diff --git a/.ci/clang-tidy.sh b/.ci/clang-tidy.sh
index e5861a2..f567cec 100755
--- a/.ci/clang-tidy.sh
+++ b/.ci/clang-tidy.sh
@@ -9,7 +9,7 @@ filelist="$(find . -not \( -path './*build*' -prune \) -not \( -path './include'
 for file in $filelist; do
   if echo "$file" | grep -q -E ".*(\.cpp|\.h|\.hpp)$" ; then
     #Extra check missing dependencies due to clang-tidy doesn't toggle exit code.
-    clang_tidy_lib_check="$(clang-tidy -warnings-as-errors='*' --color -header-filter='.*,-cpptoml.hpp' "$file" -- -I. -std=c++14 2>&1)"
+    clang_tidy_lib_check="$(clang-tidy -warnings-as-errors='*' --color "$file" -- -I. -std=c++14 2>&1)"
     for tidy_line in $clang_tidy_lib_check; do
       echo "$tidy_line" | grep -q -v -E "^Error while processing*"
       if [ $? -eq 1 ]; then
diff --git a/.clang-tidy b/.clang-tidy
index de644d1..f404c2e 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -1,2 +1,3 @@
 Checks: '*,-llvm-header-guard,-fuchsia*,-cppcoreguidelines-pro-bounds-pointer-arithmetic,-cppcoreguidelines-pro-bounds-constant-array-index,-bugprone-narrowing-conversions,-cppcoreguidelines-narrowing-conversions,-cppcoreguidelines-pro-type-const-cast,-cppcoreguidelines-pro-type-reinterpret-cast,-hicpp-signed-bitwise,-bugprone-exception-escape,-cppcoreguidelines-pro-type-member-init,-cppcoreguidelines-pro-type-cstyle-cast,-hicpp-member-init,-google-readability-namespace-comments,-llvm-namespace-comment,-cppcoreguidelines-pro-type-vararg,-hicpp-vararg,-modernize-use-trailing-return-type'
-WarningsAsErrors: 'true'
\ No newline at end of file
+WarningsAsErrors: 'true'
+HeaderFilterRegex: '.*,-catch.hpp'
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a23c62..828a9ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,8 +12,7 @@ project(library)
 set(CMAKE_CXX_STANDARD 14)
 
 # enable clang_tidy
-set(CMAKE_CXX_CLANG_TIDY "clang-tidy;-checks=*")
-set(CMAKE_CXX_CLANG_TIDY clang-tidy;-header-filter=.;)
+set(CMAKE_CXX_CLANG_TIDY clang-tidy;)
 
 
 file(GLOB_RECURSE SOURCES src/*.cpp)
@@ -22,7 +21,7 @@ file(GLOB_RECURSE TESTS test/*.cpp)
 include_directories(src)
 include_directories(test)
 
-add_library(library ${SOURCES} ${HEADERS} src/FontType.cpp)
+add_library(library ${SOURCES} ${HEADERS})
 
 file(COPY "${CMAKE_SOURCE_DIR}/src/"
         DESTINATION "${CMAKE_SOURCE_DIR}/include"
diff --git a/src/Color.cpp b/src/Color.cpp
index 85ac7df..3acc402 100644
--- a/src/Color.cpp
+++ b/src/Color.cpp
@@ -30,4 +30,12 @@ namespace vkvm {
     auto Color::setBlue(unsigned char value) -> void {
         blue = value;
     }
+
+    bool Color::operator==(const Color &other) const {
+        return this->blue == other.blue && this->green == other.green && this->red == other.red;
+    }
+
+    bool Color::operator!=(const Color &other) const {
+        return this->blue != other.blue || this->green != other.green || this->red != other.red;
+    }
 }
\ No newline at end of file
diff --git a/src/Color.hpp b/src/Color.hpp
index a8159b1..909eb9e 100644
--- a/src/Color.hpp
+++ b/src/Color.hpp
@@ -30,10 +30,17 @@ namespace vkvm {
 
         auto setBlue(unsigned char value) -> void;
 
+        bool operator==(const Color &other) const ;
+
+        bool operator!=(const Color &other) const ;
+
     };
 
     const static Color black = Color(0, 0, 0);
     const static Color white = Color(255, 255, 255);
+    const static Color green = Color(0, 255, 0);
+    const static Color red = Color(255, 0, 0);
+    const static Color blue = Color(0, 0, 255);
 
