diff --git a/src/common/rendering/gl/gl_framebuffer.cpp b/src/common/rendering/gl/gl_framebuffer.cpp
index a089699492..b116e95774 100644
--- a/src/common/rendering/gl/gl_framebuffer.cpp
+++ b/src/common/rendering/gl/gl_framebuffer.cpp
@@ -515,10 +515,10 @@ void OpenGLFrameBuffer::Draw2D()
 	}
 }
 
-void OpenGLFrameBuffer::PostProcessScene(bool swscene, int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D)
+void OpenGLFrameBuffer::PostProcessScene(bool swscene, int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D)
 {
 	if (!swscene) GLRenderer->mBuffers->BlitSceneToTexture(); // Copy the resulting scene to the current post process texture
-	GLRenderer->PostProcessScene(fixedcm, afterBloomDrawEndScene2D);
+	GLRenderer->PostProcessScene(fixedcm, flash, afterBloomDrawEndScene2D);
 }
 
 //==========================================================================
diff --git a/src/common/rendering/gl/gl_framebuffer.h b/src/common/rendering/gl/gl_framebuffer.h
index aaebbfeb3f..de10ac0524 100644
--- a/src/common/rendering/gl/gl_framebuffer.h
+++ b/src/common/rendering/gl/gl_framebuffer.h
@@ -61,7 +61,7 @@ public:
 	void SetVSync(bool vsync);
 
 	void Draw2D() override;
-	void PostProcessScene(bool swscene, int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D) override;
+	void PostProcessScene(bool swscene, int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D) override;
 
 	bool HWGammaActive = false;			// Are we using hardware or software gamma?
 	std::shared_ptr<FGLDebug> mDebug;	// Debug API
diff --git a/src/common/rendering/gl/gl_postprocess.cpp b/src/common/rendering/gl/gl_postprocess.cpp
index 2ac2db3136..4beed0577d 100644
--- a/src/common/rendering/gl/gl_postprocess.cpp
+++ b/src/common/rendering/gl/gl_postprocess.cpp
@@ -52,7 +52,7 @@ void FGLRenderer::RenderScreenQuad()
 	glDrawArrays(GL_TRIANGLE_STRIP, FFlatVertexBuffer::PRESENT_INDEX, 4);
 }
 
-void FGLRenderer::PostProcessScene(int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D)
+void FGLRenderer::PostProcessScene(int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D)
 {
 	int sceneWidth = mBuffers->GetSceneWidth();
 	int sceneHeight = mBuffers->GetSceneHeight();
@@ -62,7 +62,7 @@ void FGLRenderer::PostProcessScene(int fixedcm, const std::function<void()> &aft
 	hw_postprocess.Pass1(&renderstate, fixedcm, sceneWidth, sceneHeight);
 	mBuffers->BindCurrentFB();
 	if (afterBloomDrawEndScene2D) afterBloomDrawEndScene2D();
-	hw_postprocess.Pass2(&renderstate, fixedcm, sceneWidth, sceneHeight);
+	hw_postprocess.Pass2(&renderstate, fixedcm, flash, sceneWidth, sceneHeight);
 }
 
 //-----------------------------------------------------------------------------
diff --git a/src/common/rendering/gl/gl_renderer.h b/src/common/rendering/gl/gl_renderer.h
index 8b5fe7e038..c75927c0f5 100644
--- a/src/common/rendering/gl/gl_renderer.h
+++ b/src/common/rendering/gl/gl_renderer.h
@@ -72,7 +72,7 @@ public:
 
 	void PresentStereo();
 	void RenderScreenQuad();
-	void PostProcessScene(int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D);
+	void PostProcessScene(int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D);
 	void AmbientOccludeScene(float m5);
 	void ClearTonemapPalette();
 	void BlurScene(float gameinfobluramount);
diff --git a/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.cpp b/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
index 1dc670de0b..658a431dd2 100644
--- a/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
+++ b/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.cpp
@@ -532,20 +532,26 @@ void PPCameraExposure::UpdateTextures(int width, int height)
 
