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Hi,
is the png output file format of POV-Ray (when using +FN in the ini file) always
lossless, independent from any computer system settings? I ask because most
image editing software allows to set a compression level before saving a png
file.
Thanks!
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On 10/24/2012 9:21 PM, Sereib wrote:
> Hi,
>
> is the png output file format of POV-Ray (when using +FN in the ini file) always
> lossless, independent from any computer system settings? I ask because most
> image editing software allows to set a compression level before saving a png
> file.
>
> Thanks!
>
>
Uh.. The whole point of PNG is that its lossless.
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Sereib <nomail@nomail> wrote:
> is the png output file format of POV-Ray (when using +FN in the ini file) always
> lossless, independent from any computer system settings? I ask because most
> image editing software allows to set a compression level before saving a png
> file.
The PNG format doesn't even support lossy compression.
--
- Warp
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Am 25.10.2012 06:21, schrieb Sereib:
> is the png output file format of POV-Ray (when using +FN in the ini file) always
> lossless, independent from any computer system settings? I ask because most
> image editing software allows to set a compression level before saving a png
> file.
I guess you're mixing up png (which is always lossless) with jpeg (which
is always lossy).
As for jpeg compression level, in POV-Ray 3.7 you can set that with the
"compression=" ini file setting (specifying a value from 0.0 to 1.0,
with 1.0 being highest quality).
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Sereib wrote:
> Hi,
>
> is the png output file format of POV-Ray (when using +FN in the ini fil
e) always
> lossless, independent from any computer system settings? I ask because
most
> image editing software allows to set a compression level before saving
a png
> file.
>
As others have said, PNG is always lossless. The "compression
level" setting that some software offers is simply a compromise
between speed/memory and file size (same as for zip files since PNG
uses the same compression algorithm as zip).
Jerome
--
mailto:jeb### [at] free fr
http://jeberger.free.fr
Jabber: jeb### [at] jabberfr
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