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My goal is to download an image from an URL and then display it in R.
I got an URL and figured out how to download it. But the downloaded file can't be previewed because it is 'damaged, corrupted, or is too big'.
y = "http://upload.wikimedia.org/wikipedia/commons/5/5d/AaronEckhart10TIFF.jpg"
download.file(y, 'y.jpg')
I also tried
image('y.jpg')
in R, but the error message shows like:
Error in image.default("y.jpg") : argument must be matrix-like
Any suggestions?
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Click on the Download Image from URL button, the field will appear on the right. Enter the full web address of the image. Click on the arrow to the right of the field and select the Force Check checkbox. Then click the Save button.
If you're running R through Rstudio, then the easiest way to save your image is to click on the “Export” button in the Plot panel (i.e., the area in Rstudio where all the plots have been appearing). When you do that you'll see a menu that contains the options “Save Plot as PDF” and “Save Plot as Image”.
file gives the full path for a file that ships with a R package #if you already have the full path to the file you want to load just run: #im <- load. image("/somedirectory/myfile. png") im <- load.
If I try your code it looks like the image is downloaded. However, when opened with windows image viewer it also says it is corrupt.
The reason for this is that you don't have specified the mode in the download.file statement.
Try this:
download.file(y,'y.jpg', mode = 'wb')
For more info about the mode is see ?download.file
This way at least the file that you downloaded is working.
To view the image in R, have a look at
jj <- readJPEG("y.jpg",native=TRUE)
plot(0:1,0:1,type="n",ann=FALSE,axes=FALSE)
rasterImage(jj,0,0,1,1)
or how to read.jpeg in R 2.15 or Displaying images in R in version 3.1.0
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