350 lines
16 KiB
C
350 lines
16 KiB
C
#include "helpers.h"
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#include <math.h>
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#include <stdio.h>
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// Convert image to grayscale
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// The function grayscale takes three arguments: height and width, which are integers representing the dimensions of an image, and image, which is a two-dimensional array of type RGBTRIPLE representing the pixels of the image. The function converts the image to grayscale by setting the red, green, and blue components of each pixel to the mean of the original values. The result is stored back in the image array. The function uses nested loops to iterate over all pixels in the image. For each pixel, it calculates the mean of its red, green, and blue components using the formula (red + green + blue) / 3, and rounds the result to the nearest integer using the round function. Then it sets the red, green, and blue components of the pixel to the calculated mean. Finally, the function returns void, indicating that it does not return any value.
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void grayscale(int height, int width, RGBTRIPLE image[height][width])
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{
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for (int i = 0; i < height; i++)
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{
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for (int j = 0; j < width; j++)
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{
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int mean = (int) round((image[i][j].rgbtRed + image[i][j].rgbtGreen + image[i][j].rgbtBlue) / 3.0);
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image[i][j].rgbtRed = mean;
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image[i][j].rgbtGreen = mean;
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image[i][j].rgbtBlue = mean;
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}
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}
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return;
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}
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// Convert image to sepia
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void sepia(int height, int width, RGBTRIPLE image[height][width])
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{
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for (int i = 0; i < height; i++)
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{
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for (int j = 0; j < width; j++)
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{
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int sepiaRed = (int) round(.393 * image[i][j].rgbtRed + .769 * image[i][j].rgbtGreen + .189 * image[i][j].rgbtBlue) ;
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int sepiaGreen = (int) round(.349 * image[i][j].rgbtRed + .686 * image[i][j].rgbtGreen + .168 * image[i][j].rgbtBlue);
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int sepiaBlue = (int) round(.272 * image[i][j].rgbtRed + .534 * image[i][j].rgbtGreen + .131 * image[i][j].rgbtBlue);
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if (sepiaRed > 255)
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{
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sepiaRed = 255;
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}
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if (sepiaGreen > 255)
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{
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sepiaGreen = 255;
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}
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if (sepiaBlue > 255)
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{
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sepiaBlue = 255;
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}
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image[i][j].rgbtRed = sepiaRed;
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image[i][j].rgbtGreen = sepiaGreen;
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image[i][j].rgbtBlue = sepiaBlue;
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}
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}
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return;
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}
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// Reflect image horizontally
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void reflect(int height, int width, RGBTRIPLE image[height][width])
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{
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for (int i = 0; i < height; i++)
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{
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for (int j = 0; j < width / 2; j++)
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{
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RGBTRIPLE og = image[i][j];
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image[i][j] = image[i][width - 1 - j];
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image[i][width - 1 - j] = og;
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}
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}
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return;
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}
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// Blur image
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void blur(int height, int width, RGBTRIPLE image[height][width])
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{
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RGBTRIPLE og[height][width];
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for (int i = 0; i < height; i++)
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{
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for (int j = 0; j < width; j++)
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{
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og[i][j] = image[i][j];
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}
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}
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for (int i = 0; i < height; i++)
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{
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for (int j = 0; j < width; j++)
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{
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// inbetween
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if (i >= 1 && i < height - 1 && j >= 1 && j < width - 1)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i - 1][j - 1].rgbtRed +
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og[i - 1][j].rgbtRed +
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og[i - 1][j + 1].rgbtRed +
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og[i][j - 1].rgbtRed +
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og[i][j + 1].rgbtRed +
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og[i + 1][j - 1].rgbtRed +
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og[i + 1][j].rgbtRed +
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og[i + 1][j + 1].rgbtRed) / 9.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i - 1][j - 1].rgbtGreen +
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og[i - 1][j].rgbtGreen +
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og[i - 1][j + 1].rgbtGreen +