 /////////////////////////////////////////////////////////////////////////////
 
-void PPColormap::Render(PPRenderState *renderstate, int fixedcm)
+void PPColormap::Render(PPRenderState *renderstate, int fixedcm, float flash)
 {
+	ColormapUniforms uniforms;
+
 	if (fixedcm < CM_FIRSTSPECIALCOLORMAP || fixedcm >= CM_MAXCOLORMAP)
 	{
-		return;
+		if (flash == 1.f)
+			return;
+
+		uniforms.MapStart = { 0,0,0, flash };
+		uniforms.MapRange = { 0,0,0, 1.f };
 	}
+	else
+	{
+		FSpecialColormap* scm = &SpecialColormaps[fixedcm - CM_FIRSTSPECIALCOLORMAP];
 
-	FSpecialColormap *scm = &SpecialColormaps[fixedcm - CM_FIRSTSPECIALCOLORMAP];
-	float m[] = { scm->ColorizeEnd[0] - scm->ColorizeStart[0],
-		scm->ColorizeEnd[1] - scm->ColorizeStart[1], scm->ColorizeEnd[2] - scm->ColorizeStart[2], 0.f };
-
-	ColormapUniforms uniforms;
-	uniforms.MapStart = { scm->ColorizeStart[0], scm->ColorizeStart[1], scm->ColorizeStart[2], 0.f };
-	uniforms.MapRange = m;
+		uniforms.MapStart = { scm->ColorizeStart[0], scm->ColorizeStart[1], scm->ColorizeStart[2], flash };
+		uniforms.MapRange = { scm->ColorizeEnd[0] - scm->ColorizeStart[0],
+			scm->ColorizeEnd[1] - scm->ColorizeStart[1], scm->ColorizeEnd[2] - scm->ColorizeStart[2], 0.f };
+	}
 
 	renderstate->PushGroup("colormap");
 
@@ -1117,10 +1123,10 @@ void Postprocess::Pass1(PPRenderState* state, int fixedcm, int sceneWidth, int s
 	bloom.RenderBloom(state, sceneWidth, sceneHeight, fixedcm);
 }
 
-void Postprocess::Pass2(PPRenderState* state, int fixedcm, int sceneWidth, int sceneHeight)
+void Postprocess::Pass2(PPRenderState* state, int fixedcm, float flash, int sceneWidth, int sceneHeight)
 {
 	tonemap.Render(state);
-	colormap.Render(state, fixedcm);
+	colormap.Render(state, fixedcm, flash);
 	lens.Render(state);
 	fxaa.Render(state);
 	customShaders.Run(state, "scene");
diff --git a/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.h b/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.h
index 09c0d25534..71defdcae4 100644
--- a/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.h
+++ b/src/common/rendering/hwrenderer/postprocessing/hw_postprocess.h
@@ -530,7 +530,7 @@ struct ColormapUniforms
 class PPColormap
 {
 public:
-	void Render(PPRenderState *renderstate, int fixedcm);
+	void Render(PPRenderState *renderstate, int fixedcm, float flash);
 
 private:
 	PPShader Colormap = { "shaders/pp/colormap.fp", "", ColormapUniforms::Desc() };
@@ -841,7 +841,7 @@ public:
 
 
 	void Pass1(PPRenderState *state, int fixedcm, int sceneWidth, int sceneHeight);
-	void Pass2(PPRenderState* state, int fixedcm, int sceneWidth, int sceneHeight);
+	void Pass2(PPRenderState* state, int fixedcm, float flash, int sceneWidth, int sceneHeight);
 };
 
 extern Postprocess hw_postprocess;
diff --git a/src/common/rendering/polyrenderer/backend/poly_framebuffer.cpp b/src/common/rendering/polyrenderer/backend/poly_framebuffer.cpp
index d1dbd63db0..9bbdd70723 100644
--- a/src/common/rendering/polyrenderer/backend/poly_framebuffer.cpp
+++ b/src/common/rendering/polyrenderer/backend/poly_framebuffer.cpp
@@ -232,7 +232,7 @@ static uint8_t ToIntColorComponent(float v)
 	return clamp((int)(v * 255.0f + 0.5f), 0, 255);
 }
 
