diff --git a/bmpimage.cpp b/bmpimage.cpp
index b64baaa..b2ba7ec 100644
--- a/bmpimage.cpp
+++ b/bmpimage.cpp
@@ -1,3 +1,4 @@
+#include <cmath>
 #include "bmpimage.h"
 
 BMPImage::BMPImage(const BitmapFileHeader &fileHeader, const BITMAPINFOHEADER &infoHeader, const PixelArray &pixelArray)
@@ -149,9 +150,9 @@ BMPImage readBMPImage(const std::string &filename) {
 }
 
 Pixel operator+(const Pixel &p1, const Pixel &p2) {
-    const uint8_t r = p1.r + p2.r;
-    const uint8_t g = p1.g + p2.g;
-    const uint8_t b = p1.b + p2.b;
+    const uint8_t r = ui8_clamp((int) p1.r + p2.r);
+    const uint8_t g = ui8_clamp((int) p1.g + p2.g);
+    const uint8_t b = ui8_clamp((int) p1.b + p2.b);
     return {r, g, b};
 }
 
@@ -284,7 +285,6 @@ BMPImage upscale1_5x(BMPImage &img) {
             }
     }
     return {newPixelArray};
-
 }
 
 BMPImage textImg(const std::u16string &str, Font *font, uint8_t scale, Pixel background_color, Pixel font_color) {
@@ -309,6 +309,128 @@ BMPImage textImg(const std::u16string &str, Font *font, uint8_t scale, Pixel bac
     return {pixels};
 }
 
