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Re: [APML] A questions for users of the SS4000
>OK, my fault, I did not give you all the information. I always scan my
>images in 'raw mode'. However, in the pre-scan dialogs, when dialing in
>the settings, there are plenty of options and those are what I'm
>wondering about.
If you choose raw mode, then no later adjustements are made to the data. That means, no matter the settings you put, the results are always the same. Perhaps there is only one exception: brightness. I don't know if it controls the lamp or is just a digital adjustement post-scan. For all my scans I set all the settings to the default and use as profiles color slide or color negative, and sRGB for visualization. When saving the file, I discard the profile.
>I'm just guessing here, but I assume that by changing
>the settings with E-200 from 'color slides' to 'under-exposed color
>slides', I unknowingly adjusted the scanner exposure time allowing a
>more thorough scan. Thereby allowing a complete histogram, which I
>believe iswhat we all want. Correct?
I think that the profile only changes the gamma value of each channel for visualization, and has nothing to do with the scanning process. It changes the values after that. So, I'm inclined to think that a true raw scan is always the best option.
I think that if you see clipped histograms is becouse the background is just too dark and the scanner isn't capable of discriminating it from pure black. I'd recomend to you to push your slides up to two steps, allowing the film base become less opaque, and by far more easy to scan.
Regards,
Carlos Milovic F.
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Astro & Photo - CMF
http://www.astrophoto.vze.com
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Visita "AstroFoto", el foro de astrofotografía en español
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