I got my 30D about a year ago, just a couple of days before a trip to Egypt . At first I started in jpeg mode because I was terrified of daring to even try raw, as there seems/seemed to be such a fear of it being far too difficult and needing a masters degree to make sense of it. I didn't want to risk ruining my holiday shots by trying this new and mythical beast. Well it didn't take long for curiosity to get the better of me and within two weeks I had switched to raw and have stayed with it ever since.
Raw is brilliant! If you do know what you're doing, when you fire the shutter, it will give you the best image possible. If you're inexperienced and don't set the camera up as well as you might for exposure and WB, contrast, saturation, sharpness etc. raw will allow you to correct your mistakes (within limits) far better than jpeg will.
When you shoot and edit raw files you preserve all the original image data and you can edit/save a thousand times and still return to the original data. When you shoot in jpeg you throw away subtle tonal information straight away in the camera and you lock in adjustments to the data (white balance, sharpness etc..) that can never be returned to the original captured data. If you edit and resave as a jpeg then you lose further detail as repeated file compression robs you of more data. I know some software, such as Lightroom, allows you to edit jpeg files non-destructively but you've already lost data when the camera saved the file as a jpeg and it is hard to recover blown highlights, for example, from a jpeg file.
I shot at a friend's wedding last year, about three months after I got the 30D and about three days after I got my flash gun. I had no idea what I was doing, regarding camera settings - well I thought I did but I got it wrong big time - and fortunately by shooting in raw I was able to correct a lot of my mistakes and salvage very acceptable images from what would have otherwise been a disaster.
Here is a before and after example of an original photo and the corrected version. This sort of correction would really not have been possible with a jpeg file, while retaining the original image quality. The edits were to boost exposure by +1.0, add some fill light and make a fairly large adjustment to white balance. I dare say it could be improved a little further but this is the photo as it stands today.
Here's a thread I started, follwoing this wedding, which shows more examples of how well a potential disaster, when shot in raw, can be easily corrected - https://photography-on-the.net/forum/showthread.php?t=286091
HOSTED PHOTO
please log in to view hosted photos in full size.
HOSTED PHOTO
please log in to view hosted photos in full size.