-void PolyFrameBuffer::PostProcessScene(bool swscene, int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D)
+void PolyFrameBuffer::PostProcessScene(bool swscene, int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D)
 {
 	afterBloomDrawEndScene2D();
 
diff --git a/src/common/rendering/polyrenderer/backend/poly_framebuffer.h b/src/common/rendering/polyrenderer/backend/poly_framebuffer.h
index 84982d9d5f..a3c4eee292 100644
--- a/src/common/rendering/polyrenderer/backend/poly_framebuffer.h
+++ b/src/common/rendering/polyrenderer/backend/poly_framebuffer.h
@@ -39,7 +39,7 @@ public:
 	void SetTextureFilterMode() override;
 	void BeginFrame() override;
 	void BlurScene(float amount) override;
-	void PostProcessScene(bool swscene, int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D) override;
+	void PostProcessScene(bool swscene, int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D) override;
 	void AmbientOccludeScene(float m5) override;
 	//void SetSceneRenderTarget(bool useSSAO) override;
 
diff --git a/src/common/rendering/v_video.h b/src/common/rendering/v_video.h
index ac61291dd3..ae4b318d0f 100644
--- a/src/common/rendering/v_video.h
+++ b/src/common/rendering/v_video.h
@@ -242,7 +242,7 @@ public:
 	virtual FTexture *WipeStartScreen();
 	virtual FTexture *WipeEndScreen();
 
-	virtual void PostProcessScene(bool swscene, int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D) { if (afterBloomDrawEndScene2D) afterBloomDrawEndScene2D(); }
+	virtual void PostProcessScene(bool swscene, int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D) { if (afterBloomDrawEndScene2D) afterBloomDrawEndScene2D(); }
 
 	void ScaleCoordsFromWindow(int16_t &x, int16_t &y);
 
diff --git a/src/common/rendering/vulkan/renderer/vk_postprocess.cpp b/src/common/rendering/vulkan/renderer/vk_postprocess.cpp
index 6d3656fd92..ff2df75720 100644
--- a/src/common/rendering/vulkan/renderer/vk_postprocess.cpp
+++ b/src/common/rendering/vulkan/renderer/vk_postprocess.cpp
@@ -60,7 +60,7 @@ void VkPostprocess::SetActiveRenderTarget()
 	fb->GetRenderState()->SetRenderTarget(&buffers->PipelineImage[mCurrentPipelineImage], nullptr, buffers->GetWidth(), buffers->GetHeight(), VK_FORMAT_R16G16B16A16_SFLOAT, VK_SAMPLE_COUNT_1_BIT);
 }
 
-void VkPostprocess::PostProcessScene(int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D)
+void VkPostprocess::PostProcessScene(int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D)
 {
 	auto fb = GetVulkanFrameBuffer();
 	int sceneWidth = fb->GetBuffers()->GetSceneWidth();
@@ -71,7 +71,7 @@ void VkPostprocess::PostProcessScene(int fixedcm, const std::function<void()> &a
 	hw_postprocess.Pass1(&renderstate, fixedcm, sceneWidth, sceneHeight);
 	SetActiveRenderTarget();
 	afterBloomDrawEndScene2D();
-	hw_postprocess.Pass2(&renderstate, fixedcm, sceneWidth, sceneHeight);
+	hw_postprocess.Pass2(&renderstate, fixedcm, flash, sceneWidth, sceneHeight);
 }
 
