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But what if it’s the size of the image – in terms of MB – you want to change? How to make an image smaller

That will change the dimensions of the image, perhaps you need the width to be the same as the width of a webpage you are adding the image to, for example. Adjust either the Width number or the Height number – the other will automatically adjust proportionally.Choose whether you want to resize according to pixels, percent, inches, cm, mm or points.This means you can only change one dimension, length or width, but it means everything will be adjusted equally.

Now, assuming want your image to look the same after – rather than stretched or squat, you need to make sure that Scale proportionally is selected.Choose Adjust Size (you can also open this menu by clicking on the square with arrows icon in the menu bar).Double click on the image – this should open the image in Preview, if it doesn’t, close it and right click to choose Open With and select Preview.Locate the image (either using the Finder, or on your Desktop).