diff --git a/hdr/crt-sony-pvm-2730-4k-hdr.slangp b/hdr/crt-sony-pvm-2730-4k-hdr.slangp
index 7f41875..bb0fb96 100644
--- a/hdr/crt-sony-pvm-2730-4k-hdr.slangp
+++ b/hdr/crt-sony-pvm-2730-4k-hdr.slangp
@@ -1,5 +1,5 @@
 #reference "crt-sony-pvm-4k-hdr.slangp"
-Contrast = "4.500000"
+Contrast = "3.7500000"
 PaperWhiteNits = "450.000000"
 ScanlineWidth = "0.950000"
 ResolutionPattern = "2.000000"
diff --git a/hdr/shaders/hdr10.slang b/hdr/shaders/hdr10.slang
index e616728..05a0d94 100644
--- a/hdr/shaders/hdr10.slang
+++ b/hdr/shaders/hdr10.slang
@@ -20,7 +20,7 @@ layout(push_constant) uniform Push
    float ExpandGamut;
 } params;
 
-#pragma parameter PaperWhiteNits    "Paper White Luminance"    400.0    0.0 10000.0 10.0
+#pragma parameter PaperWhiteNits    "Paper White Luminance"    450.0    0.0 10000.0 10.0
 #pragma parameter ExpandGamut       "ExpandGamut"              1.0      0.0 1.0     1.0
 
 layout(std140, set = 0, binding = 0) uniform UBO
diff --git a/hdr/shaders/inverse_tonemap.slang b/hdr/shaders/inverse_tonemap.slang
index 86b6852..e75af84 100644
--- a/hdr/shaders/inverse_tonemap.slang
+++ b/hdr/shaders/inverse_tonemap.slang
@@ -21,8 +21,8 @@ layout(push_constant) uniform Push
    float MaxNits;
 } params;
 
-#pragma parameter Contrast          "Contrast"              5.0      0.0 10.0    0.01
-#pragma parameter PaperWhiteNits    "Paper White Luminance" 400.0    0.0 10000.0 10.0
+#pragma parameter Contrast          "Contrast"              3.75     0.0 10.0    0.01
+#pragma parameter PaperWhiteNits    "Paper White Luminance" 450.0    0.0 10000.0 10.0
 #pragma parameter MaxNits           "Peak Luminance"        700.0    0.0 10000.0 10.0
 
 layout(std140, set = 0, binding = 0) uniform UBO