diff --git a/data/shaders/crtpi_fragment.glsl b/data/shaders/crtpi_fragment.glsl
index cd63e80..c17d77d 100644
--- a/data/shaders/crtpi_fragment.glsl
+++ b/data/shaders/crtpi_fragment.glsl
@@ -31,6 +31,9 @@ out vec4 FragColor;
 // Uniforms
 uniform sampler2D Texture;
 uniform vec2 TextureSize;
+uniform float uVignette;   // 0 = sin viñeta, 1 = máxima
+uniform float uScanlines;  // 0 = desactivadas, 1 = plenas
+uniform float uChroma;     // 0 = sin aberración, 1 = máxima
 
 #if defined(CURVATURE)
 vec2 Distort(vec2 coord)
@@ -111,7 +114,11 @@ void main()
 	vec2 tc = vec2(texcoord.x, yCoord + dy);
 #endif
 
-	vec3 colour = texture(Texture, tc).rgb;
+	float ca = uChroma * 0.005;
+	vec3 colour;
+	colour.r = texture(Texture, tc + vec2(ca,  0.0)).r;
+	colour.g = texture(Texture, tc).g;
+	colour.b = texture(Texture, tc - vec2(ca,  0.0)).b;
 
 #if defined(SCANLINES)
 #if defined(GAMMA)
@@ -122,7 +129,7 @@ void main()
 #endif
 #endif
 	scanLineWeight *= BLOOM_FACTOR;
-	colour *= scanLineWeight;
+	colour *= mix(1.0, scanLineWeight, uScanlines);
 
 #if defined(GAMMA)
 #if defined(FAKE_GAMMA)
@@ -133,6 +140,12 @@ void main()
 #endif
 #endif
 
+	if (uVignette > 0.0) {
+		vec2 uv = texcoord - vec2(0.5);
+		float vig = 1.0 - dot(uv, uv) * uVignette * 4.0;
+		colour *= clamp(vig, 0.0, 1.0);
+	}
+
 #if MASK_TYPE == 0
 	FragColor = vec4(colour, 1.0);
 #elif MASK_TYPE == 1
diff --git a/data/shaders/crtpi_fragment_es.glsl b/data/shaders/crtpi_fragment_es.glsl
index 363b6a9..c10a2d0 100644
--- a/data/shaders/crtpi_fragment_es.glsl
+++ b/data/shaders/crtpi_fragment_es.glsl
@@ -34,6 +34,9 @@ out vec4 FragColor;
 // Uniforms
 uniform sampler2D Texture;
 uniform vec2 TextureSize;
+uniform float uVignette;   // 0 = sin viñeta, 1 = máxima
+uniform float uScanlines;  // 0 = desactivadas, 1 = plenas
+uniform float uChroma;     // 0 = sin aberración, 1 = máxima
 
 #if defined(CURVATURE)
 vec2 Distort(vec2 coord)
@@ -114,7 +117,11 @@ void main()
 	vec2 tc = vec2(texcoord.x, yCoord + dy);
 #endif
 
-	vec3 colour = texture(Texture, tc).rgb;
+	float ca = uChroma * 0.005;
+	vec3 colour;
+	colour.r = texture(Texture, tc + vec2(ca,  0.0)).r;
+	colour.g = texture(Texture, tc).g;
+	colour.b = texture(Texture, tc - vec2(ca,  0.0)).b;
 
 #if defined(SCANLINES)
 #if defined(GAMMA)
@@ -125,7 +132,7 @@ void main()
 #endif
 #endif
 	scanLineWeight *= BLOOM_FACTOR;
-	colour *= scanLineWeight;
+	colour *= mix(1.0, scanLineWeight, uScanlines);
 
 #if defined(GAMMA)
 #if defined(FAKE_GAMMA)
@@ -136,6 +143,12 @@ void main()
 #endif
 #endif
 
