice plots..
you could export the images with a higher resolution (width x height)
a relevant resource about antializing http://www.r-bloggers.com/exporting-nice-plots-in-r/
you could also export the images in pdf and apply further processing in other programs like illustrator, photoshop

[jyr...@gmail.com]

Thanks guys, anti-aliasing in png exports did seem to be the key problem here. Looks like I have a lot to learn. For now exporting as pdf and going from there fixes the issue.

[David Ruvolo]

ggsave is another option. See http://docs.ggplot2.org/0.9.2.1/ggsave.html for further details.

For example:

# plot carat and price
myplot <- ggplot(data = diamonds, aes(x = carat, y = price)) +

    geom_point() +

    geom_smooth()

# save plot

ggsave(myplot, file = "myplot.png", dpi = 700) # adjust dpi accordingly

[Thiago V. dos Santos]

I hope this is not a late reply, but my workflow to save optimal pictures from within R is the following:

1) copy the figure straight from the graphic device to a pdf file, using "dev.copy2pdf": dev.copy2pdf("image.pdf", width=8.5, height=11)

2) use imagemagick to convert the pdf into a high-res png, using this command: convert -density 600 image.pdf image.png

3) optional - also with imagemagick, remove all the white borders and leave only the contents that matter: convert image.png -trim image_trimmed.png

 

Hope this helps,

 -- Thiago V. dos Santos

PhD student

Land and Atmospheric Science

University of Minnesota