demo(ijroi) broken

[davidcsterratt]

demo("ijroi")


    demo(ijroi)
    ---- ~~~~~

Type  <Return>   to start : 

> path <- file.path(system.file(package = "RImageJROI"), "extdata", "ijroi")

> im <- as.raster(readPNG(file.path(path, "imagej-logo.png")))
Error in as.raster(readPNG(file.path(path, "imagej-logo.png"))) : 
  could not find function "readPNG"

[MikkoVihtakari]

This is because RImageJROI suggests, but does not import readPNG function from the png package. Add library(png) before as.raster and it should work. Alternatively we could use importFrom in the NAMESPACE.