Image upscaling can be done using Real-ESRGAN, a super-resolution algorithm. Super-resolution is the process of increasing the resolution of the image.
Real-ESRGAN provides Linux, Windows and MacOS executable files and models for Intel/AMD/Nvidia GPUs.
The snippet below demonstrates bulk image upscaling with scale factor 4 and using the realesrgan-x4plus-anime model.
(async () => {
const inputDirectory = path.resolve(path.join(__dirname, 'pictures'));
const outputDirectory = path.resolve(
path.join(__dirname, 'pictures_upscaled')
);
const modelsPath = path.resolve(path.join(__dirname, 'resources', 'models'));
const execName = 'realesrgan-ncnn-vulkan';
const execPath = path.resolve(
path.join(__dirname, 'resources', getPlatform(), 'bin', execName)
);
const scaleFactor = 4;
const modelName = 'realesrgan-x4plus-anime';
if (!fs.existsSync(outputDirectory)) {
await fs.promises.mkdir(outputDirectory, { recursive: true });
}
const commands = [
'-i',
inputDirectory,
'-o',
outputDirectory,
'-s',
scaleFactor,
'-m',
modelsPath,
'-n',
modelName
];
const upscaler = spawn(execPath, commands, {
cwd: undefined,
detached: false
});
upscaler.stderr.on('data', (data) => {
console.log(data.toString());
});
await timers.setTimeout(600 * 1000);
})();
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