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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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