image-utility-library/src/effects.js

A Node.js library for compressing, resizing, cropping, and applying effects to images.

// // Import Jimp namespace
// import * as Jimp from 'jimp';

// /**
//  * Apply advanced effects to an image.
//  * @param {Buffer} imageBuffer - Input image buffer.
//  * @param {String} effect - Effect to apply (grayscale, invert, sepia).
//  * @returns {Promise<Buffer>} - Image buffer with the applied effect.
//  */
// const applyEffects = async (imageBuffer, effect) => {
//   try {
//     // Validate inputs
//     if (!imageBuffer || !(imageBuffer instanceof Buffer)) {
//       throw new Error('Invalid image buffer provided.');
//     }
    
//     if (!effect || typeof effect !== 'string') {
//       throw new Error('Invalid effect type provided.');
//     }
    
//     // Read the image using Jimp
//     // When importing as a namespace, we access the read method this way
//     const image = await Jimp.default.read(imageBuffer);

//     // Apply the requested effect
//     switch (effect.toLowerCase()) {
//       case 'grayscale':
//         image.greyscale();
//         break;
//       case 'invert':
//         image.invert();
//         break;
//       case 'sepia':
//         if (typeof image.sepia === 'function') {
//           image.sepia();
//         } else {
//           // Manual sepia implementation as fallback
//           image.scan(0, 0, image.bitmap.width, image.bitmap.height, function(x, y, idx) {
//             const red = this.bitmap.data[idx + 0];
//             const green = this.bitmap.data[idx + 1];
//             const blue = this.bitmap.data[idx + 2];
            
//             const newRed = Math.min(255, (red * 0.393) + (green * 0.769) + (blue * 0.189));
//             const newGreen = Math.min(255, (red * 0.349) + (green * 0.686) + (blue * 0.168));
//             const newBlue = Math.min(255, (red * 0.272) + (green * 0.534) + (blue * 0.131));
            
//             this.bitmap.data[idx + 0] = newRed;
//             this.bitmap.data[idx + 1] = newGreen;
//             this.bitmap.data[idx + 2] = newBlue;
//           });
//         }
//         break;
//       default:
//         throw new Error(`Unsupported effect provided: ${effect}. Supported effects are: grayscale, invert, sepia.`);
//     }

//     // Use the constants correctly
//     return await new Promise((resolve, reject) => {
//       image.getBuffer(Jimp.default.MIME_PNG, (err, buffer) => {
//         if (err) reject(err);
//         else resolve(buffer);
//       });
//     });
//   } catch (error) {
//     console.error('Error applying effect:', error);
//     throw error;
//   }
// };

// export default applyEffects;