Digital Cameras Jpeg
What’s the difference of shooting in RAW vs. Jpeg on a digital SLR camera?
I just got a Canon xti digital SLR and I was told by the salesman to shoot in RAW because that’s best for editing, but I’m not sure I understand the difference between RAW and Jpeg. I’m going to Tokyo soon and I want to take the best pictures possible. Does RAW necessarily produce the highest quality? I would basically be uploading to my computer and printing the pictures in 8x10s. Also, I’m assuming its easy to switch between RAW and Jpeg on the same memory card, etc. I’m also going to try and take some pics for HDR, which it seems RAW is most appropriate. Any information about the differences of these formats and what I can do to produce the best quality would be great!
Well, in my opinion, You should maybe use the RAW..
Here’s why.
A Raw file is…
• not an image file per se (it will require special software to view, though this software is easy to get).
• typically a proprietary format (with the exception of Adobe’s DNG format that isn’t widely used yet).
• at least 8 bits per color – red, green, and blue (12-bits per X,Y location), though most DSLRs record 12-bit color (36-bits per location).
• uncompressed (an 8 megapixel camera will produce a 8 MB Raw file).
• the complete (lossless) data from the camera’s sensor.
• higher in dynamic range (ability to display highlights and shadows).
• lower in contrast (flatter, washed out looking).
• not as sharp.
• not suitable for printing directly from the camera or without post processing.
• read only (all changes are saved in an XMP “sidecar” file or to a JPEG or other image format).
• sometimes admissable in a court as evidence (as opposed to a changeable image format).
• waiting to be processed by your computer.
In comparison a JPEG is…
• a standard format readable by any image program on the market or available open source.
• exactly 8-bits per color (12-bits per location).
• compressed (by looking for redundancy in the data like a ZIP file or stripping out what human can’t perceive like a MP3).
• fairly small in file size (an 8 megapixel camera will produce JPEG between 1 and 3 MB’s in size).
• lower in dynamic range.
• higher in contrast.
• sharper.
• immediately suitable for printing, sharing, or posting on the Web.
• not in need of correction most of the time (75% in my experience).
• able to be manipulated, though not without losing data each time an edit is made – even if it’s just to rotate the image (the opposite of lossless).
• processed by your camera.
These differences lead implicitly to situations that require choosing one over the other. For instance, if you do not have much capacity to store images in camera (because you spent all your money on the camera body) then shooting in JPEG will allow to capture 2 or 3 times the number you could shooting in Raw. This is also a good idea if you are at a party or some other event afterwhich you want to share your photos quickly and easily.
On the other hand, if capacity is not an issue at all (1 GB and 2 GB flash cards are getting cheaper every week) you might consider shooting in Raw + JPEG, just to cover all the possibilities. If you cannot or do not want to do any post processing, then you simply have to shoot in JPEG. Taking a picture in Raw is only the first step in producing a quality image ready for printing. If, on the other hand, quality is of the utmost importance (like when you are shooting professionally), and you want to get every bit of performance your DSLR can offer then you should be shooting in Raw.
That being said, I know many professional photographers who do not shoot in Raw for one of two reasons: 1.) they don’t know how, or 2.) they don’t want to take the time to process the images afterwards.
Compression | Photography | JPG | JEPG | Digital Camera
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