![]() Now when I use one of the standard filters on an image in PS, I get the error message such as “Could Not Complete the Reduce Noise Command Because the ICC Profile is Invalid.” As I assume most users do, I embed the ICC profile in the tiff to insure that my colors are as accurate as possible. After I upgraded to the licensed version, I began to have problems. ![]() I was then able to process the scans as I always have using Photoshop CS2. Using the demo, I scanned 4x5 transparencies in 48bit using multi exposure. I successfully used the demo to insure compatability with my equipment, specifically an Epson 4870 scanner running under WinXP. I upgraded from SilverFast AI 6.4 to SilverFast AI Studio 6.5. I emailed SilverFast's tech support about eight hours ago, but no reply yet. I hit annoying snag with my SilverFast upgrade. But it was not a tough test - that comes tomorrow. That took about 11-12 minutes start to finish. I scanned a 4x5 at 1200 ppi at 2X Multi-exposure. I'd think that for anyone who wants or needs more range from their scanner this might be quite a feature. From their site Silverfast claims a huge increase in effective d-max of the scanner. I don't know for sure if this will work as well as they claim (having done only one scan today) but it seems like a good idea. This is not Multi-Sampling (which they already offered) which I never found any real use for and I understand did not always register perfectly. So in Silverfast Multi-Exposure mode the scanner does multiple scans at different exposures and the scans are put together in register in a 16 bit file via software. The idea here is that Silverfast will do it for you in software and it works on scanners that don't offer single pass multiple scanning. Note that multi-scanning is the only way to increase the quality at the highest resolution, and that using "Output|TIFF size reduction" is a better way of producing quality scans at lower resolutions. Scanning at 1350 dpi in this case will throw away every other pixel and every other scan line, while scanning at 2700 dpi and setting "Output|TIFF size reduction" to 2 will result in averaging 2x2 blocks of pixels and increasing the number of effective bits of resolution by 2 bits. For instance, scanning at 2700 dpi and averaging every 2x2 block of pixels will result in a higher-quality 1350 dpi scan than just scanning at 1350 dpi. The second technique is multi-pass multi-scanning, which most scanners are capable of (however, some can't accurately reposition each scan pass, so this sometimes doesn't work well).Īnother useful way of getting multiple image samples is to scan at a higher resolution and then average adjacent blocks of pixels. The film scanners that can do single-pass multi-scanning are the Minolta QuickScan 35, Scan Dual, Scan Dual III, Scan Multi, Scan Multi Pro, Scan Speed, Scan Elite, Scan Elite II and Nikon LS-2000/LS-4000/LS-8000. Some scanners are capable of reading each pixel position multiple times before advancing the scan head to a new position. The first of these is single-pass multi-scanning. There are several ways of getting multiple image samples. For instance, if you have a 10-bit scanner like the Nikon LS-30 and you read the CCD 4 times at each pixel position, you get effectively 12 bits of useful image data. Each doubling of the number of pixels increases the effective number of useful bits of data by one. The basic idea is scanning each pixel more than once and averaging these pixels. Here's an anwer to my own question about VueScan, taken from Īfter you've decided on the resolution of your finished image (or alternatively the pixel dimensions of your finished image), how do you maximize the image quality? There's one thing you can do which involves taking longer to scan but getting more raw data for each pixel in the finished image. The 750 is actually sloppier than the 4990 was.Ĭan one do this one's self, by scanning multiple times, and then merging the layers in Photoshop ? In otherwords the software appears to work great, but the hardware is still lacking. The scanner has to be warm (fresh from a "dummy" scan) otherwise subsequent passes may be enough out of size to defeat the registration program. The multiscan feature appears to be a big improvement but still there are problems with the consistency of passes with the 750 as did the 49. This is correctable by tweaking the profile in Negafix and saving it but I always wonder what a really bang on profile would do. ![]() Their profiles almost always generate too much magenta in the blues. I am beginning to think that this is because I shoot 160S at EI 100 instead of the 160 it is profiled at and the 2/3 stop difference causes a color shift that is inconsistent with the profile. The new profiles don't exite me, but that may be my problem, read below, For instance I was using a tweaked NPS profile for 160S, but the new 160S profile doesn't seem any better. I've had it for about a week and a half now. ![]()
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