Function processJpeg

optimize.js:163–191

({ fileBuffer, config, isLossless })

}

async function processJpeg({ fileBuffer, config, isLossless }) {
	const sharpImage = sharp(fileBuffer)
		.rotate(); // Rotate image using information from EXIF Orientation tag

	if (!isLossless) {
		return sharpImage
			.jpeg(config?.jpeg?.lossy || {})
			.toBuffer();
	}

	const inputBuffer = await sharpImage
		.toColorspace('srgb') // Replace colorspace (guetzli works only with sRGB)
		.jpeg({ quality: 100, optimizeCoding: false }) // Applying maximum quality to minimize losses during image processing with sharp
		.toBuffer();

	const commandOptions = [
		...optionsToArguments({
			options: config?.jpeg?.lossless || {},
		}),
		'-',
		'-',
	];

	return pipe({
		command: guetzli,
		commandOptions,
		inputBuffer,
	});
}

function processPng({ fileBuffer, config, isLossless }) {
	return sharp(fileBuffer)