I believe you can do it this way: 

draw(PNG("hi_res.png", 1inch, 1inch, dpi=300), p)

See here for more:  https://github.com/dcjones/Compose.jl/pull/94

You might have to run the latest master of Gadfly.. not sure this is in a 
released version of Gadfly yet. 
Run Pkg.checkout("Gadfly") to get the latest master. Pkg.free("Gadfly") to set 
it back to the released version. 



On Wednesday, 28 January 2015 23:35:01 UTC, Li Zhang wrote:
>
> Hi fellows,
>
> I just encounter a scenario that i want to set the DPI of PNG output of 
> gadfly plot.
>
> There seems no direct way to control what i want
>
> ```
> draw(PNG(path, width, height))
> ```
>
> Any one have experience or way to do this?
>

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