[rollei_list] Re: Scanners
- From: "Neil Gould" <neil@xxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Fri, 27 Nov 2009 10:15:33 -0500
Hi Richard,
> From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
> Date: Thu, 26 Nov 2009 12:16:23 -0800
>
> ----- Original Message -----
> From: "Austin Franklin" <austin.franklin@xxxxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Wednesday, November 25, 2009 5:42 AM
> Subject: [rollei_list] Re: Scanners
>
>
>> Hi Peter,
>>
>>> TIFF files are nice but huge and still not a RAW, but a
>>> TIFF. Semantics I
>> guess.
>>
>> It's not semantics. It's a concept. As Jim said, TIFF
>> and raw are not
>> mutually exclusive. TIFF is simply a file format. Raw
is
>> the data that is
>> in that file format.
>>
>> A TIFF file that contains raw data will not be
>> significantly larger than any
>> other raw data file. The only thing that can be changed
>> in a raw file that
>> significantly changes file size is how the data is
packed.
>> Being a software
>> guy, you should understand how that would work.
>>
>> Regards,
>>
>> Austin
>
> I am puzzled, I thought TIFF was compressed using
> non-lossy compression so that the original data could be
> recovered without change (unlike JPEG) and RAW was, as the
> name implies, the data coming from the camera or scanner
in
> completely uncompressed form. Is this wrong?
>
TIFF is not in a compressed file format, but it can contain
data that is compressed using other algorithms, e.g. ZIP,
LZR, etc. In such cases, a program reading such files would
also need to be able to decode the algorithm, and this
ability is not universal.
best,
Neil
---
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