round corners for your png pics

roundpics.rb

#!/usr/bin/env ruby

# I haven't tested this lately but it did work at some point in time.

require 'rubygems'
require 'RMagick'
include Magick


Dir.new(".").entries.each do |src_name|
  if src_name.include?(".png") && ! src_name.include?("_r.png")
    source = Image.read(src_name).first
    #source.resize!(0.5)

    mask = Image.new(source.columns, source.rows) {self.background_color = 'black'}
    gc = Draw.new
    gc.stroke('white').fill('white')
    gc.roundrectangle(0, 0, source.columns-1, source.rows-1, 10, 10)
    gc.draw(mask)

    mask.matte = false
    source.matte = true

    destination = source.composite(mask, CenterGravity, CopyOpacityCompositeOp)
    dst_name = src_name.gsub(/.png$/, "").gsub(/ /, "_")
    destination.write("#{dst_name}_r.png") { self.quality = 100 }
  end
end