+BMPImage upscale1_5x_ver2(BMPImage &img) {
+    auto oldPixels = img.pixels();
+    const uint32_t newHeight = img.height() * 3 / 2;
+    const uint32_t newWidth = img.width() * 3 / 2;
+    PixelArray newPixelArray(newWidth, newHeight);
+    for (int i = 0; i < newHeight; ++i) {
+        int oldi = std::round(i * 2 / 3.);
+        if ((i + 1) % 3 == 0) {
+            if (i == newHeight - 1)
+                newPixelArray(i, 0) = oldPixels(oldi, 0) / 2;
+            else {
+                newPixelArray(i, 0) = oldPixels(oldi, 0) / 2 + oldPixels(oldi + 1, 0) / 2;
+            }
+            continue;
+        }
+        for (int j = 0; j < newWidth; ++j) {
+            int oldj = std::round(j * 2 / 3.);
+            if ((j + 1) % 3 != 0)
+                newPixelArray(i, j) = oldPixels(oldi, oldj);
+            else if (j == newWidth - 1)
+                newPixelArray(i, j) = oldPixels(oldi, oldj) / 2;
+            else
+                newPixelArray(i, j) = oldPixels(oldi, oldj) / 2 + oldPixels(oldi, oldj + 1) / 2;
+        }
+    }
+    for (int i = 2; i < newHeight; i += 3) {
+        if (i == newHeight - 1)
+            for (int j = 0; j < newWidth; ++j) {
+                newPixelArray(i, j) = newPixelArray(i - 1, j) / 2;
+            }
+        else
+            for (int j = 1; j < newWidth; ++j) {
+                if (j == newWidth - 1) {
+                    newPixelArray(i, j) = newPixelArray(i, j - 1) / 2;
+                    continue;
+                }
+                auto f00 = newPixelArray(i - 1, j - 1);
+                auto f10 = newPixelArray(i - 1, j + 1);
+                auto f01 = newPixelArray(i + 1, j - 1);
+                auto f11 = newPixelArray(i + 1, j + 1);
+                newPixelArray(i, j) = f10 / 4 + f00 / 4 + f01 / 4 + f11 / 4;
+            }
+    }
+    return {newPixelArray};
+}
+
+Pixel operator-(const Pixel &p1, const Pixel &p2) {
+    auto r = ui8_clamp((int) p1.r - p2.r);
+    auto g = ui8_clamp((int) p1.g - p2.g);
+    auto b = ui8_clamp((int) p1.b - p2.b);
+    return {r, g, b};
+}
+
+BMPImage upscale2x_ver2(BMPImage &img) {
+    auto oldPixels = img.pixels();
+    const uint32_t newHeight = img.height() * 2;
+    const uint32_t newWidth = img.width() * 2;
+    PixelArray newPixelArray(newWidth, newHeight);
+    for (int i = 0; i < newHeight; ++i) {
+        if ((i + 1) % 2 == 0) {
+            if (i == newHeight - 1)
+                newPixelArray(i, 0) = oldPixels(i / 2, 0) / 2;
+            else
+                newPixelArray(i, 0) = oldPixels(i / 2, 0) / 2 + oldPixels(i / 2 + 1, 0) / 2;
+            continue;
+        }
+        for (int j = 0; j < newWidth; ++j) {
+            if (j % 2 == 0)
+                newPixelArray(i, j) = oldPixels(i / 2, j / 2);
+            else if (j == newWidth - 1)
+                newPixelArray(i, j) = oldPixels(i / 2, j / 2) / 2;
+            else
+                newPixelArray(i, j) = oldPixels(i / 2, j / 2) / 2 + oldPixels(i / 2, j / 2 + 1) / 2;
+        }
+    }
+    for (int i = 1; i < newHeight; i += 2) {
+        if (i == newHeight - 1)
+            for (int j = 1; j < newWidth; ++j) {
+                newPixelArray(i, j) = newPixelArray(i - 1, j) / 2;
+            }
+        else
+            for (int j = 1; j < newWidth; ++j) {
+                if (j == newWidth - 1) {
+                    newPixelArray(i, j) = newPixelArray(i, j - 1) / 2;
+                    continue;
+                }
+                auto f00 = newPixelArray(i - 1, j - 1);
+                auto f10 = newPixelArray(i - 1, j + 1);
+                auto f01 = newPixelArray(i + 1, j - 1);
+                auto f11 = newPixelArray(i + 1, j + 1);
+                newPixelArray(i, j) = f10 / 4 + f00 / 4 + f01 / 4 + f11 / 4;
+            }
+    }
+    return {newPixelArray};
+}
+
+BMPImage filter(BMPImage &img, int mask[9], uint8_t modifier) {
+    auto origPixels = img.pixels_copy();
+    PixelArray pixels(img.width(), img.height());
+    for (int y = 1; y < img.height() - 1; ++y) {
+        for (int x = 1; x < img.width() - 1; ++x) {
+            auto p1 = origPixels(y - 1, x - 1);
+            auto p2 = origPixels(y - 1, x);
+            auto p3 = origPixels(y - 1, x + 1);
+            auto p4 = origPixels(y, x - 1);
+            auto p5 = origPixels(y, x);
+            auto p6 = origPixels(y, x + 1);
+            auto p7 = origPixels(y + 1, x - 1);
+            auto p8 = origPixels(y + 1, x);
+            auto p9 = origPixels(y + 1, x + 1);
+            auto r = p1.r * mask[0] + p2.r * mask[1] + p3.r * mask[2] + p4.r * mask[3] + p5.r * mask[4] +
+                     p6.r * mask[5] + p7.r * mask[6] + p8.r * mask[7] + p9.r * mask[8];
+            auto g = p1.g * mask[0] + p2.g * mask[1] + p3.g * mask[2] + p4.g * mask[3] + p5.g * mask[4] +
+                     p6.g * mask[5] + p7.g * mask[6] + p8.g * mask[7] + p9.g * mask[8];
+            auto b = p1.b * mask[0] + p2.b * mask[1] + p3.b * mask[2] + p4.b * mask[3] + p5.b * mask[4] +
+                     p6.b * mask[5] + p7.b * mask[6] + p8.b * mask[7] + p9.b * mask[8];
+            pixels(y, x) = {ui8_clamp(r / modifier), ui8_clamp(g / modifier), ui8_clamp(b / modifier)};
+        }
+    }
+    return {pixels};
+}
+
 PixelArray::PixelArray(uint32_t width, uint32_t height) {
     this->_width = width;
     this->_height = height;
diff --git a/bmpimage.h b/bmpimage.h
index add6396..77de907 100644
--- a/bmpimage.h
+++ b/bmpimage.h
@@ -105,6 +105,8 @@ Pixel operator-(const Pixel &, const uint8_t &);
 
 Pixel operator-(const uint8_t &, const Pixel &);
 
+Pixel operator-(const Pixel &, const Pixel &);
+
 BMPImage grayscale(BMPImage &);
 
 BMPImage invertColors(BMPImage &);
@@ -115,7 +117,13 @@ BMPImage downscale2x(BMPImage &);
 
 BMPImage upscale1_5x(BMPImage &);
 
