
""digital will never be able to replicate the tonality nor depth of colours in my slides"
Much as no human would be able to withstand the forces generated by travelling at the sort of velocities an early steam locomotive, nor climb to the highest peaks of the world, nor reach its poles, nor survive in space, nor stand on the surface of the Moon."
Correct but....
Colours are subjective and so are colour films etc. Modern monitors--especially LCD--have pretty pathetic colour gamuts and since the demise of the CRT (Cathode Ray Tube) monitor things have gotten worse. Colour television (especially its cousin digital photography) are not capable of reproducing, either on photographic paper or on a monitor screen, the subtle changes in gamut that many films have. This is not because the gamut of the digital photographic system is less but has more to do with the precise colour coordinates of the reproducing phosphors (photographic paper etc.)--even the system additive or subtractive colour [as here respectfully] makes a difference.
Let me give you an example, get any ancient photo that has a patina on the silver halide part and has gone sepia colour with age. I defy you to scan/reproduce this image in any way you wish on any digital system to wish to try it on and not notice how bad the reproduction of the patina is and how 'yellow' or 'red' or whatever colour the sepia has become--the sepia is no longer a subtle colour. This is typical of gamut limitation even though the overall range of the electronic system is better than the original photograph--perhaps considerably more so.
I don't have the time here to elaborate in detail about the intricacies of colour systems etc. but I do understand what Richard 45 is trying to say. Here's another example which may illustrate the point: you get a good-to-excellent Kodachrome slide and project it onto a good screen with good optics then scan the same slide at 48 bit--even use a drum scanner if you wish--then display it on a monitor, and I'll bet that--even if you are very familiar with the 'Kodachrome look' (which is unique in my opinion)--in a double-blind test you'll fail miserably to detect the Kodachrome slide on a digital monitor in any consistent manner. Why? Some intangible quality of the picture is missing--and it's missing because of limitations, primarily but not exclusively, in the display monitor.
Let me prove the point:
If you are not familiar with Cineraria then have as look at this flickr photo (no it's not mine).
http://www.flickr.com/photos/36916122@N03/3430574665/
Now go to any large conservatory (usually in some botanical garden etc.) where you can see thousands of these lovely little flowers growing. Seeing one is not sufficient--you must see many of them to appreciate the very subtle variations in the blue colour that different flowers can produce.
Cineraria are absolutely fabulous for this test: not only do they produce a vast range of blues but those blues gradually fade on a continuum into brilliant white at the end of the petal--so good this white you can use it as a reference. Picture in your mind this huge range of blues then compare a photograph of the same flowers with any photographic reproduction system at your disposal.
So devastating this test, the first reaction of many photographers is that they want to throw away their cameras. Thousands of shades of blue just morph into one or perhaps two shades of a much less vibrant blue.
The point is that colour display technology is essentially pathetic in its colour gamut when compared with a pair of good human non-colour-blind eyes. As good as colour systems are today, they still can't measure up with the colour discrimination of our eyes---especially so in the blue region of the spectrum.
Thus, when an observer, familiar with a specific colour dye (with its unique distinctive colour spectral response), is disappointed by the reproduction of its colour after it has passed though and been reproduced by some other colour chain, that his reaction is not only unsurprising but also we ought to expect him to be disappointed with the change in colour.
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BTW, the flower shown in the flickr photo is typical of what I'm talking about--there's very little variation in the blues after the colour has been reproduced by an electronic (or photographic) system--as here, but the subtle gamma possible in some films often give them the edge over electronic ones.