Re: [Gambas-user] Blurry text when PDF pages are rendered with gb.poppler and displayed with a DocumentView

[Gianluigi <gradobag@xxxxxxxxxxx>]

Il 28/02/24 17:10, Claus Dietrich ha scritto:
> Am 24.02.24 um 13:26 schrieb Benoît Minisini:
> > In the last commit, I modified the Render() method so that if you
> > specify the width and height arguments, and not the resolution
> > argument, the best drawing resolution will be automatically computed.
> >
> > That way, no need to tackle the problem of conversion between pixels,
> > resolution and absolute size anymore!
> >
> > Here is the modified code in the DV_PDF_POPPLER project:
> >
> > Public Sub DocumentView1_Draw(Page As Integer, Width As Integer,
> > Height As Integer)
> >
> >   Dim hImage As Image
> >
> >   hImage = $PDF_Doc[Page].Render(0, 0, Width, Height)
> >   Paint.DrawImage(hImage, 0, 0)
> >
> > End
>
> Am 24.02.24 um 14:06 schrieb Gianluigi:
> > Hi Benoit and Claus,
> >
> > I would say that now the pdf with gb.poppler is ok.
> > Attached image
>
> Benoit: Thank you for your efforts and
>
> Gianluigi: thanks for your test
>
> but a test with the up to date master and the newly proposed draw
> event handling routine (without setting the document resolution) still
> shows that gb.pdf provides a better result. The difference is not
> overwhelmingly but it is clearly visible.
>
> Here the 1:1 comparison as screenshot:
> https://magentacloud.de/s/aKDS2d2ySgKRn4K
>
> Upper: gb.pdf
>
> Lower; gb.poppler
>
> The rendering result of gb.pdf is also competitive with a document
> viewer like xreader and hence my reference.
>
> Text rendering is a very complex subject which I do not fully
> understand but I believe that a "suitable" resolution cannot be the
> only key for a good result. I am wondering what gb.pdf is doing
> differently.
>
> Best regards
>
> Claus
Hi Claus,

here with my hardware, gb.poppler looks slightly sharper overall.
This probably depends on the hardware and perhaps, indeed certainly, I
no longer see as well as before but to my eyes and on my screen the
image you posted is equivalent.
That is to say, I don't notice any differences between the two windows.

I greet you and wish you a good evening
Gianluigi


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