Convert plot into pixels in R











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Does anyone know how to convert a simple plot into png_format without saving the picture...? In other words, I look for the most straight forward and fastest way to convert a simple plot into pixels, if it is not already (see code below)...




EDIT: Suggestion given by @hrbrmstr implemented...




## SolutionOne



library(png)

testONE <- system.time({

  ## Save plot as .png

  tmp <- tempfile()

  png(tmp, width = 800, height = 600, res = 72)

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  dev.off()

  ## Read .png

  asPixels <- readPNG(tmp)

  ## Information needed (e.g. RGB)

  dim(asPixels)

  pixONE <- asPixels[300, 400, 1:3]

})



## SolutionTwo



library(magick)

testTWO <- system.time({

  ## Produce image using graphics device

  fig <- image_graph()

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  ## Information needed

  pixTWO <- image_data(fig)[1:3, 400, 300]

  dev.off()

})



testONE # elapsed time: 0.064

testTWO # elapsed time: 0.164


Thanks for any hint...






r png rendering rgb getpixel







share|improve this question




















  • 1




    you can use the graphics devices provided by the magick package.
    – hrbrmstr
    Nov 7 at 13:18










  • Looks promising - let me try...
    – Robert
    Nov 7 at 13:27










  • Given that I did everything right in using the magick package, time elapsed for extracting the information needed is not reduced (see above)...
    – Robert
    Nov 7 at 15:13






  • 1




    FYI I tested with file="clipboard" and it's slower than both of your options.
    – Moody_Mudskipper
    Nov 7 at 16:05















up vote
4
down vote

favorite
1












Does anyone know how to convert a simple plot into png_format without saving the picture...? In other words, I look for the most straight forward and fastest way to convert a simple plot into pixels, if it is not already (see code below)...




EDIT: Suggestion given by @hrbrmstr implemented...




## SolutionOne



library(png)

testONE <- system.time({

  ## Save plot as .png

  tmp <- tempfile()

  png(tmp, width = 800, height = 600, res = 72)

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  dev.off()

  ## Read .png

  asPixels <- readPNG(tmp)

  ## Information needed (e.g. RGB)

  dim(asPixels)

  pixONE <- asPixels[300, 400, 1:3]

})



## SolutionTwo



library(magick)

testTWO <- system.time({

  ## Produce image using graphics device

  fig <- image_graph()

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  ## Information needed

  pixTWO <- image_data(fig)[1:3, 400, 300]

  dev.off()

})



testONE # elapsed time: 0.064

testTWO # elapsed time: 0.164


Thanks for any hint...






r png rendering rgb getpixel







share|improve this question




















  • 1




    you can use the graphics devices provided by the magick package.
    – hrbrmstr
    Nov 7 at 13:18










  • Looks promising - let me try...
    – Robert
    Nov 7 at 13:27










  • Given that I did everything right in using the magick package, time elapsed for extracting the information needed is not reduced (see above)...
    – Robert
    Nov 7 at 15:13






  • 1




    FYI I tested with file="clipboard" and it's slower than both of your options.
    – Moody_Mudskipper
    Nov 7 at 16:05













up vote
4
down vote

favorite
1









up vote
4
down vote

favorite
1






1





Does anyone know how to convert a simple plot into png_format without saving the picture...? In other words, I look for the most straight forward and fastest way to convert a simple plot into pixels, if it is not already (see code below)...




EDIT: Suggestion given by @hrbrmstr implemented...




## SolutionOne



library(png)

testONE <- system.time({

  ## Save plot as .png

  tmp <- tempfile()

  png(tmp, width = 800, height = 600, res = 72)

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  dev.off()

  ## Read .png

  asPixels <- readPNG(tmp)

  ## Information needed (e.g. RGB)

  dim(asPixels)

  pixONE <- asPixels[300, 400, 1:3]

})



## SolutionTwo



library(magick)

testTWO <- system.time({

  ## Produce image using graphics device

  fig <- image_graph()

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  ## Information needed

  pixTWO <- image_data(fig)[1:3, 400, 300]

  dev.off()

})



testONE # elapsed time: 0.064

testTWO # elapsed time: 0.164


Thanks for any hint...






r png rendering rgb getpixel







share|improve this question















Does anyone know how to convert a simple plot into png_format without saving the picture...? In other words, I look for the most straight forward and fastest way to convert a simple plot into pixels, if it is not already (see code below)...




EDIT: Suggestion given by @hrbrmstr implemented...




## SolutionOne



library(png)

testONE <- system.time({

  ## Save plot as .png

  tmp <- tempfile()

  png(tmp, width = 800, height = 600, res = 72)

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  dev.off()

  ## Read .png

  asPixels <- readPNG(tmp)

  ## Information needed (e.g. RGB)

  dim(asPixels)

  pixONE <- asPixels[300, 400, 1:3]

})



## SolutionTwo



library(magick)

testTWO <- system.time({

  ## Produce image using graphics device

  fig <- image_graph()

  plot(1:10, pch = 19, col = "yellowgreen", cex = 20)

  ## Information needed

  pixTWO <- image_data(fig)[1:3, 400, 300]

  dev.off()

})



testONE # elapsed time: 0.064

testTWO # elapsed time: 0.164


Thanks for any hint...






r png rendering rgb getpixel




r png rendering rgb getpixel






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 7 at 14:15

























asked Nov 7 at 12:47









Robert

688




688








  • 1




    you can use the graphics devices provided by the magick package.
    – hrbrmstr
    Nov 7 at 13:18










  • Looks promising - let me try...
    – Robert
    Nov 7 at 13:27










  • Given that I did everything right in using the magick package, time elapsed for extracting the information needed is not reduced (see above)...
    – Robert
    Nov 7 at 15:13






  • 1




    FYI I tested with file="clipboard" and it's slower than both of your options.
    – Moody_Mudskipper
    Nov 7 at 16:05














  • 1




    you can use the graphics devices provided by the magick package.
    – hrbrmstr
    Nov 7 at 13:18










  • Looks promising - let me try...
    – Robert
    Nov 7 at 13:27










  • Given that I did everything right in using the magick package, time elapsed for extracting the information needed is not reduced (see above)...
    – Robert
    Nov 7 at 15:13






  • 1




    FYI I tested with file="clipboard" and it's slower than both of your options.
    – Moody_Mudskipper
    Nov 7 at 16:05








1




1




you can use the graphics devices provided by the magick package.
– hrbrmstr
Nov 7 at 13:18




you can use the graphics devices provided by the magick package.
– hrbrmstr
Nov 7 at 13:18












Looks promising - let me try...
– Robert
Nov 7 at 13:27




Looks promising - let me try...
– Robert
Nov 7 at 13:27












Given that I did everything right in using the magick package, time elapsed for extracting the information needed is not reduced (see above)...
– Robert
Nov 7 at 15:13




Given that I did everything right in using the magick package, time elapsed for extracting the information needed is not reduced (see above)...
– Robert
Nov 7 at 15:13




1




1




FYI I tested with file="clipboard" and it's slower than both of your options.
– Moody_Mudskipper
Nov 7 at 16:05




FYI I tested with file="clipboard" and it's slower than both of your options.
– Moody_Mudskipper
Nov 7 at 16:05

















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