+	if (uVignette > 0.0) {
+		vec2 uv = texcoord - vec2(0.5);
+		float vig = 1.0 - dot(uv, uv) * uVignette * 4.0;
+		colour *= clamp(vig, 0.0, 1.0);
+	}
+
 #if MASK_TYPE == 0
 	FragColor = vec4(colour, 1.0);
 #elif MASK_TYPE == 1
diff --git a/source/core/rendering/opengl/opengl_shader.cpp b/source/core/rendering/opengl/opengl_shader.cpp
index 9085eba..090f79c 100644
--- a/source/core/rendering/opengl/opengl_shader.cpp
+++ b/source/core/rendering/opengl/opengl_shader.cpp
@@ -30,6 +30,7 @@ auto OpenGLShader::initGLExtensions() -> bool {
     glUseProgram = (PFNGLUSEPROGRAMPROC)SDL_GL_GetProcAddress("glUseProgram");
     glDeleteProgram = (PFNGLDELETEPROGRAMPROC)SDL_GL_GetProcAddress("glDeleteProgram");
     glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)SDL_GL_GetProcAddress("glGetUniformLocation");
+    glUniform1f = (PFNGLUNIFORM1FPROC)SDL_GL_GetProcAddress("glUniform1f");
     glUniform2f = (PFNGLUNIFORM2FPROC)SDL_GL_GetProcAddress("glUniform2f");
     glGenVertexArrays = (PFNGLGENVERTEXARRAYSPROC)SDL_GL_GetProcAddress("glGenVertexArrays");
     glBindVertexArray = (PFNGLBINDVERTEXARRAYPROC)SDL_GL_GetProcAddress("glBindVertexArray");
@@ -44,7 +45,8 @@ auto OpenGLShader::initGLExtensions() -> bool {
     return (glCreateShader != nullptr) && (glShaderSource != nullptr) && (glCompileShader != nullptr) && (glGetShaderiv != nullptr) &&
         (glGetShaderInfoLog != nullptr) && (glDeleteShader != nullptr) && (glAttachShader != nullptr) && (glCreateProgram != nullptr) &&
         (glLinkProgram != nullptr) && (glValidateProgram != nullptr) && (glGetProgramiv != nullptr) && (glGetProgramInfoLog != nullptr) &&
-        (glUseProgram != nullptr) && (glDeleteProgram != nullptr) && (glGetUniformLocation != nullptr) && (glUniform2f != nullptr) &&
+        (glUseProgram != nullptr) && (glDeleteProgram != nullptr) && (glGetUniformLocation != nullptr) &&
+        (glUniform1f != nullptr) && (glUniform2f != nullptr) &&
         (glGenVertexArrays != nullptr) && (glBindVertexArray != nullptr) && (glDeleteVertexArrays != nullptr) &&
         (glGenBuffers != nullptr) && (glBindBuffer != nullptr) && (glBufferData != nullptr) && (glDeleteBuffers != nullptr) &&
         (glVertexAttribPointer != nullptr) && (glEnableVertexAttribArray != nullptr);
@@ -320,7 +322,7 @@ auto OpenGLShader::init(SDL_Window* window,
     // Crear geometría del quad
     createQuadGeometry();
 
-    // Obtener ubicación del uniform TextureSize
+    // Obtener ubicaciones de uniforms y configurar valores iniciales
     glUseProgram(program_id_);
     texture_size_location_ = glGetUniformLocation(program_id_, "TextureSize");
     if (texture_size_location_ != -1) {
@@ -334,6 +336,14 @@ auto OpenGLShader::init(SDL_Window* window,
         SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
             "Uniform 'TextureSize' not found in shader");
     }
+
+    // Uniforms PostFX
+    vignette_location_  = glGetUniformLocation(program_id_, "uVignette");
+    scanlines_location_ = glGetUniformLocation(program_id_, "uScanlines");
+    chroma_location_    = glGetUniformLocation(program_id_, "uChroma");
+    if (vignette_location_ != -1)  { glUniform1f(vignette_location_,  postfx_vignette_);  }
+    if (scanlines_location_ != -1) { glUniform1f(scanlines_location_, postfx_scanlines_); }
+    if (chroma_location_ != -1)    { glUniform1f(chroma_location_,    postfx_chroma_);    }
     glUseProgram(0);
 
     is_initialized_ = true;
@@ -388,6 +398,11 @@ void OpenGLShader::render() {
     glUseProgram(program_id_);
     checkGLError("glUseProgram");
 
+    // Pasar uniforms PostFX
+    if (vignette_location_ != -1)  { glUniform1f(vignette_location_,  postfx_vignette_);  }
+    if (scanlines_location_ != -1) { glUniform1f(scanlines_location_, postfx_scanlines_); }
+    if (chroma_location_ != -1)    { glUniform1f(chroma_location_,    postfx_chroma_);    }
+
     // Configurar viewport (obtener tamaño lógico de SDL)
     int logical_w;
     int logical_h;
@@ -449,6 +464,12 @@ void OpenGLShader::render() {
     glViewport(old_viewport[0], old_viewport[1], old_viewport[2], old_viewport[3]);
 }
 
