Terminal can help you perfectly flip your image either you want to flip it horizontally or vertically. Of course, you can flip diagonally also, by flipping horizontally after the image flipped vertically.
You can save a lot of time and Mac memory while performing this image manipulation. It's just a line of code so you don't need to spend much time to write the code for flipping image. And you don't need to open image editing Application that, of course, eat up a lot of memory of your Mac, all you need is only Terminal (including your keyboard and a little skill).
And this is the code..
convert [image name] -flip [new image name]
convert [image-name] -flop [new-image-name]
cdto the destined directory or by opening that directory in Finder and use OpenTerminalHere.
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