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script.js
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script.js
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const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
const img = new Image();
const reader = new FileReader();
function uploadImage(e) {
reader.readAsDataURL(e.target.files[0]);
reader.onload = () => {
img.src = reader.result;
img.onload = () => {
canvas.width = img.width;
canvas.height = img.height;
ctx.drawImage(img, 0, 0);
};
}
}
function greyscale() {
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
const grey = data[i] * 0.21 + data[i + 1] * 0.71 + data[i + 2] * 0.07;
data[i] = grey;
data[i + 1] = grey;
data[i + 2] = grey
}
ctx.putImageData(imageData, 0, 0);
}
function sepia() {
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
const grey = data[i] * 0.21 + data[i + 1] * 0.71 + data[i + 2] * 0.07;
data[i] = grey + 95;
data[i + 1] = grey + 58;
data[i + 2] = grey;
}
ctx.putImageData(imageData, 0, 0);
}
function invert() {
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
data[i] = 255 - data[i];
data[i + 1] = 255 - data[i + 1];
data[i + 2] = 255 - data[i + 2];
}
ctx.putImageData(imageData, 0, 0);
}
function rbg() {
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
const green = data[i + 1];
const blue = data[i + 2];
data[i] = data[i];
data[i + 1] = blue;
data[i + 2] = green;
}
ctx.putImageData(imageData, 0, 0);
}
function bgr() {
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
const red = data[i];
const green = data[i + 1];
const blue = data[i + 2];
data[i] = blue;
data[i + 1] = green;
data[i + 2] = red;
}
ctx.putImageData(imageData, 0, 0);
}
function gbr() {
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
const red = data[i];
const green = data[i + 1];
const blue = data[i + 2];
data[i] = green;
data[i + 1] = blue;
data[i + 2] = red;
}
ctx.putImageData(imageData, 0, 0);
}
function grb() {
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
const data = imageData.data;
for(let i = 0; i < data.length; i += 4) {
const red = data[i];
const green = data[i + 1];
const blue = data[i + 2];
data[i] = green;
data[i + 1] = red;
data[i + 2] = blue;
}
ctx.putImageData(imageData, 0, 0);
}
function clearChanges() {
img.src = reader.result;
}
function download(){
const image = canvas.toDataURL();
const link = document.createElement("a");
link.href = image;
link.download = "image.png";
link.click();
}
const buttons = document.querySelectorAll("button");
buttons[0].addEventListener("click", greyscale);
buttons[1].addEventListener("click", sepia);
buttons[2].addEventListener("click", invert);
buttons[3].addEventListener("click", rbg);
buttons[4].addEventListener("click", bgr);
buttons[5].addEventListener("click", gbr);
buttons[6].addEventListener("click", grb);
buttons[7].addEventListener("click", clearChanges);
buttons[8].addEventListener("click", download);
const imageLoader = document.getElementById("uploader");
imageLoader.addEventListener("change", uploadImage);