School Portal Hesse: compare all school images with the inverted image

sph_images_inverted.js

const Jimp = require('jimp');

async function getSchools() {
    let response = await fetch("https://startcache.schulportal.hessen.de/exporteur.php?a=schoollist");
    let data = await response.json();

    let result = [];

    for (let i = 0; i < data.length; i++) {
        for (let j = 0; j < data[i].Schulen.length; j++) {
            result.push(data[i].Schulen[j].Id);
        }
        if (i === data.length - 1) {
            return result;
        }
    }

}


async function main() {
    let schoolIds = await getSchools();

    const totalSchools = schoolIds.length;
    let completedSchools = 0;

    for (let i = 0; i < schoolIds.length; i++) {
        const schoolID = schoolIds[i];

        // Load the original image using jimp
        const originalImage = await Jimp.read(`https://startcache.schulportal.hessen.de/exporteur.php?a=schoollogo&i=${schoolID}`);

        if (originalImage.getHeight() === 1) {
            completedSchools++;
            continue;
        }

        // Invert the colors
        const invertedImage = originalImage.clone().invert();

        // Create a new canvas to display both images side by side
        const canvasWidth = originalImage.getWidth() + invertedImage.getWidth() + 40; // Add padding
        const canvasHeight = Math.max(originalImage.getHeight(), invertedImage.getHeight()) + 20;
        const canvas = new Jimp(canvasWidth, canvasHeight, 0xfffbffff); // White background

        // Jimp has no function to fill a rectangle with a color.
        for (let x = 0; x < canvasWidth / 2; x++) {
            for (let y = 0; y < canvasHeight; y++) {
                canvas.setPixelColor(0x1d1b1eff, x + canvasWidth/2, y);
            }
        }

        // Composite the images onto the canvas
        canvas.composite(originalImage, 10, (canvasHeight - originalImage.getHeight()) / 2);
        canvas.composite(invertedImage, originalImage.getWidth() + 30, (canvasHeight - invertedImage.getHeight()) / 2);

        // Save the combined image to a file
        const filename = `outputs/${schoolID}.png`;
        await canvas.writeAsync(filename);

        completedSchools++;

        // Update progress bar
        const progress = (completedSchools / totalSchools) * 100;
        console.log(`Progress: ${progress.toFixed(2)}%`);
    }

    console.log('All school logos processed and saved.');
}

main();