MacPorts requires an appropriate version of xcode xcode_5.1.1.dmg is the most recent version for Mavericks and Mountain Lion, and will require registering for free as an Apple Developer. If you're looking for a mature package management solution, for OS X I recommend MacPorts. I've included instructions below on how to install the GIMP using MacPorts. If you know Adobe Photoshop well, you may want to demo using GIMPshop, which very cleverly and conveniently reconstructs the look and feel of the GIMP to appear and behave nearly just like Photoshop. The GIMP can be installed manually, or built from source using MacPorts.
I've included step by step instructions for installing MacPorts and darktable below.Īnother extremely powerful alternative suggested in another response (I thank you Ecnerwal!) is using the GIMP. It manages your digital negatives in a database, lets you view them through a zoomable lighttable and enables you to develop raw images and enhance them."ĭarktable can be installed manually, but is also maintained as a port using MacPorts, if you prefer to use package management. A virtual lighttable and darkroom for photographers.
"is an open source photography workflow application and RAW developer. I personally would not recommend using Mac App Store -), but it isĪlternatively, for an application far more powerful than either Preview or photo crop Pro, I've discovered darktable, which You may want to demo using an application dedicated to exactly what you want to do (rather than seeking functionality that just isn't there from such a simple, although often very useful, application such as Preview.app), for example, In the end and in all circumstances, in my experience, mathematics is simply inescapable. Otherwise, you'll have to figure out those dimensions beforehand or one at a time, and manually try to match up the numbers. know if the numbers showing are multiples of your desired aspect ratio) and have a steady hand, you can accomplish what you are asking for on the fly. Not what you asked for, but when using the select tool, you will notice numbers at 2 of the corners of the select box, and if you're very good with math (i.e. Using the Adjust Size function in the Tools menu retains the aspect ratio by default. After creating the size of the select box that you want, you can use command-K to crop. Holding down the shift key while using the select tool will force the select box to retain itself in square dimensions, while holding down the option key will open the select box from the center of where you begin your selection, while holding down both shift and option keys will implement both these features simultaneously. There is no way to do exactly what you are specifying in Preview.app without doing a bit of math.
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