Just got a new Macbook Pro with Retina display, mid-2014 model. I had all the stuff imported from my previous MacBook Pro (2011 model) with Yosemite transferred onto this new computer. With my old computer, I could do Command +Shift + 4 to screencap any area I wanted, no problem. But now, the screencaps I take are bigger than I expected. For example, I noted that when I took an example screenshot, I took it at 255 (width) by 100 (height) px. When I open it up on Preview, it looks the same size as when I took the screenshot. But when I examine the dimensions in Tools --> Adjust Size... , it turns out to be 510 by 200 px, doubled in size. I first noticed this after I uploaded a screencapped image to a website, where the image was twice as big before. Said example: http://i.imgur.com/NQHe6H7.png Is there a way to change this? My internet browser (Google Chrome) was at a standard 100% in terms of zooming in/out when I took the screenshot, and I can't think of how else to research this problem. Downloading images from online has no effect on their size (after I confirm dimensions in Preview and uploading to a site), so I assume it's the screencapping function.