+void OpenGLShader::setPostFXParams(float vignette, float scanlines, float chroma) {
+    postfx_vignette_  = vignette;
+    postfx_scanlines_ = scanlines;
+    postfx_chroma_    = chroma;
+}
+
 void OpenGLShader::setTextureSize(float width, float height) {
     if (!is_initialized_ || program_id_ == 0) {
         return;
diff --git a/source/core/rendering/opengl/opengl_shader.hpp b/source/core/rendering/opengl/opengl_shader.hpp
index b5d9c1a..2e20b4c 100644
--- a/source/core/rendering/opengl/opengl_shader.hpp
+++ b/source/core/rendering/opengl/opengl_shader.hpp
@@ -30,6 +30,7 @@ class OpenGLShader : public ShaderBackend {
 
         void render() override;
         void setTextureSize(float width, float height) override;
+        void setPostFXParams(float vignette, float scanlines, float chroma) override;
         void cleanup() final;
         [[nodiscard]] auto isHardwareAccelerated() const -> bool override { return is_initialized_; }
 
@@ -55,6 +56,14 @@ class OpenGLShader : public ShaderBackend {
 
         // Ubicaciones de uniforms
         GLint texture_size_location_ = -1;
+        GLint vignette_location_ = -1;
+        GLint scanlines_location_ = -1;
+        GLint chroma_location_ = -1;
+
+        // Valores cacheados de PostFX
+        float postfx_vignette_ = 0.6F;
+        float postfx_scanlines_ = 0.7F;
+        float postfx_chroma_ = 0.15F;
 
         // Tamaños
         int window_width_ = 0;
@@ -83,6 +92,7 @@ class OpenGLShader : public ShaderBackend {
         PFNGLUSEPROGRAMPROC glUseProgram = nullptr;
         PFNGLDELETEPROGRAMPROC glDeleteProgram = nullptr;
         PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation = nullptr;
+        PFNGLUNIFORM1FPROC glUniform1f = nullptr;
         PFNGLUNIFORM2FPROC glUniform2f = nullptr;
         PFNGLGENVERTEXARRAYSPROC glGenVertexArrays = nullptr;
         PFNGLBINDVERTEXARRAYPROC glBindVertexArray = nullptr;
diff --git a/source/core/rendering/screen.cpp b/source/core/rendering/screen.cpp
index 0bc7c36..cc845bf 100644
--- a/source/core/rendering/screen.cpp
+++ b/source/core/rendering/screen.cpp
@@ -448,32 +448,13 @@ auto loadData(const std::string& filepath) -> std::vector<uint8_t> {
 
 // Carga el contenido de los archivos GLSL
 void Screen::loadShaders() {
-    // Obtener nombres de fichero desde el preset actual (o usar fallback)
-    std::string preset_vertex = "crtpi_vertex.glsl";
-    std::string preset_fragment = "crtpi_fragment.glsl";
-    if (!Options::postfx_presets.empty()) {
-        const auto& preset = Options::postfx_presets[static_cast<size_t>(Options::current_postfx_preset)];
-        if (!preset.vertex.empty()) {
-            preset_vertex = preset.vertex;
-        }
-        if (!preset.fragment.empty()) {
-            preset_fragment = preset.fragment;
-        }
-    }
-
     if (vertex_shader_source_.empty()) {
         // Detectar si necesitamos OpenGL ES (Raspberry Pi)
-        // Intentar cargar versión ES primero si existe (reemplaza .glsl por _es.glsl)
-        std::string vertex_es = preset_vertex;
-        auto pos = vertex_es.rfind(".glsl");
-        if (pos != std::string::npos) {
-            vertex_es.insert(pos, "_es");
-        }
-        auto data = loadData(Resource::List::get()->get(vertex_es));
+        // Intentar cargar versión ES primero si existe
+        auto data = loadData(Resource::List::get()->get("crtpi_vertex_es.glsl"));
 
         if (data.empty()) {
-            // Si no existe versión ES, usar versión Desktop
-            data = loadData(Resource::List::get()->get(preset_vertex));
+            data = loadData(Resource::List::get()->get("crtpi_vertex.glsl"));
             std::cout << "Usando shaders OpenGL Desktop 3.3\n";
         } else {
             std::cout << "Usando shaders OpenGL ES 3.0 (Raspberry Pi)\n";
@@ -485,16 +466,10 @@ void Screen::loadShaders() {
     }
     if (fragment_shader_source_.empty()) {
         // Intentar cargar versión ES primero si existe
-        std::string fragment_es = preset_fragment;
-        auto pos = fragment_es.rfind(".glsl");
-        if (pos != std::string::npos) {
-            fragment_es.insert(pos, "_es");
-        }
-        auto data = loadData(Resource::List::get()->get(fragment_es));
+        auto data = loadData(Resource::List::get()->get("crtpi_fragment_es.glsl"));
 
