Digital BW, The Print

> From: kingdex1
>
> Michael Reichmann:
>
> "There is an important control at the upper left of the dialog
> box titled Auto. Here is what
> its purpose is, as described to me by the engineers at Adobe. A
> conventional Grayscale
> conversion such as you would get in Photoshop using the Mode
> menu, or even via some
> more complex techniques involving Lab and multichannel mode, or
> such as you would get
> by simply turning down the Saturation control in Lightroom's
> Develop or in ACR, just takes
> the colorimetric definition of how luminous a pixel is and uses
> that as the gray level. The
> results are independent of the actual colors in the image. So, if
> the colorimetry does not
> provide much differentiation, then the grayscale conversion will
> lack detail.
> The Auto grayscale option in Lightroom looks for optimal settings
> for the grayscale mixer
> so that the line from black to white, instead of just following
> colorimetric definitions,
> follows a path that creates the greatest diversity of grayscale
> values, based on the
> distribution of colors in the image.

Interesting. I try to do this sort of thing with Curves, while watching the
histogram. I can't try it since the beta is Mac only, but I expect this
feature will appear in the next version of Photoshop.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@...