# SVG to PNG

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Here is a way to get a high-quality PNG image with R: save it as SVG
first, then convert the SVG file to a PNG file, with the
**rsvg** package.

Let’s see. I construct a hyperbolic Delaunay triangulation with the
**gyro** package:

library(gyro) phi <- (1 + sqrt(5)) / 2 theta <- head(seq(0, pi/2, length.out = 11), -1L) a <- phi^((2*theta/pi)^0.8 - 1) u <- a * cos(theta) v <- a * sin(theta) x <- c(0, u, -v, -u, v) y <- c(0, v, u, -v, -u) pts <- cbind(x, y) / 1.07 hdel <- hdelaunay(pts, model = "U") fcolor <- function(t){ RGB <- colorRamp(hcl.colors(20L, "Berlin"))(t) rgb(RGB[, 1L], RGB[, 2L], RGB[, 3L], maxColorValue = 255) }

Now let’s save the plot as a PNG, directly:

png("hdelaunayU.png", width = 512, height = 512) plotHdelaunay( hdel, vertices = FALSE, color = fcolor ) dev.off()

And now let’s save it as SVG then convert it to PNG:

svg("hdelaunayU.svg") plotHdelaunay( hdel, vertices = FALSE, color = fcolor ) dev.off() rsvg::rsvg_png( "hdelaunayU.svg", "hdelaunayU_from_svg.png", width = 512, height = 512 )

Observe the difference:

To

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