CyberChef/src/core/operations/SharpenImage.mjs

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2019-03-12 17:24:43 +01:00
/**
* @author j433866 [j433866@gmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation";
import OperationError from "../errors/OperationError";
import { isImage } from "../lib/FileType";
import { toBase64 } from "../lib/Base64";
import jimp from "jimp";
/**
* Sharpen Image operation
*/
class SharpenImage extends Operation {
/**
* SharpenImage constructor
*/
constructor() {
super();
this.name = "Sharpen Image";
this.module = "Image";
this.description = "Sharpens an image (Unsharp mask)";
this.infoURL = "https://wikipedia.org/wiki/Unsharp_masking";
this.inputType = "byteArray";
this.outputType = "byteArray";
this.presentType = "html";
this.args = [
{
name: "Radius",
type: "number",
value: 2,
min: 1
},
{
name: "Amount",
type: "number",
value: 1,
min: 0,
step: 0.1
},
{
name: "Threshold",
type: "number",
value: 10,
min: 0,
max: 100
}
];
}
/**
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
async run(input, args) {
const [radius, amount, threshold] = args;
if (!isImage(input)){
throw new OperationError("Invalid file type.");
}
let image;
try {
image = await jimp.read(Buffer.from(input));
} catch (err) {
throw new OperationError(`Error loading image. (${err})`);
}
try {
if (ENVIRONMENT_IS_WORKER())
self.sendStatusMessage("Sharpening image... (Cloning image)");
const blurImage = image.clone();
const blurMask = image.clone();
if (ENVIRONMENT_IS_WORKER())
self.sendStatusMessage("Sharpening image... (Blurring cloned image)");
blurImage.gaussian(radius);
if (ENVIRONMENT_IS_WORKER())
self.sendStatusMessage("Sharpening image... (Creating unsharp mask)");
blurMask.scan(0, 0, blurMask.bitmap.width, blurMask.bitmap.height, function(x, y, idx) {
const blurRed = blurImage.bitmap.data[idx];
const blurGreen = blurImage.bitmap.data[idx + 1];
const blurBlue = blurImage.bitmap.data[idx + 2];
const normalRed = this.bitmap.data[idx];
const normalGreen = this.bitmap.data[idx + 1];
const normalBlue = this.bitmap.data[idx + 2];
// Subtract blurred pixel value from normal image
this.bitmap.data[idx] = (normalRed > blurRed) ? normalRed - blurRed : 0;
this.bitmap.data[idx + 1] = (normalGreen > blurGreen) ? normalGreen - blurGreen : 0;
this.bitmap.data[idx + 2] = (normalBlue > blurBlue) ? normalBlue - blurBlue : 0;
});
if (ENVIRONMENT_IS_WORKER())
self.sendStatusMessage("Sharpening image... (Merging with unsharp mask)");
image.scan(0, 0, image.bitmap.width, image.bitmap.height, function(x, y, idx) {
let maskRed = blurMask.bitmap.data[idx];
let maskGreen = blurMask.bitmap.data[idx + 1];
let maskBlue = blurMask.bitmap.data[idx + 2];
const normalRed = this.bitmap.data[idx];
const normalGreen = this.bitmap.data[idx + 1];
const normalBlue = this.bitmap.data[idx + 2];
// Calculate luminance
const maskLuminance = (0.2126 * maskRed + 0.7152 * maskGreen + 0.0722 * maskBlue);
const normalLuminance = (0.2126 * normalRed + 0.7152 * normalGreen + 0.0722 * normalBlue);
let luminanceDiff;
if (maskLuminance > normalLuminance) {
luminanceDiff = maskLuminance - normalLuminance;
} else {
luminanceDiff = normalLuminance - maskLuminance;
}
// Scale mask colours by amount
maskRed = maskRed * amount;
maskGreen = maskGreen * amount;
maskBlue = maskBlue * amount;
// Only change pixel value if the difference is higher than threshold
if ((luminanceDiff / 255) * 100 >= threshold) {
this.bitmap.data[idx] = (normalRed + maskRed) <= 255 ? normalRed + maskRed : 255;
this.bitmap.data[idx + 1] = (normalGreen + maskGreen) <= 255 ? normalGreen + maskGreen : 255;
this.bitmap.data[idx + 2] = (normalBlue + maskBlue) <= 255 ? normalBlue + maskBlue : 255;
}
});
const imageBuffer = await image.getBufferAsync(jimp.AUTO);
return [...imageBuffer];
} catch (err) {
throw new OperationError(`Error sharpening image. (${err})`);
}
}
/**
* Displays the sharpened image using HTML for web apps
* @param {byteArray} data
* @returns {html}
*/
present(data) {
if (!data.length) return "";
const type = isImage(data);
if (!type) {
throw new OperationError("Invalid image type.");
}
return `<img src="data:${type};base64,${toBase64(data)}">`;
}
}
export default SharpenImage;