         if (data.empty()) {
-            // Si no existe versión ES, usar versión Desktop
-            data = loadData(Resource::List::get()->get(preset_fragment));
+            data = loadData(Resource::List::get()->get("crtpi_fragment.glsl"));
         }
 
         if (!data.empty()) {
@@ -503,6 +478,14 @@ void Screen::loadShaders() {
     }
 }
 
+// Aplica los parámetros del preset actual al backend de shaders
+void Screen::applyCurrentPostFXPreset() {
+    if (shader_backend_ && !Options::postfx_presets.empty()) {
+        const auto& p = Options::postfx_presets[static_cast<size_t>(Options::current_postfx_preset)];
+        shader_backend_->setPostFXParams(p.vignette, p.scanlines, p.chroma);
+    }
+}
+
 // Inicializa los shaders
 void Screen::initShaders() {
     if (!Options::video.postfx) {
@@ -525,6 +508,8 @@ void Screen::initShaders() {
     }
     shader_backend_->init(window_, tex, vertex_shader_source_, fragment_shader_source_);
 #endif
+
+    applyCurrentPostFXPreset();
 }
 
 // Obtiene información sobre la pantalla
diff --git a/source/core/rendering/screen.hpp b/source/core/rendering/screen.hpp
index 79dbd03..f85d4be 100644
--- a/source/core/rendering/screen.hpp
+++ b/source/core/rendering/screen.hpp
@@ -117,6 +117,7 @@ class Screen {
         auto findPalette(const std::string& name) -> size_t;  // Localiza la paleta dentro del vector de paletas
         void initShaders();                                   // Inicializa los shaders
         void loadShaders();                                   // Carga el contenido del archivo GLSL
+        void applyCurrentPostFXPreset();                      // Aplica los parámetros del preset actual al backend
         void renderInfo();                                    // Muestra información por pantalla
         void getDisplayInfo();                                // Obtiene información sobre la pantalla
         auto initSDLVideo() -> bool;                          // Arranca SDL VIDEO y crea la ventana
diff --git a/source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp b/source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp
index 5fe5e97..0298f07 100644
--- a/source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp
+++ b/source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp
@@ -416,4 +416,10 @@ auto SDL3GPUShader::createShaderSPIRV(SDL_GPUDevice* device,
     return shader;
 }
 
+void SDL3GPUShader::setPostFXParams(float vignette, float scanlines, float chroma) {
+    uniforms_.vignette_strength  = vignette;
+    uniforms_.scanline_strength  = scanlines;
+    uniforms_.chroma_strength    = chroma;
+}
+
 }  // namespace Rendering
diff --git a/source/core/rendering/sdl3gpu/sdl3gpu_shader.hpp b/source/core/rendering/sdl3gpu/sdl3gpu_shader.hpp
index 8c09b33..43521af 100644
--- a/source/core/rendering/sdl3gpu/sdl3gpu_shader.hpp
+++ b/source/core/rendering/sdl3gpu/sdl3gpu_shader.hpp
@@ -41,6 +41,9 @@ class SDL3GPUShader : public ShaderBackend {
         // Sube píxeles ARGB8888 desde CPU; llamado antes de render()
         void uploadPixels(const Uint32* pixels, int width, int height) override;
 
+        // Actualiza los parámetros de intensidad de los efectos PostFX
+        void setPostFXParams(float vignette, float scanlines, float chroma) override;
+
     private:
         static auto createShaderMSL(SDL_GPUDevice* device,
             const char* msl_source,
diff --git a/source/core/rendering/shader_backend.hpp b/source/core/rendering/shader_backend.hpp
index 2a55433..559ace0 100644
--- a/source/core/rendering/shader_backend.hpp
+++ b/source/core/rendering/shader_backend.hpp
@@ -52,6 +52,14 @@ class ShaderBackend {
          */
         virtual void uploadPixels(const Uint32* /*pixels*/, int /*width*/, int /*height*/) {}
 
