diff --git a/bmpimage.cpp b/bmpimage.cpp
index fe29d54..8156c9b 100644
--- a/bmpimage.cpp
+++ b/bmpimage.cpp
@@ -1,30 +1,35 @@
 #include "bmpimage.h"
 
-BMPImage::BMPImage(const BitmapFileHeader &fileHeader, const BITMAPINFOHEADER &infoHeader, Pixel **pixelArray) {
+BMPImage::BMPImage(const BitmapFileHeader &fileHeader, const BITMAPINFOHEADER &infoHeader, PixelArray pixelArray)
+        : pixelArray(pixelArray) {
     this->fileHeader = fileHeader;
     this->infoHeader = infoHeader;
-    this->pixelArray = pixelArray;
 }
 
+
+//BMPImage::BMPImage(const BitmapFileHeader &fileHeader, const BITMAPINFOHEADER &infoHeader, PixelArray pixelArray) {
+//
+//}
+
 const uint32_t &BMPImage::width() const { return this->infoHeader.BitmapWidth; }
 
 const uint32_t &BMPImage::height() const { return this->infoHeader.BitmapHeight; }
 
-void BMPImage::write(const std::string &filename) {
+void BMPImage::save(const std::string &filename) {
     {
         std::ofstream ofs(filename, std::ios_base::binary);
         ofs.write((char *) &this->fileHeader, sizeof(this->fileHeader));
         ofs.write((char *) &this->infoHeader, sizeof(this->infoHeader));
         uint32_t byteByRow = this->infoHeader.BitmapWidth * 3;
-        uint8_t padding = 4 - this->infoHeader.BitmapWidth % 4;
-        for (int i = 0; i < this->infoHeader.BitmapHeight; ++i) {
-            ofs.write((char *) pixelArray[i], byteByRow);
+        uint8_t padding = 4 - byteByRow % 4;
+        for (int i = this->infoHeader.BitmapHeight - 1; i > -1; --i) {
+            ofs.write((char *) pixelArray(i), byteByRow);
             if (padding != 4) ofs.write(PADDING_ZEROES, padding); // Write padding
         }
     }
 }
 
- Pixel **BMPImage::pixels(){
+const PixelArray BMPImage::pixels() {
     return this->pixelArray;
 }
 
@@ -33,7 +38,7 @@ Pixel **BMPImage::pixels_copy() {
     newPixelArray = new Pixel *[this->infoHeader.BitmapHeight];
     for (int i = 0; i < this->infoHeader.BitmapHeight; ++i) {
         newPixelArray[i] = new Pixel[this->infoHeader.BitmapWidth];
-        std::copy(this->pixelArray[i], this->pixelArray[i] + this->infoHeader.BitmapWidth, newPixelArray[i]);
+        std::copy(this->pixelArray(i), this->pixelArray(i) + this->infoHeader.BitmapWidth, newPixelArray[i]);
     }
     return newPixelArray;
 }
@@ -47,12 +52,45 @@ BITMAPINFOHEADER BMPImage::infoHeader_copy() {
 }
 
 BMPImage::~BMPImage() {
-    for (int i = 0; i < this->infoHeader.BitmapHeight; ++i) {
-        delete[] this->pixelArray[i];
-    }
-    delete[] this->pixelArray;
+//    delete pixelArray;
+//    for (int i = 0; i < this->infoHeader.BitmapHeight; ++i) {
+//        delete[] this->pixelArray(i);
+//    }
+//    delete[] this->pixelArray;
 }
 
