diff --git a/doc/config.yml.sample b/doc/config.yml.sample
index 8b90a7ee8..f56c0fc94 100644
--- a/doc/config.yml.sample
+++ b/doc/config.yml.sample
@@ -296,4 +296,8 @@ secnolevel: 2
   # 渡される引数1=作業用展開ディレクトリ、引数2=呼び出しを実行したディレクトリ
   # hook_afterdvipdf: null
   #
+  # 画像のscale=X.Xという指定を画像拡大縮小率からページ最大幅の相対倍率に変換します。
+  # image_scale2width: true
+  #
   # pdfmaker:階層を使うものはここまで
+
diff --git a/lib/review/configure.rb b/lib/review/configure.rb
index 3d0890521..acefb9dd0 100644
--- a/lib/review/configure.rb
+++ b/lib/review/configure.rb
@@ -50,6 +50,7 @@ def self.values
         "ext" => '.re',
         "image_dir" => 'images',
         "image_types" => %w( .ai .psd .eps .pdf .tif .tiff .png .bmp .jpg .jpeg .gif .svg ),
+        "image_scale2width" => true, # for LaTeX
         "bib_file" => "bib.re",
         "colophon_order" => %w(aut csl trl dsr ill cov edt pbl contact prt),
         "externallink" => true,
diff --git a/lib/review/latexbuilder.rb b/lib/review/latexbuilder.rb
index a1fd7026c..a94881ccd 100644
--- a/lib/review/latexbuilder.rb
+++ b/lib/review/latexbuilder.rb
@@ -345,6 +345,13 @@ def source(lines, caption, lang = nil)
     def image_header(id, caption)
     end
 
+    def handle_metric(str)
+      if @book.config["image_scale2width"] && str =~ /\Ascale=([\d.]+)\Z/
+        return "width=#{$1}\\maxwidth"
+      end
+      str
+    end
+
     def result_metric(array)
       "#{array.join(',')}"
     end
diff --git a/test/test_latexbuilder.rb b/test/test_latexbuilder.rb
index e8e46cb28..9d294b2c7 100644
--- a/test/test_latexbuilder.rb
+++ b/test/test_latexbuilder.rb
@@ -15,6 +15,7 @@ def setup
       "secnolevel" => 2, # for IDGXMLBuilder, EPUBBuilder
       "toclevel" => 2,
       "stylesheet" => nil, # for EPUBBuilder
+      "image_scale2width" => false,
       "texcommand" => "uplatex"
     })
     @book = Book::Base.new(nil)
@@ -364,6 +365,18 @@ def @chapter.image(id)
     assert_equal %Q|\\begin{reviewimage}\n\\includegraphics[scale=1.2]{./images/chap1-sampleimg.png}\n\\caption{sample photo}\n\\label{image:chap1:sampleimg}\n\\end{reviewimage}\n|, actual
   end
 
+  def test_image_with_metric_width
+    def @chapter.image(id)
+      item = Book::ImageIndex::Item.new("sampleimg",1)
+      item.instance_eval{@path="./images/chap1-sampleimg.png"}
+      item
+    end
+
+    @config["image_scale2width"] = true
+    actual = compile_block("//image[sampleimg][sample photo][scale=1.2]{\n//}\n")
+    assert_equal %Q|\\begin{reviewimage}\n\\includegraphics[width=1.2\\maxwidth]{./images/chap1-sampleimg.png}\n\\caption{sample photo}\n\\label{image:chap1:sampleimg}\n\\end{reviewimage}\n|, actual
+  end
+
   def test_image_with_metric2
     def @chapter.image(id)
       item = Book::ImageIndex::Item.new("sampleimg",1)
@@ -375,6 +388,18 @@ def @chapter.image(id)
     assert_equal %Q|\\begin{reviewimage}\n\\includegraphics[scale=1.2,ignore=params]{./images/chap1-sampleimg.png}\n\\caption{sample photo}\n\\label{image:chap1:sampleimg}\n\\end{reviewimage}\n|, actual
   end
 
+  def test_image_with_metric2_width
+    def @chapter.image(id)
+      item = Book::ImageIndex::Item.new("sampleimg",1)
+      item.instance_eval{@path="./images/chap1-sampleimg.png"}
+      item
+    end
+
+    @config["image_scale2width"] = true
+    actual = compile_block("//image[sampleimg][sample photo][scale=1.2,html::class=sample,latex::ignore=params]{\n//}\n")
+    assert_equal %Q|\\begin{reviewimage}\n\\includegraphics[width=1.2\\maxwidth,ignore=params]{./images/chap1-sampleimg.png}\n\\caption{sample photo}\n\\label{image:chap1:sampleimg}\n\\end{reviewimage}\n|, actual
+  end
+
   def test_indepimage
     def @chapter.image(id)
       item = Book::ImageIndex::Item.new("sampleimg",1)
@@ -409,6 +434,18 @@ def @chapter.image(id)
     assert_equal %Q|\\begin{reviewimage}\n\\includegraphics[scale=1.2]{./images/chap1-sampleimg.png}\n\\reviewindepimagecaption{図: sample photo}\n\\end{reviewimage}\n|, actual
   end
 
+  def test_indepimage_with_metric_width
+    def @chapter.image(id)
+      item = Book::ImageIndex::Item.new("sampleimg",1)
+      item.instance_eval{@path="./images/chap1-sampleimg.png"}
+      item
+    end
+
+    @config["image_scale2width"] = true
+    actual = compile_block("//indepimage[sampleimg][sample photo][scale=1.2]\n")
+    assert_equal %Q|\\begin{reviewimage}\n\\includegraphics[width=1.2\\maxwidth]{./images/chap1-sampleimg.png}\n\\reviewindepimagecaption{図: sample photo}\n\\end{reviewimage}\n|, actual
+  end
+
   def test_indepimage_with_metric2
     def @chapter.image(id)
       item = Book::ImageIndex::Item.new("sampleimg",1)