If you want to scrape an image or a file from a website (and save it to HDD) you shoud use DOWNLOADFILE macro with image URL in it. Place this macro to output template editor.
How to scrape images from an online store or a gallery
Set scrape sections to get image or images URL and put this scrape section macro to output template editor then place it to DOWNLOADFILE macro.
Then make preview to see how image(s) has been downloaded.
To download all product images from an online store webpage use iterative scrape section and put DOWNLOADFILE macro to iterative scrape sections settings (ctrl+5).
To set downloaded images file names use DFN macro (place it before DOWNLOADFILE macro).
How to scrape images from website articles
If you want to scrape images from HTML tags img or a you dont need use DOWNLOADFILE macro. Just place scrape section macro with HTML in to output template editor and turn on this option.