Am 26.04.2010 15:01, schrieb Warp:
> Slime<fak### [at] emailaddress>  wrote:
>> I don't think the default file type should be one that uses lossy
>> compression.
>
>    I didn't know that POV-Ray even supported lossy formats as output...

Contrary to rumors, POV-Ray can output JPEG.

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clipka <ano### [at] anonymousorg> wrote:
> Am 26.04.2010 15:01, schrieb Warp:
> > Slime<fak### [at] emailaddress>  wrote:
> >> I don't think the default file type should be one that uses lossy
> >> compression.
> >
> >    I didn't know that POV-Ray even supported lossy formats as output...

> Contrary to rumors, POV-Ray can output JPEG.

  Is that new in POV-Ray 3.7? How do you fine-tune the compression options?

-- 
                                                          - Warp

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On 04/26/2010 02:34 PM, Warp wrote:
> clipka <ano### [at] anonymousorg> wrote:
>> Am 26.04.2010 15:01, schrieb Warp:
>>> Slime<fak### [at] emailaddress>  wrote:
>>>> I don't think the default file type should be one that uses lossy
>>>> compression.
>>>
>>>    I didn't know that POV-Ray even supported lossy formats as output...
> 
>> Contrary to rumors, POV-Ray can output JPEG.
> 
>   Is that new in POV-Ray 3.7? How do you fine-tune the compression options?
> 
http://wiki.povray.org/content/Documentation:Reference_Section_1.1#Output_File_Type

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On 26.04.10 19:34, Warp wrote:
> clipka<ano### [at] anonymousorg>  wrote:
>> Am 26.04.2010 15:01, schrieb Warp:
>>> Slime<fak### [at] emailaddress>   wrote:
>>>> I don't think the default file type should be one that uses lossy
>>>> compression.
>>>
>>>     I didn't know that POV-Ray even supported lossy formats as output...
>
>> Contrary to rumors, POV-Ray can output JPEG.
>
>    Is that new in POV-Ray 3.7? How do you fine-tune the compression options?

It has been there in 3.6 as well, but was simply inaccessible from the 
command line (but would have been accessible i.e. for special rendering of 
insert menus from inside POV-Ray, though this was not done). In 3.7 general 
access was added.

	Thorsten

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On 26.04.10 00:16, clipka wrote:
> Am 25.04.2010 23:20, schrieb Alain:

>>> How about changing the default output file type for both Windows and
>>> Unix version to PNG?
>>
>> Why not for all versions?
>
> With me having not much of an idea about Macs anyway, I pass that
> question on to any Mac experts listening right now...

PNG is the system's preferred file format in Mac OS X.

	Thorsten

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Jim Holsenback <jho### [at] povrayorg> wrote:
> >   Is that new in POV-Ray 3.7? How do you fine-tune the compression options?
> > 
> http://wiki.povray.org/content/Documentation:Reference_Section_1.1#Output_File_Type

  Thanks.

-- 
                                                          - Warp

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On 4/25/2010 4:44 AM, clipka wrote:
> How about changing the default output file type for both Windows and
> Unix version to PNG?

Another vote for PNG. That's the format I always go to for POV.

-- 
~Mike

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Am 26.04.2010 19:34, schrieb Warp:

>> Contrary to rumors, POV-Ray can output JPEG.
>
>    Is that new in POV-Ray 3.7? How do you fine-tune the compression options?

No, it has just been undocumented - for good reason: POV-Ray 3.6 was 
able to generate JPEG output as well, but the quality was terrible and 
couldn't be changed.

With 3.7, compression is set with the "Compression=N" INI-file option, 
where N is an integer value from 2 ("horrible") to 100 ("top quality"). 
A value of either 0 or 1 will select the default (95; 3.6 apparently 
used a value somewhere around 10).

There are still issues though: While IC displays the JPEG output images 
as expected, Windows Explorer preview and Photoshop 6.0 get the RGB 
values wrong way round (i.e. blue displays as red and vice versa). So 
given that IC normally does a pretty good job at JPEGs, POV-Ray must be 
doing something pretty unconventional there.

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"clipka" <ano### [at] anonymousorg> wrote in message 
news:4bd40f13$1@news.povray.org...
> How about changing the default output file type for both Windows and Unix 
> version to PNG?

Yes please!

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clipka <ano### [at] anonymousorg> wrote:
> Am 26.04.2010 19:34, schrieb Warp:
>
> >> Contrary to rumors, POV-Ray can output JPEG.

> With 3.7, compression is set with the "Compression=N" INI-file option,
> where N is an integer value from 2 ("horrible") to 100 ("top quality").
> A value of either 0 or 1 will select the default (95; 3.6 apparently
> used a value somewhere around 10).

I always thought that .jpeg compression quality was set within a simpler
1-through-10 scale --just those and no in-between values. (That's how my old
version of Photoshop does it, anyway...which is about the extent of my
knowledge.)

How was 95 arrived at for the 3.7 default (vs. 100)? They're so close. More
importantly, can all image-viewing apps decode .jpegs created with such a
'fine-scale' 1-to-100 compression choice? I base this question on problems I've
encountered (in Photoshop again, v5.0): strangely, even within its own 1-to-10
scale, there are several values that produce an image which isn't viewable in
some other apps I have. Maybe that's strictly a problem with the older
Photoshop--but it makes me wonder about the 1-to-100 variation in 3.7. Could the
'wrong choice' of a particular interim value produce an image-decoding problem?

Ken

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