BatchConvertImages.scala

val d = file("/media/hhrutz/MnemoN/BackupEzra091201/Users/rutz/Documents/Pictures/Scans/Ryoanji2009-04-04/")

def toMonoPNG(in: File, inExt: String = "tif"): Unit = {
  val inFiles = in.children.filter(_.ext.toLowerCase == inExt).sortBy(_.name)
  println("#!/bin/bash\n")
  inFiles.foreach { inF =>
    val outF = inF.replaceExt("png")
    val cmd  = s"convert -threshold 50% '$inF' '$outF'"
    println(cmd)
  }
}

toMonoPNG(d)

////////////////////////////////

val dIn  = file("/home/hhrutz/Documents/projects/Eisenerz/photos/160612")
val dOut = dIn / "web_scale"

def resize50(in: File, out: File, inExt: String = "jpg"): Unit = {
  val inFiles = in.children.filter(_.ext.toLowerCase == inExt).sortBy(_.name)
  println("#!/bin/bash\n")
  inFiles.foreach { inF =>
    val outF = out / s"${inF.base}m.jpg"
    require (!outF.exists())
    val cmd  = s"convert -resize 50% '$inF' '$outF'"
    println(cmd)
  }
}

resize50(dIn, dOut)