onto that Hard Drive.
When files are deleted, and the trash can emptied, the files do not actually go away. Instead, the space that they occupy on the disk is marked as "available" and can be reused by the system when it needs to.
Of course the easiest way to recover those photo's is to use your Time Machine backup to restore the missing items.
And, because I know that you are going to say that you have no Time Machine backup, you will need to look around for File Recovery programs for the Mac. Most of them have a Free Trial period so you can download and run them and see which one actually finds your Photo's, then buy it.
Remember, you only lose what you do not backup. If your photo's are "irreplaceable" you should take care of them.
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Deleted some photos by mistakenly and emptied the Trash, can I get these photos back ? Mine is an iMac 21' with macOS High Sierra. Can anyone help me ?