POV-Ray: Newsgroups: povray.binaries.images: PNG image as Povray render result: bug or not?

POV-Ray : Newsgroups : povray.binaries.images : PNG image as Povray render result: bug or not?		Server Time 7 Nov 2024 07:33:45 EST (-0500)

From: LanuHum
Subject: PNG image as Povray render result: bug or not?
Date: 10 Oct 2016 11:45:00
Message: <web.57fbb6f31fca49e37a3e03fe0@news.povray.org>

If load in GIMP png image сreated povray:
dialog appears:

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From: clipka
Subject: Re: PNG image as Povray render result: bug or not?
Date: 10 Oct 2016 14:16:37
Message: <57fbdb05$1@news.povray.org>

Am 10.10.2016 um 17:42 schrieb LanuHum:
> If load in GIMP png image сreated povray:
> dialog appears:

POV-Ray-generated PNG images contain an oFFs chunk, which is an optional
data block (and therefore not present in all PNG files) telling reading
applications where to place the image contents on a page or canvas.

I'm a bit surprised GIMP asks you about the placement even when the oFFs
values are x=0,y=0.

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From: LanuHum
Subject: Re: PNG image as Povray render result: bug or not?
Date: 10 Oct 2016 14:55:00
Message: <web.57fbe391c5a587797a3e03fe0@news.povray.org>

clipka <ano### [at] anonymousorg> wrote:
> Am 10.10.2016 um 17:42 schrieb LanuHum:
> > If load in GIMP png image сreated povray:
> > dialog appears:
>
> POV-Ray-generated PNG images contain an oFFs chunk, which is an optional
> data block (and therefore not present in all PNG files) telling reading
> applications where to place the image contents on a page or canvas.
>
> I'm a bit surprised GIMP asks you about the placement even when the oFFs
> values are x=0,y=0.

It means everything is OK.
Thanks!

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