Re: Scanner Training Advice (was: UCR vs GCR...or Neither - RAW CMYK?)
Martin Orpen <orpy@...>
I was wondering if you and perhaps the list have any thoughts onI have no experience of CreoScitex training (apart from LeafCapture on the Volare camera). However, I have been to a number of scanner demos and would offer the following advice: Take your own originals rather than allowing the demonstrators to use their own standard demonstration images. This will enable you to see how the demonstrator copes with an image from scratch rather than have them rattle through a set routine that they have no doubt done hundreds of times before. Make sure that your originals are tough scanning propositions, for example: 1. An *arty* image that has no natural looking highlight, shadow or gray midtones. One that has been shot using coloured gels with vibrant RGB colours. This should demonstrate how well the demonstrator can cope with numbers only -- or whether the scanning software has profiles for standard film stocks. 2. A tranny that has had a hard life. See how the demonstrators cope with scratched and pitted originals. If the demo is on drum scanners then oil mounting will fill in most of the damage. If it's on a flatbed is it still possible to oil mount? 3. Under- and over-exposed transparencies. Take one of each and see how the demonstrator and scanner hardware cope with pulling out shadow and highlight detail. 4. Black and white prints. Take one of these along as a test of the scanner's light source. Some scanners have real problems with dust and surface imperfections on prints. You can do the scan in 5 minutes, but then have to spend an hour removing the blemishes. 5. A negative. Don't know what CreoScitex's position on negative is? Most conventional repro houses refuse to go anywhere near them. If the software is able to produce positives from neg, watch the adjustments that the demonstrator carries out. Large format negatives and positives are also ideal for spotting deficiencies on CCD scanners. In particular, check for banding artefacts in blue skies or red sunsets. If you see these, then you know that your scanner is using Kodak's last generation of 10K CCD chips. The banding is caused by connecting wires which run beneath the red and blue colour filters. Kodak recently redesigned their CCDs -- but most scanner manufacturers are still using stockpiles of the older model. While your originals are being scanned, take a detailed look at the USM functions of the scanner software. Scanner USM is usually far superior to Photoshop. However, this usually leads to a fairly complicated interface that you tend to forget after the demo and switch to "auto" when you get back to the shop :-) Likewise, with the separation settings, the scanner manufacturers usually tell you that profile x is best for this and profile y for that. Get as much information on the profiles as you can. Find out how easy it is to edit the CMYK profiles and whether the same profiles can be used in Photoshop. That should be plenty for one day! -- Martin Idea Digital Imaging Ltd - the "image" specialists http://www.idea-digital.com
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