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Joe Tomasovsky |
19:00 19 Feb 03 |
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Phil |
19:45 19 Feb 03 |
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Jeff Segar |
5:06 14 Jul 03 |
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Bruce at Lightbox |
16:12 13 Jan 03 |
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Phil |
18:07 13 Jan 03 |
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David Mark |
8:52 14 Jan 03 |
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Phil |
12:06 14 Jan 03 |
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Michael Keslin |
14:11 20 Nov 02 |
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Re: Enlarged digital negatives/platinum prints |
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Brian Mikiten |
8:55 21 Nov 02 |
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Michael -
I'm in the middle of something very similar to this. I'm using standard 4x5 and 120 negs and then printing them on a 1280 using the R9 driver and inks. I've thus far done the screen calibrations using a Spider and then printed the included stepwedges using the ICC profiles I generated (for the scanner and screens). There are a few issues to deal with when trying to apply the BTZS testing methods to the digital realm. The first (as you know) is the translation from the different types of media (LCD/CRT to print) when making either prints or negs. You are adding another step in the process as you want to achieve a specific negative density right? Have you used the test procedures and generated a stepwedge negative that matches your scanned wedge values? You can (as you noted) use photoshop to get density values but you may have to invert the image to get the negative density values. I'm doing the same thing on my end going to print from the scanned image. In your case, you have to compensate (using the output curves) to get a suitable print.
All that said, I think you can use P/M software to do this. I'd start by characterizing the stepwedge values from a scan and then printing those directly on a negative before printing to paper. Use the neg values to be sure you aren't adding any annomolies in that step. It is my current supposition that a decent long scale negative with little information in the toe area of the curve can be used to make any print through photoshop. In other words, the issue of the paper ES is less of a problem in digital realm. Photoshop allows you to "make" a negative of any scale if the original image file has sufficient information. The paper in your case is the negative. In my case, it is the values you find when you read the reflective values from the printed stepwedge on the paper. That too, can be modified in photoshop to "look" like any silver paper scale.
Brian
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Larry Francis |
19:21 2 Nov 02 |
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