There are a few things you can do to help Photoshop unrasterize images. The first is to use the Unraster command. This command will remove all the lines and rid the image of any artifacts that may have been caused by rasterization. The second is to use the Pixelate command. This command will create a pixelated version of the image, which will help to improve its appearance. Finally, you can use the Levels command to adjust the brightness and color of each pixel in an image.
