POV-Ray: Newsgroups: povray.general: Image Size

POV-Ray : Newsgroups : povray.general : Image Size		Server Time 1 Nov 2024 16:21:48 EDT (-0400)

From: John Eliot
Subject: Image Size
Date: 13 Jun 2000 02:13:16
Message: <3945d0fc@news.povray.org>

Could anyone tell me if there is a limit to the resolution of images you
create with povray? could i for instance create an image 10240x7680 ? do
different file formats only support up to a maximum resolution?


Thanx
John

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From: Pabs
Subject: Re: Image Size
Date: 13 Jun 2000 02:46:15
Message: <3945D8E4.4FAFE315@hotmail.com>

John Eliot wrote:

> Could anyone tell me if there is a limit to the resolution of images you
> create with povray? could i for instance create an image 10240x7680 ? do
> different file formats only support up to a maximum resolution?

Theoretically YES but practically NO - limited by RAM - for image bytes &
virtual mem & when I tried it with a simple scene POV took forever to create
light buffers.

Pabs

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From: Christoph Hormann
Subject: Re: Image Size
Date: 13 Jun 2000 05:17:03
Message: <3945FC0F.39424AEE@gmx.de>

John Eliot wrote:
> 
> Could anyone tell me if there is a limit to the resolution of images you
> create with povray? could i for instance create an image 10240x7680 ? do
> different file formats only support up to a maximum resolution?
> 
> Thanx
> John

I don't know about pov, but file formats are limited by width and height
data fields:

        TGA :           16 Bit (65535x65535)
        PNG :           32 Bit (... ;-)

Thats probably far away from usual values 
(24 Bit TGA uncompressed 65535x65535 would be 12 GB !)

HTH, Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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From:
Subject: Re: Image Size
Date: 13 Jun 2000 07:01:51
Message: <wbwvjtondv.fsf@infostream.no>

[Christoph Hormann <chr### [at] gmxde>]
| Thats probably far away from usual values 
| (24 Bit TGA uncompressed 65535x65535 would be 12 GB !)

But on some OSes (like Windows) your image would be limited by the
filesystem.

-- 
Never attribute to malice that which 
can be adequately explained by stupidity.

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From: Margus Ramst
Subject: Re: Image Size
Date: 13 Jun 2000 23:12:16
Message: <3946EA34.A4C0D047@peak.edu.ee>


> 
> But on some OSes (like Windows) your image would be limited by the
> filesystem.
> 

I don't understand. What is the limiting factor? (besides FAT 16 maximum
partition size)

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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From: Margus Ramst
Subject: Re: Image Size
Date: 14 Jun 2000 00:33:51
Message: <3946FD51.24B175ED@peak.edu.ee>

Christoph Hormann wrote:
> 
>         TGA :           16 Bit (65535x65535)
>         PNG :           32 Bit (... ;-)
> 
> Thats probably far away from usual values

If I'm not mistaken, an A1 print at 1440 DPI would be 33,675 by 47,678 points.
Granted, this is an extreme example - but even a 'mere' A4 print would be 11,904
by 16,837 points.
So these numbers are not quite as imossible as they might seem. Working with
images intended for high-quality printing is a royal pain, to say the least.

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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From: Thorsten Froehlich
Subject: Re: Image Size
Date: 14 Jun 2000 03:50:16
Message: <39473938@news.povray.org>

In article <3946EA34.A4C0D047@peak.edu.ee> , Margus Ramst 
<mar### [at] peakeduee>  wrote:

>> But on some OSes (like Windows) your image would be limited by the
>> filesystem.
>>
>
> I don't understand. What is the limiting factor? (besides FAT 16 maximum
> partition size)

There are still a lot of filesystems that have a 2 GB or 4 GB file size
limit.  Additionally, a lot of applications make assumptions about certain
system file IO functions, i.e. when seeking inside a file and using long or
unsigned long (which is most likely 32 bit on common platforms today).

    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: Image Size
Date: 14 Jun 2000 04:54:11
Message: <39474833.2383C242@gmx.de>

Margus Ramst wrote:
> 
> If I'm not mistaken, an A1 print at 1440 DPI would be 33,675 by 47,678 points.
> Granted, this is an extreme example - but even a 'mere' A4 print would be 11,904
> by 16,837 points.
> So these numbers are not quite as imossible as they might seem. Working with
> images intended for high-quality printing is a royal pain, to say the least.
> 

Normally, you do not need a full printer resolution image for printing,
because the printer has to do rastering anyway, even though some people
recommend exactly that.  

AFAIK a high quality offset print for example for illustrated books has
about 100 to 300 dpi.  

Christoph

--
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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