+BMPImage upscale1_5x_ver2(BMPImage &); // TODO: BAD
+
+BMPImage upscale2x_ver2(BMPImage &); // TODO: BAD
+
 BMPImage textImg(const std::u16string &, Font *font, uint8_t scale = 1, Pixel background_color = Pixel{0, 0, 0},
                  Pixel font_color = Pixel{255, 255, 255});
 
-uint8_t ui8_clamp(int value, uint8_t min = 0, uint8_t max = 255);
\ No newline at end of file
+uint8_t ui8_clamp(int value, uint8_t min = 0, uint8_t max = 255);
+
+BMPImage filter(BMPImage &img, int mask[9], uint8_t modifier = 9);
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index 8406632..d35987a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -34,34 +34,45 @@ void lab01() {
 //
 void lab02_01() {
     auto img = readBMPImage("../tea.bmp");
+    auto text1024 = textImg(u"1024", &font, 3);
+    auto text512 = textImg(u"512", &font, 3);
+    auto text256 = textImg(u"256", &font, 3);
+    auto text128 = textImg(u"128", &font, 3);
     auto img_512 = downscale2x(img);
     auto img_256 = downscale2x(img_512);
     auto img_128 = downscale2x(img_256);
-    img_512.save("../lab02/tea_512.bmp");
-    img_256.save("../lab02/tea_256.bmp");
-    img_128.save("../lab02/tea_128.bmp");
-    auto newImg = img.appendRight(img_512).appendRight(img_256).appendRight(img_128);
-    newImg.save("../lab02/tea_downscale.bmp");
-//    auto img_from_512 = upscale2x(img_512);
+    img_512.overlay(text512, 0, 0).save("../lab02/tea_512.bmp");
+    img_256.overlay(text256, 0, 0).save("../lab02/tea_256.bmp");
+    img_128.overlay(text128, 0, 0).save("../lab02/tea_128.bmp");
+    img.overlay(text1024, 0, 0).appendRight(img_512).overlay(text512, 1024, 0).appendRight(img_256).
+            overlay(text256, 1536, 0).appendRight(img_128).overlay(text128, 1792, 0).save(
+            "../lab02/tea_downscale.bmp");;
+    auto img_from_512 = upscale2x(img_512).overlay(text512, 0, 0);
 ////    auto img_from_256 = upscale2x(upscale2x(img_256));
 ////    auto img_from_128 = upscale2x(upscale2x(upscale2x(img_128)));
-//    auto tmp = upscale2x(img_256);
-//    auto img_from_256 = upscale2x(tmp);
-//    auto tmp2 = upscale2x(img_128);
-//    auto tmp3 = upscale2x(tmp2);
-//    auto img_from_128 = upscale2x(tmp3);
-//    img_from_512.save("../lab02/tea_from_512.bmp");
-//    img_from_256.save("../lab02/tea_from_256.bmp");
-//    img_from_128.save("../lab02/tea_from_128.bmp");
-//    img.appendRight(img_from_512)->appendRight(img_from_256)->appendRight(img_from_128)->save("../lab02/tea_upscale.bmp");
-////    newImg2->save("../lab02/tea_upscale.bmp");
+    auto tmp = upscale2x(img_256);
+    auto img_from_256 = upscale2x(tmp).overlay(text256, 0, 0);
+    auto tmp2 = upscale2x(img_128);
+    auto tmp3 = upscale2x(tmp2);
+    auto img_from_128 = upscale2x(tmp3).overlay(text128, 0, 0);
+    img_from_512.save("../lab02/tea_from_512.bmp");
+    img_from_256.save("../lab02/tea_from_256.bmp");
+    img_from_128.save("../lab02/tea_from_128.bmp");
+    img.overlay(text1024, 0, 0).appendRight(img_from_512).appendRight(img_from_256).appendRight(img_from_128).save(
+            "../lab02/tea_upscale.bmp");
+//    newImg2->save("../lab02/tea_upscale.bmp");
 }
 