+BMPImage::BMPImage(PixelArray pixelArray): pixelArray(pixelArray) {
+    uint32_t width = pixelArray.width();
+    uint32_t height = pixelArray.height();
+    BitmapFileHeader fileHeader;
+    BITMAPINFOHEADER infoHeader;
+    infoHeader.BitmapWidth = width;
+    infoHeader.BitmapHeight = height;
+    infoHeader.ImageSize = width * height * 3 + ((4 - width % 4) % 4) * height;
+    fileHeader.fileSize = infoHeader.ImageSize + fileHeader.imageDataOffset;
+    this->infoHeader = infoHeader;
+    this->fileHeader = fileHeader;
+//    this->pixelArray = pixelArray;
+}
+
+BMPImage *BMPImage::appendRight(const BMPImage &img) {
+    uint32_t newHeight = std::max(this->infoHeader.BitmapHeight, img.height());
+    uint32_t newWidth = this->infoHeader.BitmapWidth + img.width();
+//    Pixel **newPixelArray;
+    PixelArray newPixelArray(newWidth, newHeight);
+//    newPixelArray = new Pixel *[newHeight];
+    for (int i = 0; i < this->infoHeader.BitmapHeight; ++i) {
+//        newPixelArray[i] = new Pixel[newWidth];
+        std::copy(this->pixelArray(i), this->pixelArray(i) + this->infoHeader.BitmapWidth, newPixelArray(i));
+    }
+    for (int i = 0; i < img.height(); ++i) {
+        std::copy(img.pixels()(i), img.pixelArray(i) + img.width(), newPixelArray(i) + this->infoHeader.BitmapWidth);
+    }
+
+    return new BMPImage(newPixelArray);
+}
+
+
 BMPImage readBMPImage(const std::string &filename) {
     BitmapFileHeader bitmapFileHeader;
     BITMAPINFOHEADER bitmapInfoHeader;
@@ -86,8 +124,8 @@ BMPImage readBMPImage(const std::string &filename) {
         }
         ifs.seekg(bitmapFileHeader.imageDataOffset, std::ios::beg);
         uint32_t byteByRow = bitmapInfoHeader.BitmapWidth * 3;
-        uint8_t padding = 4 - bitmapInfoHeader.BitmapWidth % 4;
-        for (int i = 0; i < bitmapInfoHeader.BitmapHeight; ++i) {
+        uint8_t padding = 4 - byteByRow % 4;
+        for (int i = bitmapInfoHeader.BitmapHeight - 1; i > -1; --i) {
             pixelArray[i] = new Pixel[bitmapInfoHeader.BitmapWidth];
             ifs.read((char *) pixelArray[i], byteByRow);
             if (padding != 4) ifs.seekg(padding, std::ios_base::cur); // Skip padding
@@ -95,3 +133,182 @@ BMPImage readBMPImage(const std::string &filename) {
     }
     return {bitmapFileHeader, bitmapInfoHeader, pixelArray};
 }
+
+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;
+    return {r, g, b};
+}
+
+Pixel operator/(const Pixel &p1, const uint8_t &n) {
+    const uint8_t r = p1.r / n;
+    const uint8_t g = p1.g / n;
+    const uint8_t b = p1.b / n;
+    return {r, g, b};
+}
+
+BMPImage grayscale(BMPImage &img) {
+    auto pixels = img.pixels_copy();
+    for (int i = 0; i < img.height(); ++i) {
+        for (int j = 0; j < img.width(); ++j) {
+            uint8_t gray = pixels[i][j].r / 3 + pixels[i][j].g / 3 + pixels[i][j].b / 3;
+            pixels[i][j] = {gray, gray, gray};
+        }
+    }
+    return BMPImage(img.fileHeader_copy(), img.infoHeader_copy(), pixels);
+}
+
+Pixel operator*(const Pixel &p, const int &n) {
+    uint8_t r = ui8_clamp(n * p.r);
+    uint8_t g = ui8_clamp(n * p.g);
+    uint8_t b = ui8_clamp(n * p.b);
+    return {r, g, b};
+}
+
+uint8_t ui8_clamp(int value, uint8_t min, uint8_t max) {
+    if (value < min) {
+        return min;
+    }
+    if (value > max) {
+        return max;
+    }
+    return value;
+}
+
+BMPImage invertColors(BMPImage &img) {
+    auto pixels = img.pixels_copy();
+    for (int i = 0; i < img.height(); ++i) {
+        for (int j = 0; j < img.width(); ++j) {
+            pixels[i][j] = 255 - pixels[i][j];
+        }
+    }
