diff --git a/exe/mikunyan-image b/exe/mikunyan-image
new file mode 100755
index 0000000..97df628
--- /dev/null
+++ b/exe/mikunyan-image
@@ -0,0 +1,55 @@
+#!/usr/bin/env ruby
+require 'mikunyan'
+require 'mikunyan/decoders'
+require 'fileutils'
+
+opts = {:as_asset => false, :outputdir => nil}
+arg = nil
+i = 0
+while i < ARGV.count
+    if ARGV[i].start_with?('-')
+        case ARGV[i]
+        when '--as-asset', '-a'
+            opts[:as_asset] = true
+        when '--outputdir', '-o'
+            i += 1
+            opts[:outputdir] = ARGV[i]
+        else
+            warn("Unknown option: #{ARGV[i]}")
+        end
+    else
+        arg = ARGV[i] unless arg
+    end
+    i += 1
+end
+
+unless arg
+    warn("Input file is not specified")
+    exit(1)
+end
+
+unless File.file?(arg)
+    warn("File not found: #{arg}")
+    exit(1)
+end
+
+assets = []
+
+if opts[:as_asset]
+    assets = [Mikunyan::Asset.file(arg, File.basename(arg, '.*'))]
+else
+    assets = Mikunyan::AssetBundle.file(arg).assets
+end
+
+outdir = opts[:outputdir] || File.basename(arg, '.*')
+FileUtils.mkpath(outdir)
+
+assets.each do |asset|
+    asset.path_ids.select{|path_id| asset.object_type(path_id) == 'Texture2D'}.each do |path_id|
+        obj = asset.parse_object(path_id)
+        name = obj.m_Name.value
+        image = Mikunyan::ImageDecoder.decode_object(obj)
+        puts "#{outdir}/#{name}.png (#{image.width} x #{image.height})"
+        image.save("#{outdir}/#{name}.png") if image
+    end
+end