 //
 void lab02_02() {
     auto img = readBMPImage("../tea.bmp");
+    auto ogText = textImg(u"Оригинал", &font, 3);
+    auto text256 = textImg(u"256 оттенков", &font, 3);
+    auto text128 = textImg(u"128 оттенков", &font, 3);
+    auto text64 = textImg(u"64 оттенка", &font, 3);
+    auto text32 = textImg(u"32 оттенка", &font, 3);
     auto gsImg = grayscale(img);
-    gsImg.save("../lab02/tea_grayscale_256.bmp");
+    gsImg.overlay(text256, 0, 0).save("../lab02/tea_grayscale_256.bmp");
     auto gsPixels = gsImg.pixels_copy();
     auto width = gsImg.width();
     auto height = gsImg.height();
@@ -70,39 +81,94 @@ void lab02_02() {
             gsPixels(i, j) = (gsPixels(i, j) / 2) * 2;
         }
     }
-    auto gsImg128 = BMPImage(gsPixels);
+    auto gsImg128 = BMPImage(gsPixels).overlay(text128, 0, 0);
     gsPixels = gsImg.pixels_copy();
     for (int i = 0; i < height; ++i) {
         for (int j = 0; j < width; ++j) {
             gsPixels(i, j) = (gsPixels(i, j) / 4) * 4;
         }
     }
-    auto gsImg64 = BMPImage(gsPixels);
+    auto gsImg64 = BMPImage(gsPixels).overlay(text64, 0, 0);
     gsPixels = gsImg.pixels_copy();
     for (int i = 0; i < height; ++i) {
         for (int j = 0; j < width; ++j) {
             gsPixels(i, j) = (gsPixels(i, j) / 8) * 8;
         }
     }
-    auto gsImg32 = BMPImage(gsPixels);
+    auto gsImg32 = BMPImage(gsPixels).overlay(text32, 0, 0);
     gsImg128.save("../lab02/tea_grayscale_128.bmp");
     gsImg64.save("../lab02/tea_grayscale_64.bmp");
     gsImg32.save("../lab02/tea_grayscale_32.bmp");
-    gsImg.appendRight(gsImg128).appendRight(gsImg64).appendRight(gsImg32).save("../lab02/tea_grayscale.bmp");
+    img.overlay(ogText, 0, 0).appendRight(gsImg).overlay(text256, 1024, 0).appendRight(gsImg128).appendRight(
+            gsImg64).appendRight(gsImg32).save("../lab02/tea_grayscale.bmp");
 }
 
