V700 developing Chromatic Aberrations after limited use.

<p>When I got my V700 earlier this year I checked it out briefly. All seemed OK and I think I got a good example. At that time I also scanned a bw 35mm neg to keep as a refernce for later comparisons.</p>

<p>This weekend I was going to try out some different scanning software but first of all I decided to refamiliarise myself with the way I initially got that reference scan with Epson Scan. I saw straight away some unwanted colours in the detail of a sweater in the neg's image. I rescanned and got the same.</p>

<p>I found an area of the neg that shows the CA at its best and I am posting it here. So this is an enlargement of a b/w 35mm neg scanned at 2400 with the original refernce to the left and today's scan to the right.</p>

<p>Clickable link thumbnail.... <a href="http://www.imagebam.com/image/e2540d97308114" target="_blank"><img src="http://thumbnails27.imagebam.com/9731/e2540d97308114.jpg" alt="imagebam.com" /></a></p>

<p>Is this normal? I have to admit I am seriously disheartened having moved from a scanner that almost made me jump for joy to one that now exhibits CA of this degree. Would anyone consider this to be an unacceptable level? Is there a way to get the scanner to calibrate itself out of this?</p>

<p>(Between the two scans I mentioned today I shut the scanner down, reapplied all locks and released them thinking they might have realigned something internal).</p>

<p>Brian, that's not CA, your left image is simply B&W.</p>

<p>Do a monochrome conversion of the new one, is there any loss of detail, as you'd expect in an image with severe CA?</p>

<p>Perhaps the first time you set the software to produce a B&W image and the second time you scanned in color? In any event, since it's a B&W image, import into photoshop or equivalent, and desaturate.</p>

<p>Hi,</p>

<p>I am a bit of a newbie when it comes to digital things so I'll have to ask what makes you think only one scan is colour?</p>

<p>When I started today to replicate the reference scan I checked its mode and CS4 says its RGB @8bits per channel. Windows Explorer agrees and has them as 24 bits. So both those scan crops are RGB @ 8 bits per channel hence my pleasure at seeing the first one (really good neutrality) and constanation with the second one (CA).</p>

<p> </p>

<p>RGB 8 bits/channel is simply the format you saved the images in. That has nothing to do with how the scanning software processed them.</p>

<p>The two images have equal detail. Despite one of them appearing to have CA, they are equal in size. I tried a simple experiment with PhotoShop, using the channel mode, I selected only the red channel. Then selected a rectangle around the right image, dragged the rectangle up and down until I got a better alignment, and then did the same thing with the blue channel. The end result was sharper than the left image. You need to learn how to work the CA compensation on your scanning software (if it has any) or how to do the CA repair in PhotoShop...</p>

<p>Hi Jospeph,</p>

<p>Thank you for your reply :) I am a bit confused now. So are you still saying the left hand image is black and white and the right is colour and now the difference is down to software, not as I'd thought, hardware?? [You see I thought I used the same scanning settings and save settings for both and that a true bw image was just shades of grey (the K of CMYK). On the two recent scans I did try scanning as colour (rather than bw) but got a result I think I would have remembered as the scans had a real strong colour cast and not the kind of thing I knew how to cancel easily, so reverted to selecting bw for them. I am sure I didn't move any curves or anything when initially scanning the refernce frame].</p>

<p>Taking the old line from Kodak...get it right first time...I was hoping there would be a way to get rid of this misalighnment at scan rather than having to do as you had done (push channels around) or use the lens filter (that didn't seem to work very well when I tried it yesterday).</p>

<p>And what is it that you saw initially that told you one was bw and one was not? I am just trying to learn. And what is it that you see than tells you this is software not hardware. I'm no longer a bit confused. but very confused! :-\</p>