Here are some tips for image editing for web usage:
- Use JPEG file format for photos
- Optimize file size - no larger than 500KB per image
- Resize images to around 1000 pixels on the long side for high resolution displays
- Compress and optimize images without losing too much quality
- Remove backgrounds or excess whitespace
- Adjust brightness, contrast and color balance if needed
- Add watermarks or logos if desired
- Save optimized copies of images for web use