 void VkPostprocess::BlitSceneToPostprocess()
diff --git a/src/common/rendering/vulkan/renderer/vk_postprocess.h b/src/common/rendering/vulkan/renderer/vk_postprocess.h
index 53390e00e6..67660fe514 100644
--- a/src/common/rendering/vulkan/renderer/vk_postprocess.h
+++ b/src/common/rendering/vulkan/renderer/vk_postprocess.h
@@ -44,7 +44,7 @@ public:
 	void RenderBuffersReset();
 
 	void SetActiveRenderTarget();
-	void PostProcessScene(int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D);
+	void PostProcessScene(int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D);
 
 	void AmbientOccludeScene(float m5);
 	void BlurScene(float gameinfobluramount);
diff --git a/src/common/rendering/vulkan/system/vk_framebuffer.cpp b/src/common/rendering/vulkan/system/vk_framebuffer.cpp
index 602d628b10..dd8ff2341b 100644
--- a/src/common/rendering/vulkan/system/vk_framebuffer.cpp
+++ b/src/common/rendering/vulkan/system/vk_framebuffer.cpp
@@ -343,10 +343,10 @@ void VulkanFrameBuffer::RenderTextureView(FCanvasTexture* tex, std::function<voi
 	tex->SetUpdated(true);
 }
 
-void VulkanFrameBuffer::PostProcessScene(bool swscene, int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D)
+void VulkanFrameBuffer::PostProcessScene(bool swscene, int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D)
 {
 	if (!swscene) mPostprocess->BlitSceneToPostprocess(); // Copy the resulting scene to the current post process texture
-	mPostprocess->PostProcessScene(fixedcm, afterBloomDrawEndScene2D);
+	mPostprocess->PostProcessScene(fixedcm, flash, afterBloomDrawEndScene2D);
 }
 
 const char* VulkanFrameBuffer::DeviceName() const
diff --git a/src/common/rendering/vulkan/system/vk_framebuffer.h b/src/common/rendering/vulkan/system/vk_framebuffer.h
index b1a7764525..9c5e5bf2d3 100644
--- a/src/common/rendering/vulkan/system/vk_framebuffer.h
+++ b/src/common/rendering/vulkan/system/vk_framebuffer.h
@@ -80,7 +80,7 @@ public:
 	void StartPrecaching() override;
 	void BeginFrame() override;
 	void BlurScene(float amount) override;
-	void PostProcessScene(bool swscene, int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D) override;
+	void PostProcessScene(bool swscene, int fixedcm, float flash, const std::function<void()> &afterBloomDrawEndScene2D) override;
 	void AmbientOccludeScene(float m5) override;
 	void SetSceneRenderTarget(bool useSSAO) override;
 	void UpdateShadowMap() override;
diff --git a/src/r_data/colormaps.h b/src/r_data/colormaps.h
index 5077f7a7b7..58381f15d4 100644
--- a/src/r_data/colormaps.h
+++ b/src/r_data/colormaps.h
@@ -45,15 +45,11 @@ inline uint32_t MakeSpecialColormap(int index)
 
 enum EColorManipulation
 {
-	CM_PLAIN2D = -2,			// regular 2D drawing.
-	CM_INVALID = -1,
 	CM_DEFAULT = 0,					// untranslated
 	CM_FIRSTSPECIALCOLORMAP,		// first special fixed colormap
-	CM_FIRSTSPECIALCOLORMAPFORCED = 0x08000000,	// first special fixed colormap, application forced (for 2D overlays)
 };
 
 #define CM_MAXCOLORMAP int(CM_FIRSTSPECIALCOLORMAP + SpecialColormaps.Size())
-#define CM_MAXCOLORMAPFORCED int(CM_FIRSTSPECIALCOLORMAPFORCED + SpecialColormaps.Size())
 
