Hi Andrew
Figure on 24 bits per pixel, so 3 bytes per pixel. 8MPx3 give you 24MB to store 1 pic without compression.
But, it that number certainly looks wrong. My RebelXT is an 8MP unit, shooting in raw gives about 6 to 8MB per pic. So I guess, RAW mode already contains some form of lossless compression.
Shooting JPEG 'fine' mode gives about 2.5 to 3MB per pic.
1GB = 1000MB. Figure from there..
Cheers!
Clem
Figure on 24 bits per pixel, so 3 bytes per pixel. 8MPx3 give you 24MB to store 1 pic without compression.
But, it that number certainly looks wrong. My RebelXT is an 8MP unit, shooting in raw gives about 6 to 8MB per pic. So I guess, RAW mode already contains some form of lossless compression.
Shooting JPEG 'fine' mode gives about 2.5 to 3MB per pic.
1GB = 1000MB. Figure from there..
Cheers!
Clem
Hi,
that 24Mb estimate matches up with Olympus TIFF storage of 23.3MB per pic.
But they also quote RAW @ 13.5MB/.
What is Jpeg? are these lossy compression or lossless?
Jpeg gives 1.9MB/, 4.3MB/ and 6.1MB/
So TIFF gets 42pics onto 1GB
and RAW gets 74pics onto 1GB without any loss. Is that right?
that 24Mb estimate matches up with Olympus TIFF storage of 23.3MB per pic.
But they also quote RAW @ 13.5MB/.
What is Jpeg? are these lossy compression or lossless?
Jpeg gives 1.9MB/, 4.3MB/ and 6.1MB/
So TIFF gets 42pics onto 1GB
and RAW gets 74pics onto 1GB without any loss. Is that right?
Hi,
I'd expect RAW to actually vary dependent on lighting etc, dependent on how redundant the data is.
JPEG is definitely lossy. It's the compression used on most of the images you see on the web, now that GIF has copyright etc.
Yep, 42 and about 74 or 75 pics for tiff and raw, in your case...
Cheers!
I'd expect RAW to actually vary dependent on lighting etc, dependent on how redundant the data is.
JPEG is definitely lossy. It's the compression used on most of the images you see on the web, now that GIF has copyright etc.
Yep, 42 and about 74 or 75 pics for tiff and raw, in your case...
Cheers!
a RAW-file is, technically speaking, not even an image.
It's the raw data taken from the camera-ccd, before internal camera post-processing takes place.
This means you have to take care of the post-processing yourself.
In your digital dark-room, using specific software to read the raw data.
Some links regarding raw versus jpeg:
http://www.kenrockwell.com/tech/raw.htm
http://www.prime-junta.net/pont/How_to/o_RAW_workflow/_RAW_workflow.html?page=5
With kind regards,
Klaas
It's the raw data taken from the camera-ccd, before internal camera post-processing takes place.
This means you have to take care of the post-processing yourself.
In your digital dark-room, using specific software to read the raw data.
Some links regarding raw versus jpeg:
http://www.kenrockwell.com/tech/raw.htm
http://www.prime-junta.net/pont/How_to/o_RAW_workflow/_RAW_workflow.html?page=5
With kind regards,
Klaas
Hi!
One more link:
http://www.dpreview.com/learn/?/Glossary/Digital_Imaging/
dpreview has in my opinion very comprehensive camera reviews.
One more link:
http://www.dpreview.com/learn/?/Glossary/Digital_Imaging/
dpreview has in my opinion very comprehensive camera reviews.
Personally i don't bother with raw nor tiff;
my 4 mpixel camera can take upto 3 shots per second using jpeg,
it takes 2-3 seconds for one shot when i use tiff.
When editing, i always save "inbetween edits"using a lossless format, bmp or tiff.
Every time you save, depending on the editing you did, there is a potential loss using jpeg.
This also depends on the jpeg-quality settings in your editing-software.
When i need the final result f.i. for web use, i convert to jpg.
Also i ALWAYS keep the original jpg.
Klaas
my 4 mpixel camera can take upto 3 shots per second using jpeg,
it takes 2-3 seconds for one shot when i use tiff.
When editing, i always save "inbetween edits"using a lossless format, bmp or tiff.
Every time you save, depending on the editing you did, there is a potential loss using jpeg.
This also depends on the jpeg-quality settings in your editing-software.
When i need the final result f.i. for web use, i convert to jpg.
Also i ALWAYS keep the original jpg.
Klaas
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