Correct me if I am wrong.
jpeg files are compressed 8-bit image files.
Tiff (from the camera) are 8-bit image files that have not been
compressed.
RAW contains 12-bit information from each sensor site that can be
converted to 16-bit TIFF in a raw converter (which still contains the full
12-bit data).
Personally, when shooting with my digital, I save everything as RAW
which allow me to edit the dynamic range of the original image. This
minimises black holes and blown highlights.
Cheers,
Bob
----- Original Message -----
From: "Paul Stenquist" <[EMAIL PROTECTED]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Friday, June 16, 2006 11:51 AM
Subject: Re: Where Do All the Pixels Come From (was: Shooting Digi in
JPEGMode)
> Jpeg is a compressed file. Tiff is an uncompressed file. When you open
> a jpeg in PhotoShop, the software decompresses the file, restoring it
> to original size.
> On Jun 15, 2006, at 9:30 PM, Shel Belinkoff wrote:
>
>> Something I've noticed before, and in light of the wonderful
>> explanations
>> Godders has provided about JPEG and TIFF files, it seems like as good a
>> time as any to bring it up.
>>
>> Taking an image shot in highest quality JPEG on the DS results in a
>> file
>> size of 1,900kb. Doing absolutely nothing to it but converting to a
>> TIFF
>> results in a file size of 17,600kb. Converting that file to 16-bit
>> doubles
>> the size. Now, making the same shot using RAW results in a file size
>> of
>> about 10,000kb, and converting it to TIFF results in a file size of
>> approximately 35,000kb.
>>
>> I've noticed the same behavior with my little Sony. It will produce a
>> TIFF
>> and a JPEG simultaneously, and when the JPEG is converted to a TIFF
>> it's
>> the exact same size as the original TIFF.
>>
>> Further, when viewing a high quality JPEG in Photoshop, it shows the
>> file
>> size in the status bar to be about the same as the TIFF TIFF (or PSD)
>> file
>> made from that JPEG.
>>
>> So, if JPEG loses, or throws away, a lot of information, why are the
>> files
>> when converted to TIFF (or PSD) so large? Where does the extra info
>> come
>> from? And why does Photoshop show the smaller JPEG file to be the
>> size of
>> the larger TIFF or PSD file.
>>
>> Shel
>>
>>
>>
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>>
>
>
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