Digital BW, The Print

ruhrfoto wrote:

>  --- In DigitalBlackandWhiteThePrint@y..., Todd Flashner
> <tflash@e...> wrote:
> >
> > While we are on the subject of Bernds driver comparison, I
> saw something in
> > there that I had never seen before. Look at the two smaller
> prints that were
> > both printed with the Piezo driver. The large smoke stack on
> the left has a
> > moiré  pattern in it's lower third. It's not there in the Epson
> driver
> > print, but that is a larger print, so I wouldn't expect them to be
> the same.
> > But what could be the cause of that moiré ?
> >
> > Todd
>
> Todd., this is a phaenomenem which has nothing to do with the
> drivers. I should have mentioned this in my data sheet.
> It has something to do with the grade of magnification of the
> image in PS. It seems to be a form of interference of fine
> structures (lines) during the sampling/resampling process in PS
> which appears while creating larer or smaller images. The
> raw-files of the images are the same. The interferrence came up
> by downscaling the large image. If I upscale it again, it
> disappears. You can reproduce the same phaenomenem with
> the piezo test file (lines pattern) which comes with the piezo
> software, it is visible on the monitor by stepwise magnification.
> Best regards
> Bernd
>

I still maintain that it's the reaction of the scan grid to the piezo grid, causing moiré patterns.

Harvey  Ferdschneider
partner, SKID Photography, NYC







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