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Proper Lighting Conditions
Thanks to GTI, this PDF shows some common specifications that are included in the ISO 3664:2000 guidelines.

Thursday December 18, 2003
by GTI Graphic Technology, inc.

A lot of discussion on proper lighting and environmental conditions in the digital darkroom have been discussed. Here is a PDF from GTI, the makers of excellent light boxes. It does provide some information from the ISO 3664:2000 standard.

Weekly Chatter:Need for Correct Exposure in RAW
Wednesday November 26, 2003
by weekly chatter

Each and every week, Imaging Revue offers non-members a tantalizing taste of the information available within our forums. Make sure to check out the entire list!

Soft Proof Tutorial by John Paul Caponigro
Monday November 24, 2003
by John Paul Caponigro

John Paul Caponigro walks the reader through the processes of soft proofing images in Photoshop in this elegant and useful PDF excerpt from his book "Photoshop Master Class". orders placed through John Paul at info@johnpaulcaponigroarts.com receive a free PDF Guide to Getting Good Color.

Weekly Chatter:Photoshop CS - Print with Preview settings
Thursday November 20, 2003
by Imaging Revue Experts and Members

Each and every week, Imaging Revue offers non-members a tantalizing taste of the information available within our forums. Make sure to check out the entire list!

Greg Gorman's B&W; conversion technique
Tuesday November 18, 2003
by Greg Gorman

Greg Gorman shares with the Imaging Revue subscribers, a technique that finally allows him to shoot color and still get the B&W; effect he desires. Designed by his retoucher Rob Carr, this step-by-step tutorial will show you a great new way to not only convert color to B&W; but add color toning as well! Please refer to the forum thread that got this discussion started.

...see more articles(many more!)

forums

Color Management/WorkFlow > Hardware and Software > Problems of RAW scan to Adobe1998 working space

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AuthorSubject: Problems of RAW scan to Adobe1998 working space   [Go to Bottom of Page]
Paul Thompson
Posted on Mon Dec 22, 2003 9:53 AM

I am using Silverfast to get RAW scans from my 6x7 velvia transparencies. (I am using HDR but having read the archives I'll have a look at using "48bit colour")

I need my tiff files in the Adobe1998 colour space to pass on to my agencies. They must be in this colour space.

The RAW scan histogram looks very good with the white and black points where I want them. Approximately 8 and 248 in each channel.

I then assign my scanner profile. The scan now looks pretty good and just like my transparency. Unfortunately I now need to convert to Adobe1998 which is where the trouble starts.

Once I convert to Adobe 1998 the blacks are severely clipped, particularly in the reds and greens. I have tried Perceptual and now use Relative Colormetric (which seems to not clip quite so much)

I am now left with the reds at say 4, greens often 0 and the blues maybe at 15.

I take it that this is normal and unavoidable as we are squeezing a large "Velvia" gamut of colours into a smaller Adobe1998 gamut?

Assuming I've done everything correctly so far, what is the best method of getting my clipped reds and greens back to around 8?

What I have been doing so far is opening up a curve in the green and red channels, locking down everything above say 14 and changing the 0 to an output of around 8. Then back to the levels and setting the eyedropper at 8 to bring the blues down to get a neutral black.

Does this workflow make any sense? I don't particulaly like the fact that the histogram looks as though it has been shoved along from 0 to 8 in a tall vertical pile (which it has!)

Any help, suggestions would be appreciated.
Paul




... this thread contains expert advice from Andrew Rodney and Bruce Fraser.




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