Copy over the second one into the first one.It supports layers, filters, channels and supports almost all image formats, plus it has better image / layer selection and resizing tools that may be better suited for your image editing needs. It has better tools much on the lines of popular editors (including shortcuts) and I guess if you try you should be doing just fine without much help from us. Speaking of free GUI tools, Seashore app is an open source project much better at working with images than Preview.app. * Keep this as a Template size, with any others, clearly labelled with their dimensions for future use. Menu > File > Save As… > New name > Whatever file format you want You can scale them by dragging their handles, and nudge them a pixel at a time with your cursor keys.

Switch to your blank background image, command v (Paste) each in turn dragging them into position next to each other. Select each of your two images in turn and go command a (Select All) and command c (Copy) Double click on this along with your two existing images to open them in Preview. Make a screensnap: command shift 4 > drag out an area 640 x428 Not strictly necessary but makes life easier.

Open up any Application that lets you have a clean neat whiteīackground.

How to do this with the tools to hand: Preview. I used it on and now the correct code is convert +append a.png b.jpg +append c.tif Alternatively, you could put this in some sort of automator script. This isn't a GUI application, but maybe some others might have a better solution. For example, you can switch to a different image format for the output convert +append a.png b.jpg c.tif With convert, you can do a ton of other things. Alternatively, you append them vertically with -append (instead of +) and a.png will be on top of b.png. To create a new file, c.png, that has the a.png on the left and b.png on the right. If you have your two 320x428 images, say a.png and b.png, you can do convert +append a.png b.png c.png The actual tool you want to use from Imagemagick is the convert tool. You could also choose to install with brew ( brew install imagemagick). I use the command line tools that come in the Imagemagick package I think I installed it on my system with MacPorts. I often have to do this with images of plots of data.

How to crop images on a mac