 }
 
diff --git a/src/internal.hpp b/src/internal.hpp
index a2fe49f..c29e932 100644
--- a/src/internal.hpp
+++ b/src/internal.hpp
@@ -55,7 +55,7 @@ constexpr int keyboardBufferSize = 16;
         key_t sharedMemoryKey;
         int sharedMemorySize;
         int interruptEntyCount = 256; //NOLINT
-        int interruptEntrysPerEventType = 8;
+        int interruptEntrysPerEventType = 8; //NOLINT
         int reservedSize = 1024; //NOLINT
         std::vector<std::function<void()>> eventTable;
     };
diff --git a/src/vkvm.cpp b/src/vkvm.cpp
index 57cf76e..46e5709 100644
--- a/src/vkvm.cpp
+++ b/src/vkvm.cpp
@@ -23,9 +23,9 @@ namespace vkvm {
             setHeight(600);// NOLINT
             setWidth(800);// NOLINT
             setMousePosition(42, 42);// NOLINT
-            setBackgroundColor(Color(200, 50, 20));// NOLINT
-            setForegroundColor(Color(20, 200, 50));// NOLINT
-            setMode(GraphicMode::RGB);// NOLINT
+            setBackgroundColor(black);
+            setForegroundColor(white);
+            setMode(GraphicMode::RGB);
             setRedrawInterval(20);// NOLINT
             setTimerInterruptInterval(10);// NOLINT
         }
@@ -69,10 +69,22 @@ namespace vkvm {
     }
 
     auto getPixel(int x, int y) -> Color {
-        //TODO(julian): other than RGB colores
-        //only RGB colores for now
         unsigned char *ptr = reinterpret_cast<unsigned char *>(getPixelArea()) + (y * getWidth() + x) * 3;
-        return {ptr[0], ptr[1], ptr[2]};
+
+        Color color = {ptr[0], ptr[1], ptr[2]};
+
+        if(getMode() == GraphicMode::TwoColors || getMode() == GraphicMode::Text) {
+            if(color != getForegroundColor()) {
+                color = getBackgroundColor();
+            }
+        }
+
+        else if(getMode() == GraphicMode::Gray_256) {
+            unsigned char average = (color.getBlue() + color.getGreen() + color.getRed()) / 3;
+            color = {average, average, average};
+        }
+
+        return color;
     }
 
     auto setText(std::string text) -> bool {
diff --git a/test/color_test.cpp b/test/color_test.cpp
new file mode 100644
index 0000000..9037a40
--- /dev/null
+++ b/test/color_test.cpp
@@ -0,0 +1,45 @@
+#include "../src/vkvm.hpp"
+#include <catch2/catch.hpp>
+#include <iostream>
+
+TEST_CASE("Colors") {
+    vkvm::initialize(0);
+    vkvm::setPixel(10, 10, vkvm::black);//NOLINT
+    vkvm::setPixel(11, 11, vkvm::white);//NOLINT
+    vkvm::setPixel(12, 12, vkvm::green);//NOLINT
+    vkvm::setPixel(13, 13, vkvm::red);//NOLINT
+    vkvm::setPixel(14, 14, vkvm::blue);//NOLINT
+    vkvm::setPixel(15, 15, vkvm::Color(66, 77, 88)); //NOLINT
+
+    SECTION("RGB") {
+        REQUIRE(vkvm::getPixel(10, 10) == vkvm::black);//NOLINT
+        REQUIRE(vkvm::getPixel(11, 11) == vkvm::white);//NOLINT
+        REQUIRE(vkvm::getPixel(12, 12) == vkvm::green);//NOLINT
+        REQUIRE(vkvm::getPixel(13, 13) == vkvm::red);//NOLINT
+        REQUIRE(vkvm::getPixel(14, 14) == vkvm::blue);//NOLINT
+        REQUIRE(vkvm::getPixel(15, 15) == vkvm::Color(66, 77, 88));//NOLINT
+    }
+
+    SECTION("TwoColors") {
+        vkvm::setMode(vkvm::TwoColors);
+        REQUIRE(vkvm::getPixel(10, 10) == vkvm::black);//NOLINT
+        REQUIRE(vkvm::getPixel(11, 11) == vkvm::white);//NOLINT
+        REQUIRE(vkvm::getPixel(12, 12) == vkvm::black);//NOLINT
+        REQUIRE(vkvm::getPixel(13, 13) == vkvm::black);//NOLINT
+        REQUIRE(vkvm::getPixel(14, 14) == vkvm::black);//NOLINT
+        REQUIRE(vkvm::getPixel(15, 15) == vkvm::black);//NOLINT
+
+    }
+
+    SECTION("Gray256") {
+        vkvm::setMode(vkvm::Gray_256);
+        REQUIRE(vkvm::getPixel(10, 10) == vkvm::black);//NOLINT
+        REQUIRE(vkvm::getPixel(11, 11) == vkvm::white);//NOLINT
+        REQUIRE(vkvm::getPixel(12, 12) == vkvm::Color(85, 85, 85));//NOLINT
+        REQUIRE(vkvm::getPixel(13, 13) == vkvm::Color(85, 85, 85));//NOLINT
+        REQUIRE(vkvm::getPixel(14, 14) == vkvm::Color(85, 85, 85));//NOLINT
+        REQUIRE(vkvm::getPixel(15, 15) == vkvm::Color(77, 77, 77));//NOLINT
+    }
+
+}
+