+        /**
+         * @brief Establece los parámetros de intensidad de los efectos PostFX
+         * @param vignette Intensidad de la viñeta (0.0 = ninguna, 1.0 = máxima)
+         * @param scanlines Intensidad de las scanlines (0.0 = desactivadas, 1.0 = máximas)
+         * @param chroma Intensidad de la aberración cromática (0.0 = ninguna, 1.0 = máxima)
+         */
+        virtual void setPostFXParams(float /*vignette*/, float /*scanlines*/, float /*chroma*/) {}
+
         /**
          * @brief Verifica si el backend está usando aceleración por hardware
          * @return true si usa aceleración (OpenGL/Metal/Vulkan)
diff --git a/source/game/options.cpp b/source/game/options.cpp
index 9d44bc2..bb5c68d 100644
--- a/source/game/options.cpp
+++ b/source/game/options.cpp
@@ -681,11 +681,14 @@ auto loadPostFXFromFile() -> bool {
                 if (p.contains("name")) {
                     preset.name = p["name"].get_value<std::string>();
                 }
-                if (p.contains("vertex")) {
-                    preset.vertex = p["vertex"].get_value<std::string>();
+                if (p.contains("vignette")) {
+                    try { preset.vignette = p["vignette"].get_value<float>(); } catch (...) {}
                 }
-                if (p.contains("fragment")) {
-                    preset.fragment = p["fragment"].get_value<std::string>();
+                if (p.contains("scanlines")) {
+                    try { preset.scanlines = p["scanlines"].get_value<float>(); } catch (...) {}
+                }
+                if (p.contains("chroma")) {
+                    try { preset.chroma = p["chroma"].get_value<float>(); } catch (...) {}
                 }
                 postfx_presets.push_back(preset);
             }
@@ -720,13 +723,24 @@ auto savePostFXToFile() -> bool {
     }
 
     file << "# JailDoctor's Dilemma - PostFX Presets\n";
-    file << "# Add or modify presets to customize post-processing effects.\n";
-    file << "# vertex and fragment reference shader filenames from the shaders directory.\n";
+    file << "# Each preset defines the intensity of post-processing effects (0.0 to 1.0).\n";
+    file << "# vignette: screen darkening at the edges\n";
+    file << "# scanlines: horizontal scanline effect\n";
+    file << "# chroma: chromatic aberration (RGB color fringing)\n";
     file << "\n";
     file << "presets:\n";
     file << "  - name: \"CRT\"\n";
-    file << "    vertex: \"crtpi_vertex.glsl\"\n";
-    file << "    fragment: \"crtpi_fragment.glsl\"\n";
+    file << "    vignette: 0.6\n";
+    file << "    scanlines: 0.7\n";
+    file << "    chroma: 0.15\n";
+    file << "  - name: \"SCANLINES\"\n";
+    file << "    vignette: 0.0\n";
+    file << "    scanlines: 0.8\n";
+    file << "    chroma: 0.0\n";
+    file << "  - name: \"SUBTLE\"\n";
+    file << "    vignette: 0.3\n";
+    file << "    scanlines: 0.4\n";
+    file << "    chroma: 0.05\n";
 
     file.close();
 
@@ -736,7 +750,9 @@ auto savePostFXToFile() -> bool {
 
     // Cargar los presets recién creados
     postfx_presets.clear();
-    postfx_presets.push_back({"CRT", "crtpi_vertex.glsl", "crtpi_fragment.glsl"});
+    postfx_presets.push_back({"CRT", 0.6F, 0.7F, 0.15F});
+    postfx_presets.push_back({"SCANLINES", 0.0F, 0.8F, 0.0F});
+    postfx_presets.push_back({"SUBTLE", 0.3F, 0.4F, 0.05F});
     current_postfx_preset = 0;
 
     return true;
diff --git a/source/game/options.hpp b/source/game/options.hpp
index 42edfff..e27652c 100644
--- a/source/game/options.hpp
+++ b/source/game/options.hpp
@@ -116,9 +116,10 @@ struct Game {
 
 // Estructura para un preset de PostFX
 struct PostFXPreset {
-        std::string name;      // Nombre del preset
-        std::string vertex;    // Nombre del fichero vertex shader
-        std::string fragment;  // Nombre del fichero fragment shader
+        std::string name;          // Nombre del preset
+        float vignette{0.6F};     // Intensidad de la viñeta (0.0 = ninguna, 1.0 = máxima)
+        float scanlines{0.7F};    // Intensidad de las scanlines (0.0 = desactivadas, 1.0 = máximas)
+        float chroma{0.15F};      // Intensidad de la aberración cromática (0.0 = ninguna, 1.0 = máxima)
 };
 
 // --- Variables globales ---