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[filmscanners] Re: JPG sharpening [was: Color spaces for different purposes]



Anthony writes ...

> Laurie writes:
>
> > ... how does one sharpen between the conversion stage
> > and the compression stage?
>
> One does not.
>
> There seems to be a widespread misconception here.  While
> you are editing an image, it _does not have_ a format;
> it isn't JPEG, or TIFF, or anything else.
>  The image is stored on a file in JPEG or TIFF or whatever
> format you choose, but it has no format during editing,
> and so whether you edit a file opened from TIFF or JPEG makes
> absolutely no difference while you are editing.  An image in an
> editing program is just a mass of pixels.

  I believe the "misconception" of always sharpening before JPEG comes from
the common down-sampling.  That is, most images start out big before being
down-sized for wwweb presentation ... and the usual advice is: ... down-size
... sharpen (to remove the softening side-effects of down-sampling) ... and
save as JPEG.

cheerios ... shAf  :o)
Avalon Peninsula, Newfoundland
www.micro-investigations.com

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