As far as Mac photo editing software goes, you should be able to find a basic editing program for under $100, typically starting for as little as $30. Paying more than $100 will often land you a professional editing program with additional editing tools and presets compared to the basic versions.
Using the Core Image filters of Mac OS X together with Quartz Compositions for additional special effects, provides a free way for Mac users to produce enhanced images. In addition to these filters, users can get more creative with the images by utilizing the program's tools for adjusting colors, image distortion, and modification of shape and perspective. It also has the ability to generate random images that can be used for all kinds of desktop publishing projects like web design, business cards and all kinds of print materials. All of these features can be utilized through a clean and easy to use user interface. Pixen can handle all kinds of image editing tasks from the simple to the complicated. It is however optimized for use in creating low-resolution images, which is perfect for people who usually work on icons and pixel art. It has a smart color palette swapping feature that makes manipulating both foreground and background imagery easy and efficient.
It may be focused on pixel-based images, but it can also handle more sophisticated photo editing. For image conversion, is a free tool that is a must-have for people who usually work with all kinds of image formats. It can support import and export tasks for about 80 image formats, including the import of images from scanners and cameras. Aside from these key features, GraphicConverter also has capabilities for batch conversion, image browsing, AppleScript support, slideshow generation and basic to advanced image editing tools. It also has a plug-in architecture that lets you install plug-ins that provide additional functionality if you want more sophisticated and complicated features for image editing and management. This image editor can function as a basic image management tool or as a high performance image editing tool.
As a non-destructive image editing software, gives users the chance to play around with its editing tools, including filters and other special effects, without destroying the original image. This means the user does not have to worry about losing the original image even if they have applied a lot of effects and modification to the image. The changes applied will remain visible but they do not actually get applied until the user saves the changes. This is a perfect training tool for people who are just getting started with photo editing. They can practice and develop their skills without the threat of losing their original images. It is a lightweight program, which means anyone can install and launch it quickly and easily. We can't talk about free photo editing software for Mac machines without talking about.
GIMP is the most popular, most trusted and most widely used free software of its kind on the Mac. Its features rival those of paid applications, so you are assured that it is very powerful. 
It supports basic image editing tasks as well as complex image enhancements, so it is a very versatile piece of software. Whether you are a casual user or a professional designer or artist, GIMP is always a reliable tool for image editing.
References https://www.gimp.org/features/.
Top 4 Download periodically updates software information of photo editing software for mac full versions from the publishers, but some information may be slightly out-of-date. Using warez version, crack, warez passwords, patches, serial numbers, registration codes, key generator, pirate key, keymaker or keygen for photo editing software for mac license key is illegal. Download links are directly from our mirrors or publisher's website, photo editing software for mac torrent files or shared files from free file sharing and free upload services, including Rapidshare, MegaUpload, YouSendIt, Letitbit, DropSend, MediaMax, HellShare, HotFile, FileServe, LeapFile, MyOtherDrive or MediaFire, are not allowed! Your computer will be at risk getting infected with spyware, adware, viruses, worms, trojan horses, dialers, etc while you are searching and browsing these illegal sites which distribute a so called keygen, key generator, pirate key, serial number, warez full version or crack for photo editing software for mac. These infections might corrupt your computer installation or breach your privacy. Photo editing software for mac keygen or key generator might contain a trojan horse opening a backdoor on your computer.