+    return BMPImage(img.fileHeader_copy(), img.infoHeader_copy(), pixels);
+}
+
+Pixel operator-(const uint8_t &n, const Pixel &p) {
+    uint8_t r = ui8_clamp(n - p.r);
+    uint8_t g = ui8_clamp(n - p.g);
+    uint8_t b = ui8_clamp(n - p.b);
+    return {r, g, b};
+}
+
+Pixel operator-(const Pixel &p, const uint8_t &n) {
+    uint8_t r = ui8_clamp(p.r - n);
+    uint8_t g = ui8_clamp(p.g - n);
+    uint8_t b = ui8_clamp(p.b - n);
+    return {r, g, b};
+}
+
+BMPImage upscale2x(BMPImage &img) {
+    auto oldPixels = img.pixels();
+    Pixel **newPixelArray;
+    const uint32_t newHeight = img.height() * 2;
+    const uint32_t newWidth = img.width() * 2;
+    newPixelArray = new Pixel *[newHeight];
+    for (int i = 0; i < newHeight; i += 2) {
+        newPixelArray[i] = new Pixel[newWidth];
+        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) {
+        newPixelArray[i] = new Pixel[newWidth];
+        if (i == newHeight - 1)
+            for (int j = 0; j < newWidth; ++j) {
+                newPixelArray[i][j] = newPixelArray[i - 1][j] / 2;
+            }
+        else
+            for (int j = 0; j < newWidth; ++j) {
+                newPixelArray[i][j] = newPixelArray[i - 1][j] / 2 + newPixelArray[i + 1][j] / 2;
+            }
+    }
+    return BMPImage(newPixelArray, newWidth, newHeight);
+}
+
+BMPImage downscale2x(BMPImage &img) {
+    Pixel **newPixelArray;
+    auto oldPixels = img.pixels_copy();
+    const uint32_t newHeight = img.height() / 2;
+    const uint32_t newWidth = img.width() / 2;
+    newPixelArray = new Pixel *[newHeight];
+    for (int i = 0; i < newHeight; ++i) {
+        newPixelArray[i] = new Pixel[newWidth];
+        for (int j = 0; j < newWidth; ++j) {
+            newPixelArray[i][j] = oldPixels[i * 2][j * 2];
+        }
+    }
+    return BMPImage(newPixelArray, newWidth, newHeight);
+}
+
+BMPImage upscale1_5x(BMPImage &img) {
+    auto oldPixels = img.pixels();
+    Pixel **newPixelArray;
+    const uint32_t newHeight = img.height() * 3 / 2;
+    const uint32_t newWidth = img.width() * 3 / 2;
+    newPixelArray = new Pixel *[newHeight];
+    for (int i = 0; i < newHeight; ++i) {
+        newPixelArray[i] = new Pixel[newWidth];
+        if ((i + 1) % 3 == 0) continue;
+        for (int j = 0; j < newWidth; ++j) {
+            int oldi = i * 2 / 3;
+            int oldj = 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 = 0; j < newWidth; ++j) {
+                newPixelArray[i][j] = newPixelArray[i - 1][j] / 2 + newPixelArray[i + 1][j] / 2;
+            }
+    }
+    return BMPImage(newPixelArray, newWidth, newHeight);
+
+}
+
+PixelArray::PixelArray(uint32_t width, uint32_t height) {
+    this->_width = width;
+    this->_height = height;
+    this->array = new Pixel *[height];
+    for (int i = 0; i < height; ++i) {
+        this->array[i] = new Pixel[width];
+    }
+}
+
+Pixel PixelArray::operator()(const uint32_t &i, const uint32_t &j) {
+    return this->array[i][j];
+}
+
+PixelArray::~PixelArray() {
+    for (int i = 0; i < this->_height; ++i) {
+        delete[] this->array[i];
+    }
+    delete[] this->array;
+}
+
+PixelArray::PixelArray(const PixelArray &pA) {
+    this->_width = pA.width();
+    this->_height = pA.height();
+    this->array = pA.array;
+}
+
+Pixel* PixelArray::operator()(const uint32_t &i) {
+    return this->array[i];
+}
+
+const uint32_t &PixelArray::width() const { return this->_width; }
+const uint32_t &PixelArray::height() const { return this->_height; }
diff --git a/bmpimage.h b/bmpimage.h
index fa3bf76..543c3b7 100644
--- a/bmpimage.h
+++ b/bmpimage.h
@@ -8,21 +8,21 @@ const char PADDING_ZEROES[3] = {0, 0, 0};
 
