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trying to compare raw & jpeg images
Am able to view raw and jpeg side by side but don't see any significant difference.am I missing something?is there a significant difference when viewing on monitor?.

Am using canpn's zoombrowser.

Just starting to shoot raw...

Comments (9)

Of course this is an EXTREMELY simple explanation..

Raw gives you the ability to do far more 'adjusting' of your photos than jpg. You are unlikely to see much difference in a side by side comparison if you haven't done any adjusting to the raw. Here's how it works..

All cameras capture images in raw. ALL. To make a jpg photo, your camera looks at the settings either built into your camera or what you have set them to. It then adjusts the photo according to the settings and writes the raw image as a jpg to your memory card throwing away any data that doesn't contribute to making the final jpg image. Any subsequent adjusting of the jpg is limited because so much of the image has been tossed. And that is why jpg files are smaller than raw files..

By saving as a raw file, you avoid throwing away any data. The camera may well make the same adjustments to the raw file that it does to the jpg file (which probably accounts for the similarities between your raw and jpg). but even if it doesn't, and you have to make the adjustments manually, you have greater freedom to adjust beyond the limits of your jpg settings..

If you are happy with your jpg images and do not intend to do any significant alteration of them after capture there is no reason to shoot raw..

STOP Global Stasis! Change is good!.

Now that you've judged the quality of my typing, take a look at my photos..http://www.photo.net/photos/GlenBarrington..

Comment #1

First - I like your work glen..

Ok, can someone show me a jpeg/raw image where significant alteration has been done..

Am glad to finally know that unless image has been altered both are gonna look pretty much the same..

Other than contrast, brightness and cropping I have not needed to adjust my images.or maybe i'm not aware of what else can be to in terms of adjustments.i have done those adjustments in picasa, not photoshop..

I have also adjusted images in microsoft office picture manager. seems like you can do more there than in picasa...

Comment #2

When the camera saves the raw file, the camera setting are written into the header (not actually applied to the image). Many raw viewers can read those settings and apply them to the image, so what you see is what your jpg would have looked like had you made a jpg instead..

But since the settings were not actually applied to the data, you are free to make any changes you want to the settings and get a new version of the image, based on the full data off the sensor, without harming or altering the original data in any way..

Additionally, the jpg format is a lossy format. That means that some data is simply thrown away when the image is created. Lost forever, so no amount of post processing can recover it..

The raw data from your camera is in 10, 12 or 14 bits, while the jpg format is only 8 bits. Again more data loss in going from raw to jpg..

By shooting raw and making the adjustments you want, you have better control over the final image..

The greatest of mankind's criminals are those who delude themselves into thinking they have done 'the right thing.'- Rayna Butler..

Comment #3

Harveyabc wrote:.

First - I like your work glen..

Ok, can someone show me a jpeg/raw image where significant alterationhas been done.am glad to finally know that unless image has been altered both aregonna look pretty much the same..

Yes, so if you get it right in the camera, you pretty much won't need to do more than that..

Other than contrast, brightness and cropping I have not needed toadjust my images..

Great! That's how it should be..

Or maybe i'm not aware of what else can be to in terms of adjustments.i have done those adjustments in picasa, not photoshop..

Color balance is one area where the difference between jpeg and raw can be easily seen. A jpeg that is way out of color balance when adjusted to be correct will often end up with color banding because of the lack of bit depth (8bits) while the raw image will be smooth.Large adjustments in contrast and brightness have similar effects.If all your adjustments are small there is minimal advantage to raw..

You don't need Photoshop to do adjustments where raw has an advantage. Photoshop Elements is sufficient or other good photomanglers like Picture Window Pro or Paint Shop Pro, as long as it performs the photomanipulation in 16bit.Or try downloading trials of Lightroom or Lightzone..

I have also adjusted images in microsoft office picture manager.seems like you can do more there than in picasa..

I am unsure if either is a 16bit editor..

A member of the rabble in good standing...

Comment #4

Harveyabc wrote:.

Other than contrast, brightness and cropping I have not needed toadjust my images.or maybe i'm not aware of what else can be to in terms of adjustments.i have done those adjustments in picasa, not photoshop..

I have also adjusted images in microsoft office picture manager.seems like you can do more there than in picasa..

Zoombrowser has a surprisingly powerful set of editing tools, including a better implementation of Curves than Photoshop Elements has. What it does not have is any instructions on how to use them. Read the photoediting chapters in a "For dummies" type book on digital photography. Then play around with Levels, Curves and Unsharp Mask on your photos (remember to save your editing as a new file, NEVER alter your original file.) If you like the results, then think about getting PS Elements and a more comprehensive book on using it. (Scott Kelby's _Photoshop Elements 5 book for digital photographers_ is very good, but there are lots of titles out there.).

WillWill PrattBarrick Museum, UNLV..

Comment #5

Thanks for all the very valuable feedback. much food for thought...

Comment #6

Has an aticle that does the exact side by side comparison that you are looking for.STOP Global Stasis! Change is good!.

Now that you've judged the quality of my typing, take a look at my photos..http://www.photo.net/photos/GlenBarrington..

Comment #7

A raw file is like a negative. You can process it over and over again without losing any of the original detail. It's possible to process a raw file to bring out the sky (save it as a "Sky" image, this can be a jpg or tiff file) , then reprocess it to bring out the middle ground or foreground then merge the "Sky", "Middle" and/or "Foreground" images together to create a more balanced shot than what can be done on a jpg file..

Mark Johnson at "The Radiant Vista" website has a workbench on processing a raw file this week "4th October" which doesn't show what I've described above but does show the versatility of a raw file.http://www.radiantvista.com/workbench.

Http://www.pbase.com/carrhighlander..

Comment #8

I just wanted to add a few things to the excellent answers you've got so far, they really convinced me of how great RAW was....

- check out the CONTRAST control. Yeah, yeah, you know what that does, right? But take a RAW picture of a people shot, and in PP, start with LOWEST contrast. Then check Medium. Then check out HIGH contrast!.

Now..if you ask me, the rendering of these different examples is DRAMATIC! Portraits look GREAT at low contrast, and often suffer if it's higher. But other shots may call for Medium or High. With RAW, these are decisions that don't affect the quality of the picture. Awesome..

- check out the WB control. Same thing. Perfect adjustments, and no hit in image quality when using RAW..

Those 2 controls are about the only thing I ever do in RAW, but those are IMPORTANT controls if you ask me, as they can radically change the intent of the picture..

Http://www.flickr.com/photos/jcovert..

Comment #9

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