How is the Raw data used in iPhoto. I currently shoot both jpeg and raw and import them both into iPhoto.

How is the Raw data used in iPhoto? I currently shoot both jpeg and raw and import them both into iPhoto. What do I gain by collecting Raw data?
Thanks

You get more parameters for making adjustments to the image. This is not really an iPhoto question but more a general photography one. In rather simple terms here's how a digital camera works:
You expose an image. A lot of data is gathered in by the sensor. But it's just a bug lump of data and not very useful in that form.
In cameras that shoot jpeg that mass of data is interpreted/processed into an actual image, and the image is stored in a jpeg file. (that's a process broadly analogous to developing a film). The decisions that go into making that interpretation are all made by an engineer somewhere, back when the camera was developed.
If you shoot Raw, then what you do is take that mass of data, and rather than working to the decisions made by that engineer, you develop the shot - you run the digital darkroom.
Why would you do this? Take on all this extra work? Well one of three reasons: a: you think you can do a better job than that engineer. b: you just prefer the result you get when you develop yourself or c: you're a hopeless shooter and raw means you have more options to fix the mistakes you made in the camera. (That's why I do it.)
Here endeth the two dollar tour. So, basically, if you're happy with what your camera produces in Jpeg then there's really no need to shoot Raw.
There's no need at all to shoot Raw+Jpeg as iPhoto creates a jpeg preview when you import, so you're just wasting space.

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