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[filmscanners] Re: Channel alignment test for B&W scanned asRGB

My first Visioneer 300 dpi scanner had the red so out of alignment I had
to bump the red channel/layer in Photoshop several pixels to get it
aligned.  I don't know what was wrong with that machine, but it was
replaced a month later with a 600 dpi model, and that one was replaced
within weeks with a UMAX scsi model.  I still have all of them, just got
too lazy back then to return them.


Simon Lamb wrote:

> Thanks Steve. Seems to be that all scanners have a margin for error set, and
> the degree of the misalignment from one scanner to another can vary quite a
> bit.
> Simon
> on 23/5/02 9:47 pm, steven.chambers@btinternet.com at
> steven.chambers@btinternet.com wrote:
>>I have observed this effect on the Epson Expression 1680 Pro - there is
>>certainly a small but perceptible jump when switching from the red to the
>>green channel. On this machine the green channel is also much sharper than
>>the red or blue - I routinely scan monochrome negatives as positive 16 bit
>>RGB and convert to greyscale using only the green channel.
>>Steve Chambers

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