 #pragma pack(push, 1)
 struct BitmapFileHeader {
-    char signature[2] = {0, 0};
+    char signature[2] = {'B', 'M'};
     uint32_t fileSize = 0;
     uint16_t reserved1 = 0;
     uint16_t reserved2 = 0;
-    uint32_t imageDataOffset = 0;
+    uint32_t imageDataOffset = 54;
 };
 #pragma pack(pop)
 
 #pragma pack(push, 1)
 struct BITMAPINFOHEADER {
-    uint32_t HeaderSize = 0;
+    uint32_t HeaderSize = 40;
     uint32_t BitmapWidth = 0;
     uint32_t BitmapHeight = 0;
-    uint16_t ColorPlanes = 0;
-    uint16_t BitsPerPixel = 0;
+    uint16_t ColorPlanes = 1;
+    uint16_t BitsPerPixel = 24;
     uint32_t CompressionMethod = 0;
     uint32_t ImageSize = 0;
     int32_t HorizontalPixelPerMetre = 0;
@@ -34,18 +34,39 @@ struct BITMAPINFOHEADER {
 
 #pragma pack(push, 1)
 struct Pixel {
-    uint8_t r = 0;
+    uint8_t r = 255;
     uint8_t g = 0;
-    uint8_t b = 0;
+    uint8_t b = 255;
 };
 #pragma pack(pop)
 
+class PixelArray{
+    Pixel **array;
+    uint32_t _width;
+    uint32_t _height;
+public:
+    PixelArray(uint32_t width, uint32_t height);
+    PixelArray(const PixelArray &);
+    ~PixelArray();
+
+    [[nodiscard]] const uint32_t &width() const;
+
+    [[nodiscard]] const uint32_t &height() const;
+
+//    Pixel operator()(const uint32_t &, const uint32_t &);
+//    Pixel* operator()(const uint32_t &);
+    Pixel operator()(const uint32_t &, const uint32_t &);
+    Pixel* operator()(const uint32_t &);
+};
+
 class BMPImage {
     BitmapFileHeader fileHeader;
     BITMAPINFOHEADER infoHeader;
-    Pixel **pixelArray;
+    PixelArray pixelArray;
 public:
-    BMPImage(const BitmapFileHeader &fileHeader, const BITMAPINFOHEADER &infoHeader, Pixel **pixelArray);
+    BMPImage(const BitmapFileHeader &fileHeader, const BITMAPINFOHEADER &infoHeader, PixelArray pixelArray);
+
+    BMPImage(PixelArray pixelArray);
 
     ~BMPImage();
 
@@ -53,7 +74,7 @@ public:
 
     [[nodiscard]] const uint32_t &height() const;
 
-    [[nodiscard]] Pixel **pixels();
+    [[nodiscard]] const PixelArray pixels();
 
     [[nodiscard]] Pixel **pixels_copy();
 
@@ -61,7 +82,31 @@ public:
 
     [[nodiscard]] BITMAPINFOHEADER infoHeader_copy();
 
-    void write(const std::string &);
+    void save(const std::string &);
+
+    BMPImage *appendRight(const BMPImage &);
 };
 
 BMPImage readBMPImage(const std::string &filename);
+
+Pixel operator/(const Pixel &, const uint8_t &);
+
+Pixel operator+(const Pixel &, const Pixel &);
+
+Pixel operator*(const Pixel &, const int &);
+
+Pixel operator-(const Pixel &, const uint8_t &);
+
+Pixel operator-(const uint8_t &, const Pixel &);
+
+BMPImage grayscale(BMPImage &);
+
+BMPImage invertColors(BMPImage &);
+
+BMPImage upscale2x(BMPImage &);
+
+BMPImage downscale2x(BMPImage &);
+
+BMPImage upscale1_5x(BMPImage &);
+
+uint8_t ui8_clamp(int value, uint8_t min = 0, uint8_t max = 255);
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index 8444d6c..d215a77 100644
--- a/main.cpp
+++ b/main.cpp
@@ -3,33 +3,119 @@
 