 //
 void lab02_03() {
     auto img = readBMPImage("../tea.bmp");
+    auto text = textImg(u"Оригинал", &font, 3);
+    auto text_avrg = textImg(u"Среднее 1.5x", &font, 5);
+    auto text_avrg2 = textImg(u"Среднее 2x", &font, 6);
+    auto text_avrg3 = textImg(u"Среднее 3x", &font, 9);
+    auto text_lin = textImg(u"Линейное 1.5x", &font, 5);
+    auto text_lin2 = textImg(u"Линейное 2x", &font, 6);
+    auto text_lin3 = textImg(u"Линейное 3x", &font, 9);
     auto img_1_5 = upscale1_5x(img);
+    auto img_1_5_ver2 = upscale1_5x_ver2(img);
     auto img_2 = upscale2x(img);
+    auto img_2_ver2 = upscale2x_ver2(img);
     auto img_3 = upscale2x(img_1_5);
-    img_1_5.save("../lab02/lab02_03/tea_x1_5.bmp");
-    img_2.save("../lab02/lab02_03/tea_x2.bmp");
-    img_3.save("../lab02/lab02_03/tea_x3.bmp");
-    img.appendRight(img_1_5).appendRight(img_2).appendRight(img_3).save(
-            "../lab02/lab02_03/tea_upscale.bmp"); //.appendRight(img_3)
-//    img.appendRight(img_1_5).save("../lab02/lab02_03/tea_upscale.bmp");
+    auto img_3_ver2 = upscale2x_ver2(img_1_5_ver2);
+    img_1_5.overlay(text_avrg, 0, 0).appendRight(img_1_5_ver2).overlay(text_lin, 1536, 0).save(
+            "../lab02/lab02_03/tea_x1_5.bmp");
+    img_2.overlay(text_avrg2, 0, 0).appendRight(img_2_ver2).overlay(text_lin2, 2048, 0).save(
+            "../lab02/lab02_03/tea_x2.bmp");
+    img_3.overlay(text_avrg3, 0, 0).appendRight(img_3_ver2).overlay(text_lin3, 3072, 0).save(
+            "../lab02/lab02_03/tea_x3.bmp");
+    img.overlay(text, 0, 0).appendRight(img_1_5).overlay(text_avrg, 1024, 0).appendRight(img_2)
+            .overlay(text_avrg2, 2560, 0).appendRight(img_3).overlay(text_avrg3, 4608, 0).save(
+                    "../lab02/lab02_03/tea_upscale.bmp");
+    img.overlay(text, 0, 0).appendRight(img_1_5_ver2).overlay(text_lin, 1024, 0).appendRight(img_2_ver2)
+            .overlay(text_lin, 2560, 0).appendRight(img_3_ver2).overlay(text_lin, 4608, 0).save(
+                    "../lab02/lab02_03/tea_upscale_ver2.bmp");
+}
+
+void lab03() {
+    auto img = readBMPImage("../tea.bmp");
+    auto imgGS = grayscale(img);
+    int avrg_mask[9] = {1, 1, 1, 1, 1, 1, 1, 1, 1};
+    int previtt_mask1[9] = {-1, 0, 1, -1, 0, 1, -1, 0, 1};
+    int previtt_mask2[9] = {-1, -1, -1, 0, 0, 0, 1, 1, 1};
+    int sobel_mask1[9] = {-1, 0, 1, -2, 0, 2, -1, 0, 1};
+    int sobel_mask2[9] = {-1, -2, -1, 0, 0, 0, 1, 2, 1};
+    auto avrg_text = textImg(u"Осреднение", &font, 3);
+    auto previtt_text = textImg(u"Фильтр Превитта", &font, 3);
+    auto sobel_text = textImg(u"Фильтр Собеля", &font, 3);
+    auto text = textImg(u"Оригинал", &font, 3);
+    auto avrg_image = filter(imgGS, avrg_mask).overlay(avrg_text, 0, 0);
+    auto previtt_image1 = filter(imgGS, previtt_mask1, 1);//.overlay(previtt_text, 0, 0);
+    auto previtt_image2 = filter(imgGS, previtt_mask2, 1);//.overlay(previtt_text, 0, 0);
+    previtt_image1.save("../lab03/previtt1.bmp");
+    previtt_image2.save("../lab03/previtt2.bmp");
+    PixelArray previttPixels(previtt_image1.width(), previtt_image1.height());
+    for (int y = 0; y < previtt_image1.height(); ++y) {
+        for (int x = 0; x < previtt_image1.width(); ++x) {
+            previttPixels(y, x) = previtt_image1.pixels()(y, x) + previtt_image2.pixels()(y, x);
+        }
+    }
+    auto previtt_image = BMPImage(previttPixels).overlay(previtt_text, 0, 0);
+    auto sobel_image1 = filter(imgGS, sobel_mask1, 1).overlay(sobel_text, 0, 0);
+    auto sobel_image2 = filter(imgGS, sobel_mask2, 1).overlay(sobel_text, 0, 0);
+    PixelArray sobelPixels(sobel_image1.width(), sobel_image2.height());
+    for (int y = 0; y < sobel_image1.height(); ++y) {
+        for (int x = 0; x < sobel_image1.width(); ++x) {
+            previttPixels(y, x) = sobel_image1.pixels()(y, x) + sobel_image2.pixels()(y, x);
+        }
+    }
+    auto sobel_image = BMPImage(previttPixels).overlay(sobel_text, 0, 0);
+    imgGS.overlay(text, 0, 0).appendRight(avrg_image).save("../lab03/avrg_filter.bmp");
+    imgGS.overlay(text, 0, 0).appendRight(previtt_image).save("../lab03/previtt_filter.bmp");
+    imgGS.overlay(text, 0, 0).appendRight(sobel_image).save("../lab03/sobel_filter.bmp");
 }
 
 void test() {
@@ -123,7 +189,7 @@ void test() {
     test(2, 2) = Pixel{0, 0, 0};
     auto test_img = BMPImage(test);
     test_img.save("../test.bmp");
-    auto test_scale = upscale2x(test_img);
+    auto test_scale = upscale1_5x_ver2(test_img);
     test_scale.save("../test_scale.bmp");
 }
 
@@ -162,12 +228,14 @@ void test3() {
 }
 
 int main() {
-    lab01();
+    //lab01();
 //    lab02_01();
 //    lab02_02();
 //    lab02_03();
+    lab03();
 //    test();
 //    test2();
 //    test3();
+//    auto t = readBMPImage("../lab02/lab02_03/tea_x3.bmp");
     return 0;
 }