I will say right up front that I used it for about five minutes. I made an "Album" with a mix of raw, DNG, JPEG and TIFF files. I could "edit" a raw file - but that simply means that I could use the ham-handed minimal controls that are provided and the image would change. It is puzzling that a raw file does not expose more controls commensurate with editing a raw file. For example, there is no white balance control, just a "cast" slider. The interface is horrible - you do not see any file information, including the file name, displayed under, around or across the title bar - you need to open a floating "info" window just to know what file type, for example, you are looking at and editing.
What a mess - they basically made the iPhone/iPad Photos app into a desktop app. Nothing like telling your users you're too dumb to deserve better by foisting this crap on them, and abandoning the professional Aperture application. I don't really even use Aperture all that much and it makes me disappointed; however, I've used Macs since the late 80's and I have watched the steady decline of quality pro-level software and thoughtful OS design into a morass of bug-laden, dumbed down iDevice driven garbage with despair.
Here is the TechCrunch review of Photos:
After reading it, you will realize that Photos is for people who like to take photos with their devices and not for photographers who demand a professional application. I could see the introduction of Photos as a revamp of iPhoto being a step in the right direction for the casual user, IF APPLE CONTINUED to improve and develop Aperture in parallel for professional and advanced amateur users who demand and expect more. It appears that once Steve Jobs died, Apple marketing people and thought leaders steered the ship on a completely different tack.
If you are into photography and image editing, you will be offended when you open Photos and try to use it.
Luckily we Mac users have many choices in the raw converter department. Time to move on.
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