Digital BW, The Print

Depending on the paper used, I think it would be difficult to see pixel  
by pixel - even with a loupe. It is however a worthy experiment so I  
will check it out.

On Monday, July 28, 2003, at 10:10  AM, Peter Nelson wrote:

> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Loring Palleske
> <lorpal@m...> wrote:
>> NO. Dithering is not done on a pixel by pixel basis.
>>
>> On Sunday, July 27, 2003, at 02:33  PM, Peter Nelson wrote:
>>
>>> Think of it this way - at maximum printer resolution it can only
>>> represent 46 distinct tonal values in the surface area of the
> paper
>>> where the pixel might have any value from 0-255.
>> Regards,
>
> Actually, we don't know WHAT the dithering algorithm they use is.
> BUT there's a simple test you can do, which I've done on all three
> of my inkjet printers (HP 970CSE, Epson 870, and Epson 2200):
> Create a test pattern of individual pixels and one-pixel-wide-lines
> separated by one-pixel white space.   Create the image and print it
> without doing any rescaling, so the pixels and 1-pixel wide lines
> are sent to the printer AS 1 pixel.   Just for fun, do this at
> different resolutions - I've tried it at 240, 300, 360, 400, and 600
> PPI.
>
> You will find that they are individually rendered and distinct under
> magnification at resolutions up to 360 or so DPI, depending on the
> printer.
>
> In reality we have some good evidence that the 2200 resamples before
> dithering.  But if they did a stochastic dither over an area greater
> than 2 pixels-width than adjaecent pixels would blur together.
>
>
>
>
>
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Regards,

Loring Palleske
Creative Imaging
  905.441.2661