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ALL Image File are born in RAW
When I think about it, I conclude that ALL digital images, even those
from the most rudimentary, entry level digicam, must start out life as a raw file. I mean.....What else could it be? A bunch of 0s and 1s right from the sensor. To make the raw data useful to the average photographer, the camera had to do some serious processing to store and output the data as a jpeg or tiff file. As demand for better access to the unprocessed data increased camera manufacturers ALLOWED the user to download this minimally processed data as RAW. I suspect that in the "early days" it was just a matter of jpeg being "good enough" and it saved valuable and scarce memory space which was at a real premium in those days. I remember that in 2000, a 512 MB Micro drive cost about $250. Bob Williams |
#2
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ALL Image File are born in RAW
Bob Williams wrote:
When I think about it, I conclude that ALL digital images, even those from the most rudimentary, entry level digicam, must start out life as a raw file. I mean.....What else could it be? A bunch of 0s and 1s right from the sensor. You have the right idea. But, it is "raw data", not a raw file. It may or may not ever be put into a file... To make the raw data useful to the average photographer, the camera had to do some serious processing to store and output the data as a jpeg or tiff file. As demand for better access to the unprocessed data increased camera manufacturers ALLOWED the user to download this minimally processed data as RAW. The other way around. Initially the cpu in the camera didn't have enough power to do fancy conversions, so the raw data was all that was available from the camera. Then when more compute power became available it was used to generate "finished" images (and for some consumer cameras the raw data was no longer made available). I suspect that in the "early days" it was just a matter of jpeg being "good enough" and it saved valuable and scarce memory space which was at a real premium in those days. I remember that in 2000, a 512 MB Micro drive cost about $250. It certainly made one think about how many to buy! But, the Nikon D1 price was $5000, and the RAW files were much smaller than of raw files from a Nikon D3 today. -- Floyd L. Davidson http://www.apaflo.com/floyd_davidson Ukpeagvik (Barrow, Alaska) |
#3
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ALL Image File are born in RAW
Bob Williams wrote:
When I think about it, I conclude that ALL digital images, even those from the most rudimentary, entry level digicam, must start out life as a raw file. Well, that depends on your definition of file. It is a sequence of raw data. On UNIXoid operating systems pretty much any data is considered a file, even a keyboard or a USB interface or computer performance statistics. In that sense yes, it is a file. If you are using a more conservative meaning of file like data that is stored in a file system on a storage device, then no, it is not a file, because the data will be converted into e.g. a JPEG on the fly before being written to the storage media. jue |
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ALL Image File are born in RAW
Bob Williams wrote:
When I think about it, I conclude that ALL digital images, even those from the most rudimentary, entry level digicam, must start out life as a raw file. I mean.....What else could it be? A bunch of 0s and 1s right from the sensor. ... perhaps it is actually a flow of photo-electrons, captured in a somewhat noisy way by the read amplifier? David |
#5
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ALL Image File are born in RAW
David J Taylor wrote:
Bob Williams wrote: When I think about it, I conclude that ALL digital images, even those from the most rudimentary, entry level digicam, must start out life as a raw file. I mean.....What else could it be? A bunch of 0s and 1s right from the sensor. .. perhaps it is actually a flow of photo-electrons, captured in a somewhat noisy way by the read amplifier? David Yes! That's right. Bob |
#6
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ALL Image File are born in RAW
Bob Williams wrote:
When I think about it, I conclude that ALL digital images, even those from the most rudimentary, entry level digicam, must start out life as a raw file. I mean.....What else could it be? A bunch of 0s and 1s right from the sensor. To make the raw data useful to the average photographer, the camera had to do some serious processing to store and output the data as a jpeg or tiff file. As demand for better access to the unprocessed data increased camera manufacturers ALLOWED the user to download this minimally processed data as RAW. I suspect that in the "early days" it was just a matter of jpeg being "good enough" and it saved valuable and scarce memory space which was at a real premium in those days. I remember that in 2000, a 512 MB Micro drive cost about $250. Bob Williams I disagree. This would be true only if RAW files had no processing whatsoever, were just a matrix of original electron data in an array. But most camera RAW files DO have some sort of processing. Many have already done the color allocation, some have some compression. What is done to the data depends on the camera and the model. If this were not so, you would not need the RAW conversion software, you could dump it to the screen with a very simple universal program. |
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