 
 #endif
diff --git a/src/rendering/hwrenderer/hw_entrypoint.cpp b/src/rendering/hwrenderer/hw_entrypoint.cpp
index c11e3d7d5c..83093ff828 100644
--- a/src/rendering/hwrenderer/hw_entrypoint.cpp
+++ b/src/rendering/hwrenderer/hw_entrypoint.cpp
@@ -144,6 +144,7 @@ sector_t* RenderViewpoint(FRenderViewpoint& mainvp, AActor* camera, IntRect* bou
 		di->Set3DViewport(RenderState);
 		di->SetViewArea();
 		auto cm = di->SetFullbrightFlags(mainview ? vp.camera->player : nullptr);
+		float flash = 1.f;
 		di->Viewpoint.FieldOfView = fov;	// Set the real FOV for the current scene (it's not necessarily the same as the global setting in r_viewpoint)
 
 		// Stereo mode specific perspective projection
@@ -165,7 +166,7 @@ sector_t* RenderViewpoint(FRenderViewpoint& mainvp, AActor* camera, IntRect* bou
 				RenderState.EnableDrawBuffers(1);
 			}
 
-			screen->PostProcessScene(false, cm, [&]() { di->DrawEndScene2D(mainvp.sector, RenderState); });
+			screen->PostProcessScene(false, cm, flash, [&]() { di->DrawEndScene2D(mainvp.sector, RenderState); });
 			PostProcess.Unclock();
 		}
 		di->EndDrawInfo();
diff --git a/src/rendering/swrenderer/r_swscene.cpp b/src/rendering/swrenderer/r_swscene.cpp
index d163df8f20..f6c58a8071 100644
--- a/src/rendering/swrenderer/r_swscene.cpp
+++ b/src/rendering/swrenderer/r_swscene.cpp
@@ -124,7 +124,7 @@ sector_t *SWSceneDrawer::RenderView(player_t *player)
 		DrawTexture(twod, fbtex.get(), 0, 0, DTA_SpecialColormap, map, TAG_DONE);
 		screen->Draw2D();
 		twod->Clear();
-		screen->PostProcessScene(true, CM_DEFAULT, [&]() {
+		screen->PostProcessScene(true, CM_DEFAULT, 1.f, [&]() {
 			SWRenderer->DrawRemainingPlayerSprites();
 			screen->Draw2D();
 			twod->Clear();
@@ -140,7 +140,7 @@ sector_t *SWSceneDrawer::RenderView(player_t *player)
 		int cm = CM_DEFAULT;
 		auto map = swrenderer::CameraLight::Instance()->ShaderColormap();
 		if (map) cm = (int)(ptrdiff_t)(map - SpecialColormaps.Data()) + CM_FIRSTSPECIALCOLORMAP;
-		screen->PostProcessScene(true, cm, [&]() { });
+		screen->PostProcessScene(true, cm, 1.f, [&]() { });
 
 		SWRenderer->DrawRemainingPlayerSprites();
 		screen->Draw2D();
diff --git a/wadsrc/static/shaders/pp/colormap.fp b/wadsrc/static/shaders/pp/colormap.fp
index 43cc28b25c..a60f4cfab0 100644
--- a/wadsrc/static/shaders/pp/colormap.fp
+++ b/wadsrc/static/shaders/pp/colormap.fp
@@ -6,8 +6,13 @@ layout(binding=0) uniform sampler2D SceneTexture;
 void main()
 {
 	vec4 frag = texture(SceneTexture, TexCoord);
-	float gray = (frag.r * 0.3 + frag.g * 0.56 + frag.b * 0.14);	
-	vec4 cm = uFixedColormapStart + gray * uFixedColormapRange;
-	FragColor = vec4(clamp(cm.rgb, 0.0, 1.0), frag.a);
+	frag.rgb = clamp(pow(frag.rgb, vec3(uFixedColormapStart.a)), 0.0, 1.0);
+	if (uFixedColormapRange.a == 0)
+	{
+		float gray = (frag.r * 0.3 + frag.g * 0.56 + frag.b * 0.14);	
+		vec4 cm = uFixedColormapStart + gray * uFixedColormapRange;
+		frag.rgb = clamp(cm.rgb, 0.0, 1.0);
+	}
+	FragColor = frag;
 }