feat(ColorMaps): Add inverted-grayscale sigmoid preset

Author: jadh4v

Sources/Rendering/Core/ColorTransferFunction/ColorMaps.json

@@ -605,10 +605,84 @@
    },
    {
       "ColorSpace" : "RGB",
-      "Name" : "Inverted Grayscale",
+      "Name" : "Inverted-Grayscale",
       "NanColor" : [ 1, 0, 0 ],
       "RGBPoints" : [ 0, 1, 1, 1, 1, 0, 0, 0 ]
    },
+   {
+      "ColorSpace" : "RGB",
+      "Name" : "Inverted-Grayscale-DICOM-sigmoid",
+      "Notes": "This is a 16 point sample of a sigmoid inverted-grayscale colormap described in the DICOM standard. See equation C.11-1 in section C.11.2",
+      "BelowRangeColor" : [ 1, 1, 1 ],
+      "AboveRangeColor" : [ 0, 0, 0 ],
+      "NanColor" : [ 1, 0, 0 ],
+      "RGBPoints" : [
+         -1,
+         0.9820137900379085,
+         0.9820137900379085,
+         0.9820137900379085,
+         -0.8666666666666667,
+         0.9697243080130495,
+         0.9697243080130495,
+         0.9697243080130495,
+         -0.7333333333333334,
+         0.9494698377645866,
+         0.9494698377645866,
+         0.9494698377645866,
+         -0.6,
+         0.9168273035060777,
+         0.9168273035060777,
+         0.9168273035060777,
+         -0.4666666666666667,
+         0.8660721116759263,
+         0.8660721116759263,
+         0.8660721116759263,
+         -0.33333333333333337,
+         0.791391472673955,
+         0.791391472673955,
+         0.791391472673955,
+         -0.19999999999999996,
+         0.6899744811276125,
+         0.6899744811276125,
+         0.6899744811276125,
+         -0.06666666666666665,
+         0.5662743941954391,
+         0.5662743941954391,
+         0.5662743941954391,
+         0.06666666666666665,
+         0.43372560580456077,
+         0.43372560580456077,
+         0.43372560580456077,
+         0.19999999999999996,
+         0.3100255188723875,
+         0.3100255188723875,
+         0.3100255188723875,
+         0.33333333333333326,
+         0.20860852732604496,
+         0.20860852732604496,
+         0.20860852732604496,
+         0.46666666666666656,
+         0.13392788832407365,
+         0.13392788832407365,
+         0.13392788832407365,
+         0.6000000000000001,
+         0.08317269649392234,
+         0.08317269649392234,
+         0.08317269649392234,
+         0.7333333333333334,
+         0.05053016223541351,
+         0.05053016223541351,
+         0.05053016223541351,
+         0.8666666666666667,
+         0.03027569198695046,
+         0.03027569198695046,
+         0.03027569198695046,
+         1,
+         0.01798620996209155,
+         0.01798620996209155,
+         0.01798620996209155
+      ]
+   },
    {
       "ColorSpace" : "RGB",
       "Name" : "BkRd",