Digital BW, The Print

Paul, John,

While the resizing may smooth out the histogram I am concerned that it is a
case where the original image information was lost due to over manipulation
and you wind up replacing that lost information during resizing with
artificial information.

Resizing may be an improvement over not resizing but I would want to work
very hard at not losing the data to start with.

I realize that a certain amount of data lose in 8-bit mode may have no
effect on the final print. Pushed to some point it will give you problems
and at that point I think if is better to go back to square one and rethink
your adjustments doing as much as you can in 16-bit space. I had one touchy
image that I wound up adjusting as 8 separate 16-bit files, applying the RGB
separation curve to each file, converting to  8-bit and then combining all
of them with layer masks for the final file. A lot of work but it did the
trick.

Martin

----- Original Message -----
From: "Paul Roark" <paul.roark@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Tuesday, March 19, 2002 1:58 PM
Subject: RE: [Digital BW] Combing cure -- change size after the curves are
applied


> John,
>
> You wrote:
>
> >...
> >The absence of combing in the resized image is not a sign that it's
> >'better', it's a sign that information has been lost. ...
>
> True.  Downsizing clearly eliminates information.  I suspect the
information
> lost is beyond what can be seen.
>
> So, the problem and cure -- that is, both the "combing" and the downsizing
> (that I would do anyway) -- are probably irrelevant to the ultimate image
> quality of the print.  I found it was not worth my time to print over 360
> dpi anyway.
>
> Paul
>
> _______________________-
>   -----Original Message-----
>   From: John Brownlow [mailto:lists@...]
>   Sent: Tuesday, March 19, 2002 11:13 AM
>   To: DigitalBlackandWhiteThePrint@yahoogroups.com
>   Subject: Re: [Digital BW] Combing cure -- change size after the curves
> areapplied
>
>
>   On 3/19/02 2:01 PM, "Paul Roark" <paul.roark@...> wrote:
>
>   > The very last step I now take is to change the size of the image in
>   > Photoshop from the scanner's native resolution to my print size at 360
> dpi.
>   >
>   > When I check the histogram there is no combing.
>   >
>   > I have not analyzed prints to see if I can see any difference.
>
>   It is obvious why this eliminates combing. When you resize, Photoshop
>   interpolates between the discrete values that represent the teeth of the
>   comb to arrive at the pixel values for the new image.
>
>   For example, let's say you have two neighboring pixels, one with value
150
>   and one with value 175, and the image displays combing between these two
>   values. Downsampling will probably produce a pixel in this region of the
>   photograph with an intermediate value of around 165. Thus you now have
> some
>   pixels with the intermediate value where previously there were none.
>
>   The absence of combing in the resized image is not a sign that it's
>   'better', it's a sign that information has been lost. You could also
>   eliminate combing by applying a 1 or 2 pixel radius gaussian blur before
>   printing, but I don't suppose anyone is doing that.
>
>   --
>   John Brownlow
>
>   http://www.pinkheadedbug.com
>
>
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