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Digital BW, The Print

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RE: [Digital BW] Why so coarse grain?

2003-12-01 by Paul D. DeRocco

> From: akvarnsudio [mailto:emilio.gallo@...]
>
> Two days ago I thought myself to be the only one who wanted to make
> nice B&W prints. One workflow I\ufffdve tried is to convert my picture to
> grayscale, adjust it and convert it into bitmap using diffusiongitter
> (don\ufffdt know the english term for it) with 1000 dpi (Photoshop). The
> result on screen is very similar to what I want: tiny, tiny dots of
> pure black where the eye hardly can see the grain. The output from my
> printer (Epson 1290) however is very coarse regardless of how the
> printers resolution is set.

But you're explicitly doing in Photoshop exactly what the Epson driver does
anyway. When you pile the Epson dithering on top of the PS dithering, you're
winding up with extra grain.

Let the driver do the dithering. Just convert your image to grayscale using
whatever tools you prefer (e.g., channel mixer, gray proof setup, Hue/Sat
adjustment layer with saturation = 0, etc.) Then, select Black Only in the
driver, and let it make the fine black dots.

The only reason one would create explicit dithering in PS is if you want the
dots larger, so you can actually see them.

--

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

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