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og[i][j - 1].rgbtGreen +
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og[i][j + 1].rgbtGreen +
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og[i + 1][j - 1].rgbtGreen +
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og[i + 1][j].rgbtGreen +
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og[i + 1][j + 1].rgbtGreen) / 9.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i - 1][j - 1].rgbtBlue +
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og[i - 1][j].rgbtBlue +
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og[i - 1][j + 1].rgbtBlue +
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og[i][j - 1].rgbtBlue +
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og[i][j + 1].rgbtBlue +
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og[i + 1][j - 1].rgbtBlue +
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og[i + 1][j].rgbtBlue +
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og[i + 1][j + 1].rgbtBlue) / 9.0);
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}
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// Corners
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// upper left corner
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if (i == 0 && j == 0)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i][j + 1].rgbtRed +
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og[i + 1][j].rgbtRed +
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og[i + 1][j + 1].rgbtRed) / 4.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i][j + 1].rgbtGreen +
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og[i + 1][j].rgbtGreen +
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og[i + 1][j + 1].rgbtGreen) / 4.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i][j + 1].rgbtBlue +
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og[i + 1][j].rgbtBlue +
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og[i + 1][j + 1].rgbtBlue) / 4.0);
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}
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// upper right corner
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if (i == 0 && j == width - 1)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i][j - 1].rgbtRed +
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og[i + 1][j - 1].rgbtRed +
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og[i + 1][j].rgbtRed) / 4.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i][j - 1].rgbtGreen +
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og[i + 1][j - 1].rgbtGreen +
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og[i + 1][j].rgbtGreen) / 4.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i][j - 1].rgbtBlue +
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og[i + 1][j - 1].rgbtBlue +
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og[i + 1][j].rgbtBlue) / 4.0);
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}
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// lower left corner
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if (i == height - 1 && j == 0)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i - 1][j].rgbtRed +
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og[i - 1][j + 1].rgbtRed +
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og[i][j + 1].rgbtRed) / 4.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i - 1][j].rgbtGreen +
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og[i - 1][j + 1].rgbtGreen +
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og[i][j + 1].rgbtGreen) / 4.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i - 1][j].rgbtBlue +
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og[i - 1][j + 1].rgbtBlue +
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og[i][j + 1].rgbtBlue) / 4.0);
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}
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// lower right corner
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if (i == height - 1 && j == width - 1)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i - 1][j - 1].rgbtRed +
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og[i - 1][j].rgbtRed +
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og[i][j - 1].rgbtRed) / 4.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i - 1][j - 1].rgbtGreen +
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og[i - 1][j].rgbtGreen +
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og[i][j - 1].rgbtGreen) / 4.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i - 1][j - 1].rgbtBlue +
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og[i - 1][j].rgbtBlue +
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og[i][j - 1].rgbtBlue) / 4.0);
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}
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// Sides
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// Upper side
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if (i == 0 && j > 0 && j < width - 1)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i][j - 1].rgbtRed +
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og[i][j + 1].rgbtRed +
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og[i + 1][j - 1].rgbtRed +
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og[i + 1][j].rgbtRed +
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og[i + 1][j + 1].rgbtRed) / 6.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i][j - 1].rgbtGreen +
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og[i][j + 1].rgbtGreen +
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og[i + 1][j - 1].rgbtGreen +
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og[i + 1][j].rgbtGreen +
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og[i + 1][j + 1].rgbtGreen) / 6.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i][j - 1].rgbtBlue +
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og[i][j + 1].rgbtBlue +
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og[i + 1][j - 1].rgbtBlue +
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og[i + 1][j].rgbtBlue +
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og[i + 1][j + 1].rgbtBlue) / 6.0);
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}
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// lower side
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if (i == height - 1 && j > 0 && j < width - 1)
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{
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image[i][j].rgbtRed = (int)round((og[i][j].rgbtRed +
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og[i - 1][j - 1].rgbtRed +
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og[i - 1][j].rgbtRed +
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og[i - 1][j + 1].rgbtRed +
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og[i][j - 1].rgbtRed +
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og[i][j + 1].rgbtRed) / 6.0);
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image[i][j].rgbtGreen = (int)round((og[i][j].rgbtGreen +
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og[i - 1][j - 1].rgbtGreen +
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og[i - 1][j].rgbtGreen +
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og[i - 1][j + 1].rgbtGreen +
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og[i][j - 1].rgbtGreen +
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og[i][j + 1].rgbtGreen) / 6.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i - 1][j - 1].rgbtBlue +
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og[i - 1][j].rgbtBlue +
