Ratings and Reviews Write a review. I was able to scan everything and then printed. About this product Product Identifiers Brand. If this makes no sense to you, that’s my point. You may also like. If you only start out with 24 bits, by the time you get done in Photoshop you have lost a few bits of accuracy due to all the small mathematical errors. This item doesn’t belong on this page.

Uploader: Julkis
Date Added: 18 March 2009
File Size: 38.11 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 99568
Price: Free* [*Free Regsitration Required]

About this product Product Identifiers Brand. All that aetra is that they take the 8-bit per channel results and re-dither deliberately add noise to each sample value and feed you the results umax astra 2000 12 bits of precision in the math.

UMAX Astra U Specs – CNET

Fingerprint Reader scanner U. Another reader in Chicago wrote ME trying to get my help in getting her umax astra 2000 to run. Mathematical errors accumulate with every operation, just as you would if you always had to write down your results from balancing your checkbook with only 4 digits. That means that at best they use an analog-to-digital convertor that just happens to have 12 umax astra 2000 coming out of it to digitize each of the signals from the analog outputs of the CCD preamplifier for each of three color channels red, green and astfa.


UMAX says they are working on this as of March We only can see between 6 to 8 bits wstra channel log 18 to 24 bits per pixel umax astra 2000 best. Therefore, ignore people who work in computer stores and try to get you to believe that more bits are better, and can’t even explain exactly what the extra bits do.

The Myth of 36 Bit Scanning. See details for description of any imperfections.

This umax astra 2000 in contrast to the all-in-one Microtek ScanDeck, which when set to resolutions below its maximum of DPI gives nasty alaised images. You may also like. If your final output is around DPI u,ax greater you’ll probably get better results umax astra 2000 without descreening. I find the descreening function give better scans for all originals when your desired output is at low resolutions like DPI.

I was able to scan everything and then printed. By starting with and working with more buts you can easily preserve your accuracy. Umax astra 2000 all 2 astta offer listings. One looses accuracy in every 8 bit Photoshop operation, even though all the bits are still there.

For somebody that has 2000 nice space to pt umax astra 2000 flatbed scanner in their home I recommend get this scanner. Canon B Scanner 1. This item doesn’t belong on this page. It came with a bundle of nice applications and I upgraded it every time I got a new windows operating system. It also made a MHz iMac completely unstable and unbootable.


Descreening, because it scans at the highest resolution regardless of the final resolution you select, can take forever for scans of a whole page. You need 16 bits to represent the product of two 8 bit numbers, so when the answer has to be truncated or rounded or redithered back to to 8 bits umax astra 2000 loose something.

Umax Astra 2000P Scanner Flatbed Scanner

It just makes your files sizes double what they ought to be to clog up your hard drive. UMAX couldn’t get it to go. Even worse, unless you are using the newest version of Photoshop 6. Skip to main umax astra 2000. This becomes critical if you are playing with levels and curves.

Browsing interrupted

Hopefully by aatra I’ve convinced you that these internal details are meaningless taken outside the context of the entire system design of a scanner.

At umax astra 2000 the noise level of this scanner is at about 30 bits per pixel, and probably even more. Best Selling in Scanners See all.

That’s too bad, because I gave up myself.