JPEG V RAW

esme

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4 Jul 2007 - 9:52 AM

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Is it true that all good photos are taken in RAW. I read this recently but would like some expert comment as am in the market to buy a new DSLR. Are all the photos on ePHOTOzine taken in RAW?

cameracat (e2 Member)

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4 Jul 2007 - 10:34 AM

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As Big Bri has said ( man of few words ) It would not be true to say that all good images are taken in RAW.

As a basic understanding, And I do mean basic, The major difference is the structure of the data in a RAW file when compared to a Jpeg.

A RAW file in most cases has no in camera adjustments added to the data, A RAW file is just that RAW data straight from the Cameras CPU and as seen by the Sensor.

The RAW file allows more in the way of Post production alterations in your imaging software ( ie Photohop or whatever ) In fact you are when dealing with RAW files, Doing the Job that the Camera's CPU normally does to Jpegs.

HOWever Your Computers CPU & Software are many times more powerfull that the one in your camera, So it gives you much more control over the finished image.

AS for Jpegs, These are normally almost ready to print straight from camera, Baring a minor adjustment here or there, BUT that's it, You have nothing like the options open to you, That a RAW file offers.

MOST if not all Camera manuals, PUT it simply like this, RAW for images that will be extensively manipulated in post production.

And Jpegs for images that might have a minor tweak, Then straight to print.

Big Bri, Is quite right in that there is truck loads of stuff re the Jpeg V RAW subject, I have made this as simple and brief as possible.

If you need further on the subject, Do take a look at the search for more in depth explanations.

Carabosse (e2 Member)

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4 Jul 2007 - 11:22 AM

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The RAW image has usually also been subjected to noise reduction. On certain cameras (not many!) the NR can be turned off.

keithh

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4 Jul 2007 - 3:33 PM

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actually it is if you know what you're doing - that is a fact whether people face it or not.

keithh

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4 Jul 2007 - 3:38 PM

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ah the unmanipulated splendour of our dear friend Velvia

esme

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4 Jul 2007 - 5:17 PM

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Many thanks to all for their comments which have been most helpful.

strawman

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4 Jul 2007 - 5:43 PM

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That's interesting as I find using Capture one and my 300D I get equivalent to a stop less of noise using RAW over JPEG. Plus you can fine tune the noise supression.

But to be honest I use RAW for the ability to finely control colour and the curves feature. Thinking of the maths, if you use curves to change the linearity of how the exposure is so you can extract more shadow detail for example, the RAW file has 12bits of data while the JPEG has only 8 bits, so you will run into blocking of pixels faster with JPEG.

And before anyone asks, not its not compensation for getting the exposure wrong, its for altering the relative exposure of highlights and shadows.

Boyd

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4 Jul 2007 - 7:03 PM

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Maybe this article will help.
Lots of facts there too.