POV-Ray : Newsgroups : povray.newusers : Why aren't my PNGs compressed? Server Time
28 Jul 2024 18:19:05 EDT (-0400)
  Why aren't my PNGs compressed? (Message 1 to 3 of 3)  
From: this is me
Subject: Why aren't my PNGs compressed?
Date: 16 Jun 2008 13:20:01
Message: <web.4856a01939cfa1f6861e7d780@news.povray.org>
I'm doing animation, and I switched from saving my frames as BMPs to PNGs
because I thought compression would occur.  After looking at the file output
size, though, they're all the same, and match that of a BMP.  Did I fail to
turn something on?  Is it because the windows version doesn't do compressed
PNGs?


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From: Warp
Subject: Re: Why aren't my PNGs compressed?
Date: 16 Jun 2008 13:23:09
Message: <4856a17d@news.povray.org>
this is me <nomail@nomail> wrote:
> I'm doing animation, and I switched from saving my frames as BMPs to PNGs
> because I thought compression would occur.  After looking at the file output
> size, though, they're all the same, and match that of a BMP.  Did I fail to
> turn something on?  Is it because the windows version doesn't do compressed
> PNGs?

  First you should check that the images are actually compressible.
Open one such image with some program (such as the gimp) and save it
to another PNG with normal compression and see if the result is indeed
smaller.

  Which command-line option did you use to output to PNG?

-- 
                                                          - Warp


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From: this is me
Subject: Re: Why aren't my PNGs compressed?
Date: 16 Jun 2008 15:10:00
Message: <web.4856b9562d7768612732a59b0@news.povray.org>
Gosh I'm so retarded sometimes - it seems I forgot to use an output file type of
N.  For some reason, I thought the PNG extension on the ouput base filename
would have been enough to tell POV what I wanted, but I guess one has to be
explicit (and read the docs!).

- T.I.M.


Warp <war### [at] tagpovrayorg> wrote:
> this is me <nomail@nomail> wrote:
> > I'm doing animation, and I switched from saving my frames as BMPs to PNGs
> > because I thought compression would occur.  After looking at the file output
> > size, though, they're all the same, and match that of a BMP.  Did I fail to
> > turn something on?  Is it because the windows version doesn't do compressed
> > PNGs?
>
>   First you should check that the images are actually compressible.
> Open one such image with some program (such as the gimp) and save it
> to another PNG with normal compression and see if the result is indeed
> smaller.
>
>   Which command-line option did you use to output to PNG?
>
> --
>                                                           - Warp


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