diff --git a/Gems/Atom/Feature/Common/Code/Source/ReflectionScreenSpace/ReflectionScreenSpaceBlurChildPass.cpp b/Gems/Atom/Feature/Common/Code/Source/ReflectionScreenSpace/ReflectionScreenSpaceBlurChildPass.cpp
index 2d4b6ee85f..690a2d63c2 100644
--- a/Gems/Atom/Feature/Common/Code/Source/ReflectionScreenSpace/ReflectionScreenSpaceBlurChildPass.cpp
+++ b/Gems/Atom/Feature/Common/Code/Source/ReflectionScreenSpace/ReflectionScreenSpaceBlurChildPass.cpp
@@ -47,8 +47,12 @@ namespace AZ
                 m_updateSrg = true;
             }
 
-            params.m_viewportState = RHI::Viewport(0, static_cast<float>(m_imageSize.m_width), 0, static_cast<float>(m_imageSize.m_height));
-            params.m_scissorState = RHI::Scissor(0, 0, m_imageSize.m_width, m_imageSize.m_height);
+            float inverseScale = 1.0f / m_outputScale;
+            uint32_t outputWidth = m_imageSize.m_width * inverseScale;
+            uint32_t outputHeight = m_imageSize.m_height * inverseScale;
+
+            params.m_viewportState = RHI::Viewport(0, static_cast<float>(outputWidth), 0, static_cast<float>(outputHeight));
+            params.m_scissorState = RHI::Scissor(0, 0, outputWidth, outputHeight);
 
             FullscreenTrianglePass::FrameBeginInternal(params);
         }
diff --git a/Gems/Atom/RPI/Code/Source/RPI.Public/Pass/FullscreenTrianglePass.cpp b/Gems/Atom/RPI/Code/Source/RPI.Public/Pass/FullscreenTrianglePass.cpp
index 67a6fcaa5b..5c76b084b1 100644
--- a/Gems/Atom/RPI/Code/Source/RPI.Public/Pass/FullscreenTrianglePass.cpp
+++ b/Gems/Atom/RPI/Code/Source/RPI.Public/Pass/FullscreenTrianglePass.cpp
@@ -24,6 +24,7 @@
 
 #include <AzCore/Asset/AssetCommon.h>
 #include <AzCore/Asset/AssetManagerBus.h>
+#include <AzCore/std/algorithm.h>
 
 namespace AZ
 {
@@ -181,19 +182,15 @@ namespace AZ
 
             RHI::Size targetImageSize = outputAttachment->m_descriptor.m_image.m_size;
 
-            m_viewportState = params.m_viewportState;
-            if (m_viewportState.IsNull())
-            {
-                // compute viewport from target attachment
-                m_viewportState = RHI::Viewport(0, static_cast<float>(targetImageSize.m_width), 0, static_cast<float>(targetImageSize.m_height));
-            }
+            m_viewportState.m_minX = 0.0f;
+            m_viewportState.m_minY = 0.0f;
+            m_viewportState.m_maxX = AZStd::min(static_cast<uint32_t>(params.m_viewportState.m_maxX), targetImageSize.m_width);
+            m_viewportState.m_maxY = AZStd::min(static_cast<uint32_t>(params.m_viewportState.m_maxY), targetImageSize.m_height);
 
-            m_scissorState = params.m_scissorState;
-            if (m_scissorState.IsNull())
-            {
-                // compute scissor from target attachment
-                m_scissorState = RHI::Scissor(0, 0, targetImageSize.m_width, targetImageSize.m_height);
-            }
+            m_scissorState.m_minX = 0.0f;
+            m_scissorState.m_minY = 0.0f;
+            m_scissorState.m_maxX = AZStd::min(static_cast<uint32_t>(params.m_scissorState.m_maxX), targetImageSize.m_width);
+            m_scissorState.m_maxY = AZStd::min(static_cast<uint32_t>(params.m_scissorState.m_maxY), targetImageSize.m_height);
 
             RenderPass::FrameBeginInternal(params);
         }