 const std::string FILENAME = "../elef.bmp";
 const std::string FILENAME_OUT = "../elef_out.bmp";
+//
+//void lab01() {
+//    auto og_image = readBMPImage("../elef.bmp");
+//    auto pixels1 = og_image.pixels_copy();
+//    auto pixels2 = og_image.pixels_copy();
+//    for (int i = 0; i < og_image.height(); ++i) {
+//        for (int j = 0; j < og_image.width(); ++j) {
+//            pixels1[i][j] = pixels1[i][j] / 2;
+//            pixels2[i][j] = pixels2[i][j] * 2;
+//        }
+//    }
+//    auto darkenImg = BMPImage(pixels1, og_image.width(), og_image.height());
+//    auto lighterImg = BMPImage(pixels2, og_image.width(), og_image.height());
+//    og_image.appendRight(lighterImg)->appendRight(darkenImg)->appendRight(invertColors(og_image))->appendRight(
+//            grayscale(og_image))->save("../lab01/elef1.bmp");
+//}
+//
+//void lab02_01() {
+//    auto img = readBMPImage("../tea.bmp");
+//    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);
+////    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");
+//}
+//
+//void lab02_02() {
+//    auto img = readBMPImage("../tea.bmp");
+//    auto gsImg = grayscale(img);
+//    gsImg.save("../lab02/tea_grayscale_256.bmp");
+//    auto gsPixels = gsImg.pixels_copy();
+//    auto width = gsImg.width();
+//    auto height = gsImg.height();
+//    for (int i = 0; i < height; ++i) {
+//        for (int j = 0; j < width; ++j) {
+//            gsPixels[i][j] = (gsPixels[i][j] / 2) * 2;
+//        }
+//    }
+//    auto gsImg128 = BMPImage(gsPixels, width, height);
+//    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, width, height);
+//    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, width, height);
+//    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");
+//}
+//
+//void lab02_03(){
+//    auto img = readBMPImage("../tea.bmp");
+//    auto img_1_5 = upscale1_5x(img);
+//    auto img_2 = upscale2x(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");
+//    img.appendRight(img_1_5)->save("../lab02/lab02_03/tea_upscale.bmp");
+//}
 
-void lab01() {
-    auto og_image = readBMPImage(FILENAME);
-    auto pixels = og_image.pixels_copy();
-    for (int i = 0; i < og_image.height(); ++i) {
-        for (int j = 0; j < og_image.width(); ++j) {
-            uint8_t gray = pixels[i][j].r / 3 + pixels[i][j].g / 3 + pixels[i][j].b / 3;
-            pixels[i][j] = {gray, gray, gray};
-        }
-    }
-    auto image1 = new BMPImage(og_image.fileHeader_copy(), og_image.infoHeader_copy(), pixels);
-    auto pixels2 = image1->pixels_copy();
-    for (int i = 0; i < og_image.height(); ++i) {
-        for (int j = 0; j < og_image.width(); ++j) {
-            uint8_t gray = 0;
-            if (pixels2[i][j].r > 80) gray = 255;
-            pixels2[i][j] = {gray, gray, gray};
-        }
-    }
-    auto image2 = new BMPImage(og_image.fileHeader_copy(), og_image.infoHeader_copy(), pixels2);
-    image1->write("../elef_gs.bmp");
-    image2->write("../elef_bw.bmp");
-    og_image.write("../elef_out.bmp");
-//    image.write(FILENAME_OUT);
+void test() {
+    Pixel **test;
+    test = new Pixel *[3];
+    test[0] = new Pixel[3];
+    test[1] = new Pixel[3];
+    test[2] = new Pixel[3];
+    test[0][0] = Pixel{0, 0, 0};
+    test[0][1] = Pixel{127, 127, 127};
+    test[0][2] = Pixel{255, 255, 255};
+    test[1][0] = Pixel{127, 127, 127};
+    test[1][1] = Pixel{63, 63, 63};
+    test[1][2] = Pixel{127, 127, 127};
+    test[2][0] = Pixel{255, 255, 255};
+    test[2][1] = Pixel{127, 127, 127};
+    test[2][2] = Pixel{0, 0, 0};
+    auto test_img = BMPImage(test, 3, 3);
+    test_img.save("../test.bmp");
+    auto test_scale = upscale2x(test_img);
+    test_scale.save("../test_scale.bmp");
 }
 
 int main() {
-    lab01();
+    //lab01();
+    //lab02_01();
+    //lab02_02();
+//    lab02_03();
+    test();
     return 0;
 }
diff --git a/tea.bmp b/tea.bmp
new file mode 100644
index 0000000..01c78a5
Binary files /dev/null and b/tea.bmp differ