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Re: Sprite files

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In message <35fb3d025c.harriet@bazleyfamily.co.uk>
          Harriet Bazley <harriet@bazleyfamily.co.uk> wrote:


>>>> To have a good result it is necessary that this density is better
>>>> distributed between 0 and 256, which is 2 arrows of the histogram tool
>>>> makes it possible to make
>> 
>>> There are two arrows underneath the histogram, one about a quarter of
>>> the way across and another about three-quarters of the way across.
>> You can get closer to the vertical line, there is no information in the
>> white parts of the histogram.
>> 
> Oh, I see (I think) - the idea is to discard the 'white' areas in order
> to focus more closely on the existing range of variation within the
> small 'black' area.  Like cropping a digital image to give the effect of
> zooming in on the detail in part of the picture.
Yes, but the details in this case are the gray levels, for the image you 
have to reduce the pixels added by antiialiasing. The use of the histogram 
will reduce the  range of these gray levels without reducing the contours 
of the objects.
Another example, if your image contains gray areas generated by shadows 
during shooting or scan. You will be able to delete them


Fom David Pilling manual:
    "Under the histogram, are two arrows which can be dragged from side to  
 side. When Expand is clicked on, the range of intensities between the 
arrows will be expanded to fill the full range."
    "Expand and Equalise are crude tools. They may be of use with images 
where all the pixel intensities have been squashed into a narrow band. "

> (I don't get any visible result by clicking 'Expand' on my images,
> though, probably because they were already exported from PDF in a
> 2-colour sprite mode;  the histogram remains as a single thin vertical
> line, but with two arrows now located close on either side of it....)
Indeed if the Sprite contains only pixels "0" and "1", the histogram will 
not be useful.

I guess you export from a file created by Gview?
The histogram does not change, but the image yes, the UNDO button allows 
you to make tests and refine the adjustments of the cursors.
The most important parameter for Sharpeye and OCR in general, is the size 
of the objects to recognize.
With gview I use monochome and 300% and with DPlng I start with Edit/Scale 
300%

I would like to make a little note for the document processing in "OCRed" 
... with Risc OS.

Freescore scores, often are only scan, not very good.

-- 
Jean-Michel

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Sprite files Chris Newman <newslists@npost.uk> - 2025-02-22 12:45 +0000
  Re: Sprite files Steve Fryatt <news@stevefryatt.org.uk> - 2025-02-22 14:06 +0000
    Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-23 10:55 +0000
      Re: Sprite files Chris Hughes <news13@noonehere.co.uk> - 2025-02-23 11:31 +0000
        Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-23 12:01 +0000
          Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-23 23:34 +0000
      Re: Sprite files Dave <dave@triffid.co.uk> - 2025-02-23 11:54 +0000
        Re: Sprite files John <newsmcc@blueyonder.co.uk> - 2025-02-23 14:37 +0000
          Re: Sprite files Dave <dave@triffid.co.uk> - 2025-02-24 08:30 +0000
            Sprite files Dave <dave@triffid.co.uk> - 2025-02-26 11:50 +0000
              Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-26 16:42 +0000
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-26 17:45 +0000
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-26 17:54 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-02-26 21:10 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-26 22:04 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-02-27 10:07 +0100
                Re: Sprite files druck <news@druck.org.uk> - 2025-02-28 09:51 +0000
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-28 10:45 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-02-28 12:38 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-28 14:02 +0000
                Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-28 15:58 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-02-28 20:02 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-28 11:07 +0000
                Re: Sprite files druck <news@druck.org.uk> - 2025-02-28 14:17 +0000
                Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-27 22:17 +0000
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-27 23:32 +0000
                Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-28 00:24 +0000
                Re: Sprite files Stuart <Spambin@argonet.co.uk> - 2025-02-28 10:45 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-02-28 12:50 +0100
                Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-28 15:57 +0000
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-28 17:24 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-02-28 20:37 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-02-28 21:26 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-03-01 11:31 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-03-23 19:14 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-03-24 11:38 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-03-24 15:20 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-03-24 18:50 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-03-24 18:46 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-03-25 10:33 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-03-25 10:40 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-03-25 19:52 +0100
                Re: Sprite files Alan Griffin <ajg@argonet.co.uk> - 2025-03-25 21:45 +0000
                Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-03-25 23:16 +0100
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-03-25 23:52 +0000
                Re: Sprite files Harriet Bazley <harriet@bazleyfamily.co.uk> - 2025-03-25 21:58 +0000
                Re: Sprite files Kevin Wells <kev@kevsoft.co.uk> - 2025-02-27 23:27 +0000
                Re: Sprite files Chris Newman <newslists@npost.uk> - 2025-02-28 15:53 +0000
                Re: Sprite files Kevin Wells <kev@kevsoft.co.uk> - 2025-02-26 21:03 +0000
      Re: Sprite files Jean-Michel <jmc.bruck@orange.fr> - 2025-02-24 10:42 +0100

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