On 7/1/09 23:00, "aussieshepsrock" <[email protected]> wrote:
>
> Original Poster here..
>
> This jpeg vs tiff question is pretty important to me. My personal
> experience with jpegs is that the inherent nature of how the
> compression it uses works, very little quantities of data loss equate
> with the Functional Loss of the image. My limited knowledge of the
> 'nature' of TIFF is that (to some extent) it is more resistant to
> losing the entire image if data describing specific pixels is lost or
> compromised. Does anyone know if this is correct?
>
> A further question I have is that the TIFF 'standards' site I was
> looking at indicates that a previously 'patented' compression option
> inside of TIFF -I believe the LZW option- was transfered to the public
> domain -or something similar- so it is considered an open standard
> that Archive and Library folks and companies are more comfortable
> using it. My question is whether the LossLess Internal File
> Compression option makes the individual files be more at risk in the
> presence of 'partial' file loss?
>
> :-)
>
> Richard
Uncompressed tiff is possibly the simplest format for 24 bit digital
storage with a view to perfect repro. The RGB data is stored as three xy
pixelmaps of the 8 bit channel values in uint8 (unsigned 8 bit integer) or
the binary equivalent of nought to 255 (signed would add a negative or
positive symbol). So you have three channels of colour data - one for each
of RGB - and 256 available integers for the levels in each channel. In the
case of a simple one pixel solid colour like Pantone Process Cyan the tiff
file saves the channels as 0 Red, 157 Green and 217 Blue. Matlab will open
uncompressed tiff files and displays the image as three pages of values from
0 - 255. I don't know of anything which will open a jpeg as text or binary
info......
Worth bearing in mind is the effect of differing colour profiles - an
image which has been optimised on a monitor in the sRGB colourspace will
look very different on a monitor which uses a wider profile like the Adobe
wide Gamut space - as the channel/level info will be recalculated up to suit
and similarly the other way - data from a wider colourspace is shrunk - or
in the case of absolute colorimetric dumped - to fit the smaller space.
I don't actually use the Fuji Pro black discs for image storage at all -
I use them for Red Book CD Audio - and no coasters or failures yet though I
imagine audio is the most punishing use of CDR - in and out of jewel cases
etc
Pete
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