Difference between revisions of "RAW"
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| + | === Intro === | ||
'''RAW''' refers to a group of some hundred [[Image format|image formats]] proprietary to the respective camera manufacturers. | '''RAW''' refers to a group of some hundred [[Image format|image formats]] proprietary to the respective camera manufacturers. | ||
They all have in common that they contain the unprossesed data as it comes from the analog/digital (A/D) converter. This files need to be processed - at least interpolated, since the color information for most of them is located in different pixels - and converted to a common [[image format]] to be viewed or otherwise used. They might contain additional data comparable to the [[EXIF]] information. | They all have in common that they contain the unprossesed data as it comes from the analog/digital (A/D) converter. This files need to be processed - at least interpolated, since the color information for most of them is located in different pixels - and converted to a common [[image format]] to be viewed or otherwise used. They might contain additional data comparable to the [[EXIF]] information. | ||
| + | |||
| + | === RAW converters === | ||
There are numerous RAW converters but only few that can convert most or all RAW formats, most of them based on [[dcraw]] written by David J. Coffin. Most of them offer sophisticated ways to control [[white balance]], tonal range, contrast, shadow detail, exposure etc. Some even allow for correction of [[chromatic aberration]] or noise. | There are numerous RAW converters but only few that can convert most or all RAW formats, most of them based on [[dcraw]] written by David J. Coffin. Most of them offer sophisticated ways to control [[white balance]], tonal range, contrast, shadow detail, exposure etc. Some even allow for correction of [[chromatic aberration]] or noise. | ||
| − | + | You can always try and find out how to extract more [[dynamic range]] from RAW files in these converters, but in order to get 16 bit per channel output files with full [[dynamic range]] [[dcraw]] is recommended. | |
| + | |||
| + | === External links === | ||
| + | * More basic Information on Wikipedia Camera RAW page: [http://en.wikipedia.org/wiki/Camera_raw] | ||
| + | * Bob Atkins very informative page on RAW format: [http://www.photo.net/learn/raw/] | ||
| + | * Advantages and disadvantages of the RAW format and more basic information: [http://www.cambridgeincolour.com/tutorials/RAW-file-format.htm] | ||
| + | * dcraw generic RAW converter: [http://www.cybercom.net/~dcoffin/dcraw/] | ||
Revision as of 13:36, 7 July 2005
Intro
RAW refers to a group of some hundred image formats proprietary to the respective camera manufacturers.
They all have in common that they contain the unprossesed data as it comes from the analog/digital (A/D) converter. This files need to be processed - at least interpolated, since the color information for most of them is located in different pixels - and converted to a common image format to be viewed or otherwise used. They might contain additional data comparable to the EXIF information.
RAW converters
There are numerous RAW converters but only few that can convert most or all RAW formats, most of them based on dcraw written by David J. Coffin. Most of them offer sophisticated ways to control white balance, tonal range, contrast, shadow detail, exposure etc. Some even allow for correction of chromatic aberration or noise.
You can always try and find out how to extract more dynamic range from RAW files in these converters, but in order to get 16 bit per channel output files with full dynamic range dcraw is recommended.