diff --git a/Tools/iconsmooth.py b/Tools/iconsmooth.py
index 879b7c183c..ddc5578dc6 100644
--- a/Tools/iconsmooth.py
+++ b/Tools/iconsmooth.py
@@ -26,7 +26,10 @@ import sys
 import iconsmooth_lib
 
 if len(sys.argv) != 5:
-    raise Exception("iconsmooth.py <TEST.png> <TILESIZE> <" + iconsmooth_lib.all_conv + "> <OUTPREFIX>")
+    print("iconsmooth.py in.png METRICS <" + iconsmooth_lib.all_conv + "> OUTPREFIX")
+    print("OUTPREFIX is something like, say, " + iconsmooth_lib.explain_prefix)
+    print(iconsmooth_lib.explain_mm)
+    raise Exception("see printed help")
 
 # Input detail configuration
 input_name = sys.argv[1]
@@ -35,20 +38,7 @@ conversion_mode = sys.argv[3]
 out_prefix = sys.argv[4]
 
 # Metric configuration
-tile_w = int(metric_mode)
-tile_h = int(metric_mode)
-subtile_w = tile_w // 2
-subtile_h = tile_h // 2
-
-# Infer remainder from subtile
-# This is for uneven geometries
-#
-# SUB |
-# ----+----
-#     | REM
-#
-remtile_w = tile_w - subtile_w
-remtile_h = tile_h - subtile_h
+tile_w, tile_h, subtile_w, subtile_h, remtile_w, remtile_h = iconsmooth_lib.parse_metric_mode(metric_mode)
 
 # Output state configuration
 out_states = iconsmooth_lib.conversion_modes[conversion_mode].states
@@ -67,14 +57,14 @@ for i in range(48):
     tile.paste(src_img, (tx * -tile_w, ty * -tile_h))
     # now split that up
     # note that THIS is where the weird ordering gets put into place
-    tile_a = PIL.Image.new("RGBA", (remtile_w, remtile_w))
-    tile_a.paste(tile, (-subtile_w, -subtile_h))
+    tile_a = PIL.Image.new("RGBA", (remtile_w, remtile_h))
+    tile_a.paste(tile,           (-subtile_w, -subtile_h))
     tile_b = PIL.Image.new("RGBA", (subtile_w, subtile_h))
-    tile_b.paste(tile, (0, 0))
+    tile_b.paste(tile,           (         0,          0))
     tile_c = PIL.Image.new("RGBA", (remtile_w, subtile_h))
-    tile_c.paste(tile, (-subtile_w, 0))
-    tile_d = PIL.Image.new("RGBA", (subtile_w, remtile_w))
-    tile_d.paste(tile, (0, -subtile_h))
+    tile_c.paste(tile,           (-subtile_w,          0))
+    tile_d = PIL.Image.new("RGBA", (subtile_w, remtile_h))
+    tile_d.paste(tile,           (         0, -subtile_h))
     tiles.append([tile_a, tile_b, tile_c, tile_d])
 
 state_size = (tile_w * 2, tile_h * 2)
diff --git a/Tools/iconsmooth_inv.py b/Tools/iconsmooth_inv.py
index 5a40d01b66..64f9d2b20d 100644
--- a/Tools/iconsmooth_inv.py
+++ b/Tools/iconsmooth_inv.py
@@ -25,26 +25,24 @@ import PIL.Image
 import sys
 import iconsmooth_lib
 
-if len(sys.argv) != 4:
-    raise Exception("iconsmooth_rt2vxap.py INPREFIX (i.e. Resources/Textures/Structures/catwalk.rsi/catwalk_) <" + iconsmooth_lib.all_conv + "> out.png")
-
+if len(sys.argv) != 5:
+    print("iconsmooth_inv.py INPREFIX METRICS <" + iconsmooth_lib.all_conv + "> out.png")
+    print("INPREFIX is something like, say, " + iconsmooth_lib.explain_prefix)
+    print(iconsmooth_lib.explain_mm)
+    raise Exception("see printed help")
 # Input detail configuration
 input_prefix = sys.argv[1]
-conversion_mode = iconsmooth_lib.conversion_modes[sys.argv[2]]
-output_name = sys.argv[3]
+metric_mode = sys.argv[2]
+conversion_mode = iconsmooth_lib.conversion_modes[sys.argv[3]]
+output_name = sys.argv[4]
+
+tile_w, tile_h, subtile_w, subtile_h, remtile_w, remtile_h = iconsmooth_lib.parse_metric_mode(metric_mode)
 
 # Source loading
 tiles = []
 
 for j in range(8):
     src_img = PIL.Image.open(input_prefix + str(j) + ".png")
-    # Infer
-    tile_w = src_img.size[0] // 2
-    tile_h = src_img.size[1] // 2
-    subtile_w = tile_w // 2
-    subtile_h = tile_h // 2
-    remtile_w = tile_w - subtile_w
-    remtile_h = tile_h - subtile_h
 
     tile_a = PIL.Image.new("RGBA", (remtile_w, remtile_h))
     tile_a.paste(src_img, (-subtile_w, -subtile_h))
diff --git a/Tools/iconsmooth_lib.py b/Tools/iconsmooth_lib.py
index 3e60154476..60e0fd720e 100644
--- a/Tools/iconsmooth_lib.py
+++ b/Tools/iconsmooth_lib.py
@@ -115,3 +115,53 @@ conversion_modes = {
 
 all_conv = "tg/citadel/vxa/vxap/rt_states"
 
+def parse_size(sz):
+    if sz.find("x") == -1:
+        szi = int(sz)
+        return szi, szi
+    sp = sz.split("x")
+    return int(sp[0]), int(sp[1])
+
+def parse_metric_mode_base(mm):
+    if mm.find(".") == -1:
+        # infer point as being in the centre
+        tile_w, tile_h = parse_size(mm)
+        return tile_w, tile_h, tile_w // 2, tile_h // 2
+    sp = mm.split(".")
+    tile_w, tile_h = parse_size(sp[0])
+    subtile_w, subtile_h = parse_size(sp[1])
+    return tile_w, tile_h, subtile_w, subtile_h
+
+def parse_metric_mode(mm):
+    tile_w, tile_h, subtile_w, subtile_h = parse_metric_mode_base(mm)
+
+    # Infer remainder from subtile
+    # This is for uneven geometries
+    #
+    # SUB |
+    # ----+----
+    #     | REM
+    #
+    remtile_w = tile_w - subtile_w
+    remtile_h = tile_h - subtile_h
+    return tile_w, tile_h, subtile_w, subtile_h, remtile_w, remtile_h
+
+explain_mm = """
+- Metrics -
+METRICS is of one of the following forms:
+ TILESIZE
+ TILEWxTILEH
+ TILESIZE.SUBTILEWxSUBTILEH
+
+These metrics define the tile's size and divide it up as so:
+
+SUB |
+----+----
+    | REM
+
+SUB is either specified as the subtile width/height, or defaults to being half of the tile size.
+REM is computed from subtracting the subtile size from the tile size.
+"""
+
+explain_prefix = "Resources/Textures/Structures/catwalk.rsi/catwalk_"
+