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og[i - 1][j + 1].rgbtBlue +
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og[i][j - 1].rgbtBlue +
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og[i][j + 1].rgbtBlue) / 6.0);
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}
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// left side
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if (i > 0 && i < height - 1 && j == 0)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i - 1][j].rgbtRed +
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og[i - 1][j + 1].rgbtRed +
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og[i][j + 1].rgbtRed +
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og[i + 1][j].rgbtRed +
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og[i + 1][j + 1].rgbtRed) / 6.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i - 1][j].rgbtGreen +
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og[i - 1][j + 1].rgbtGreen +
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og[i][j + 1].rgbtGreen +
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og[i + 1][j].rgbtGreen +
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og[i + 1][j + 1].rgbtGreen) / 6.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i - 1][j].rgbtBlue +
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og[i - 1][j + 1].rgbtBlue +
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og[i][j + 1].rgbtBlue +
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og[i + 1][j].rgbtBlue +
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og[i + 1][j + 1].rgbtBlue) / 6.0);
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}
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// right side
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if (i > 0 && i < height - 1 && j == width - 1)
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{
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image[i][j].rgbtRed = (int) round((og[i][j].rgbtRed +
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og[i - 1][j - 1].rgbtRed +
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og[i - 1][j].rgbtRed +
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og[i][j - 1].rgbtRed +
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og[i + 1][j - 1].rgbtRed +
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og[i + 1][j].rgbtRed) / 6.0);
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image[i][j].rgbtGreen = (int) round((og[i][j].rgbtGreen +
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og[i - 1][j - 1].rgbtGreen +
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og[i - 1][j].rgbtGreen + og[i][j - 1].rgbtGreen +
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og[i + 1][j - 1].rgbtGreen + og[i + 1][j].rgbtGreen) / 6.0);
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image[i][j].rgbtBlue = (int) round((og[i][j].rgbtBlue +
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og[i - 1][j - 1].rgbtBlue +
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og[i - 1][j].rgbtBlue +
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og[i][j - 1].rgbtBlue +
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og[i + 1][j - 1].rgbtBlue +
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og[i + 1][j].rgbtBlue) / 6.0);
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}
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}
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}
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return;
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}
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//00 = [i - 1][j - 1]
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//01 = [i - 1][j]
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//02 = [i - 1][j + 1]
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//10 = [i][j - 1]
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//12 = [i][j + 1]
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//20 = [i + 1][j - 1]
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//21 = [i + 1][j]
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//22 = [i + 1][j + 1]
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// Dazwischen
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//00 = [i - 1][j - 1]
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//01 = [i - 1][j]
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//02 = [i - 1][j + 1]
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//10 = [i][j - 1]
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//12 = [i][j + 1]
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//20 = [i + 1][j - 1]
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//21 = [i + 1][j]
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//22 = [i + 1][j + 1]
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//Ecke Links oben
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//12 [i][j + 1]
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//21 [i + 1][j]
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//22 [i + 1][j + 1]
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//Ecke Rechts oben
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//10 [i][j - 1]
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//20 [i + 1][j - 1]
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//21 [i + 1][j]
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//Ecke Links unten
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//01 [i - 1][j]
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//02 [i - 1][j + 1]
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//12 [i][j + 1]
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//Ecke Rechts unten
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//00 [i - 1][j - 1]
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//01 [i - 1][j]
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//10 [i][j - 1]
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// Seite oben
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//10 [i][j - 1]
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//12 [i][j + 1]
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//20 [i + 1][j - 1]
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//21 [i + 1][j]
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//22 [i + 1][j + 1]
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// Seite unten
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//00 [i - 1][j - 1]
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//01 [i - 1][j]
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//02 [i - 1][j + 1]
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//10 [i][j - 1]
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//12 [i][j + 1]
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// Seite links
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//01 [i - 1][j]
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//02 [i - 1][j + 1]
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//12 [i][j + 1]
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//21 [i + 1][j]
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//22 [i + 1][j + 1]
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// Seite rechts
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//00 [i - 1][j - 1]
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//01 [i - 1][j]
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//10 [i][j - 1]
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//20 [i + 1][j - 1]
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//21 [i + 1][j]
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