Hello, I'm new to Mac and I'm desperate for help. I opened my SDHC card and was looking at one photo. Then I resized it. Then I accidentally closed Preview before Save as another version. There was no asking for confirmation and the original file was downsized from 7MB to 200Kb. I tried to press Command Z but it was too late. I'm not sure how I can recover my original image back. Thank you very much for your help.