First, I need to confirm what Neat Image is. Neat Image is a noise reduction plugin for Photoshop. It's often used by photographers to reduce digital noise in their images. The user might want information on how to get it for Photoshop CS3, including a 2021 crack version. However, providing or promoting software cracks is illegal and against the guidelines. So I should be careful here. The user might not realize that they're asking for something that's against the law.