POV-Ray : Newsgroups : povray.general : Partial Output Options Server Time
5 Nov 2024 20:19:14 EST (-0500)
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From:
Subject: Partial Output Options
Date: 21 Jan 2003 11:10:06
Message: <web.3e2d7027f1c1584e31ece9d0@news.povray.org>
I can't open images built by povray when I use The Partial Output Options (
-StartColumn or the others).
I use png format and try to see images with electric eye (Cannot load image)
or with the Gimp (a part of image is loaded but there is a warning that the
image is corrupted).

Is it possible to convert images to normal files ?

Thanks


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From: Khi2
Subject: Re: Partial Output Options
Date: 21 Jan 2003 11:25:07
Message: <web.3e2d737a509d521631ece9d0@news.povray.org>
INVALID_ADDRESS wrote:
> [...]

My Address is valid, I think there is a bug
I'm using the web interface.



--
MSc in ASc
University of Manchester
mor### [at] csmanacuk


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From: Thorsten Froehlich
Subject: Re: Partial Output Options
Date: 21 Jan 2003 12:01:19
Message: <3e2d7cdf$1@news.povray.org>

<mor### [at] csmanacuk> wrote:

> I can't open images built by povray when I use The Partial Output Options (
> -StartColumn or the others).
> I use png format and try to see images with electric eye (Cannot load image)
> or with the Gimp (a part of image is loaded but there is a warning that the
> image is corrupted).
>
> Is it possible to convert images to normal files ?

POV-Ray uses the PNG reference implementation (libpng) to create its PNG
files.  If some programs cannot read image files generated by the PNG
reference implementation, I would recommend to report it to the authors of
those programs as bug.

    Thorsten


____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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From: Christoph Hormann
Subject: Re: Partial Output Options
Date: 21 Jan 2003 12:19:09
Message: <3E2D810D.EEBF760B@gmx.de>
Thorsten Froehlich wrote:
> 
> POV-Ray uses the PNG reference implementation (libpng) to create its PNG
> files.  If some programs cannot read image files generated by the PNG
> reference implementation, I would recommend to report it to the authors of
> those programs as bug.

To be fair it should be noted that POV-Ray cannot read png files from a
partial/interrupted render as image maps/heightfields/... either.  The
libpng function to load whole images ('png_read_image()') has problems
with them.  Reading the image line by line ('png_read_row()') helps (this
is what i did for HCR-Edit and what POV does in 'Read_Rendered_Part()' for
continuing interrupted renders).  

Maybe i should post a bug report concerning this? ;-)

Christoph

-- 
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 31 Dec. 2002 _____./\/^>_*_<^\/\.______


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From: Thorsten Froehlich
Subject: Re: Partial Output Options
Date: 21 Jan 2003 13:06:49
Message: <3e2d8c39@news.povray.org>
In article <3E2D810D.EEBF760B@gmx.de> , Christoph Hormann 
<chr### [at] gmxde>  wrote:

> Maybe i should post a bug report concerning this? ;-)

Yes.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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From: Khi2
Subject: Re: Partial Output Options
Date: 21 Jan 2003 13:10:08
Message: <web.3e2d8bee509d521631ece9d0@news.povray.org>
>To be fair it should be noted that POV-Ray cannot read png files from a
>partial/interrupted render as image maps/heightfields/... either.  The
>libpng function to load whole images ('png_read_image()') has problems
>with them.  Reading the image line by line ('png_read_row()') helps (this
>is what i did for HCR-Edit and what POV does in 'Read_Rendered_Part()' for
>continuing interrupted renders).

>Maybe i should post a bug report concerning this? ;-)

Yep,

But only povray uses partial images, So it's normal that other software
can't read such files.
Povray should build the whole image (complete the partial image with
transparent or black pixel)

Khi2


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From: Thorsten Froehlich
Subject: Re: Partial Output Options
Date: 21 Jan 2003 13:38:41
Message: <3e2d93b1@news.povray.org>
In article <web.3e2d8bee509d521631ece9d0@news.povray.org> , "Khi2" 
<mor### [at] csmanacuk> wrote:

> But only povray uses partial images, So it's normal that other software
> can't read such files.

No, they are completely valid PNG files.

> Povray should build the whole image (complete the partial image with
> transparent or black pixel)

That is not possible.  It would require to generate PNG image as a whole in
the end.  If you interrupt a render it could no longer be continued this
way.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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