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Re: Sprite files

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In message <8062ac025c.harriet@bazleyfamily.co.uk>
          Harriet Bazley <harriet@bazleyfamily.co.uk> wrote:

> On 24 Mar 2025 as I do recall,
>           Jean-Michel  wrote:

>> 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.
> [snip]

>>> (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?

> I think it was from Gview, but it might have been from !PDF or !PDFTest;
Ok
Note: With Muview we can get good sprites and export them after zooming 
in.

>> The histogram does not change, but the image yes, the UNDO button allows
>> you to make tests and refine the adjustments of the cursors.

> I tried again by exporting a page from the same PDF file (the Pleyel
> quartet I sent to you), which is definitely not in monochrome since it
> contains red bar numbers.

> But I still don't see any change to the image, even to the red sections.
Sorry but I can't find the file, if you can send it back to me.

> However, if I go to the *first* page of the score, which contains a
> scanned image rather than the notes drawn in an embedded music font,
> then moving the arrows on the histogram and clicking on 'Expand' does
> affect the portion of the page with the image on it.


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

> Clearly this particular score is too high-quality a PDF file (probably
> computer-typeset rather than scanned in) to be affected by histogram
> manipulation.   :-)

 too high-quality a PDF file  !!!! and in 2 colors mode?
It should be perfect for OCR!
I am interested ...

I found a file at ISMLP (Pleyel Quartet) ...
and also at MuseScore String Quartet B303.


-- 
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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