I've been playing with all the options on the 30D, and today tried RAW+JPEG to see if it is useful. I didn't like the images it produced, but something interesting did come of it: an exercise in highlight recovery.

The whales were having a tea party on the deck and to record the event I shot one frame of RAW+JPEG. I imported the images and accessed the JPEG sister by control-clicking on an image and selecting New Version from Master JPEG:

Here is a part of the JPEG version:

It's not sharp and I don't like the colors. But I can see detail in the white fin on the left. Now here is the RAW as processed by Aperture:

Sharper and nicer, but the fin is blow out. The blown out pixels are on the right of the histogram:

The JPEG version doesn't have this, so I know it's not inherent in the image:

How do I get the fin back? And why did Aperture do this to me?

First I turn the exposure way down. That brings the highlights back, but it kills the rest of the image. So I move the brightness and saturation up to compensate and then twiddle with the contrast to get a reasonable image with some loss of shadow detail:
Finally I get the shadows back with the Highlights and Shadows control:

And my final result is pretty pleasing:

The bucket is much better and the yellow color can be seen reflecting in other objects. The fin is how I want it, but the rest of the whale is visible too. The histogram looks entirely different now I have finished:

I wonder why this is so hard to do? Did I just use the wrong technique, or is there something missing from Aperture here?

Tags: RAW, Aperture, JPEG, Highlights, Canon, 30D