Hello all,
I am a newbie in POV-ray and I am trying to generate a image with transparent
background.

I used:
background{colour rgbt <0.0, 0.0, 0.0>}

and I got a black background. Can anybody please provide your support to get a
black background?

Thanks.

William

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On 9/13/19 4:17 PM, William wrote:
> Hello all,
> I am a newbie in POV-ray and I am trying to generate a image with transparent
> background.
> 
> I used:
> background{colour rgbt <0.0, 0.0, 0.0>}
> 
> and I got a black background. Can anybody please provide your support to get a
> black background?
> 
> Thanks.
> 
> William
> 

Taking you not to be asking exactly what you asked, try:

background { colour rgbt <0,0,0,1> }

Your three values get promoted to 4 and the 't' values becomes 0 - or no 
transparency. Remember to use +ua and the default png type output(1).

Bill P.

(1) I think openexr is the other which supports the transparency, but I 
don't much use the feature myself so maybe not... Most image formats 
don't support it.

Post a reply to this message

William F Pokorny <ano### [at] anonymousorg> wrote:
> On 9/13/19 4:17 PM, William wrote:
> > Hello all,
> > I am a newbie in POV-ray and I am trying to generate a image with transparent
> > background.
> >
> > I used:
> > background{colour rgbt <0.0, 0.0, 0.0>}
> >
> > and I got a black background. Can anybody please provide your support to get a
> > black background?
> >
> > Thanks.
> >
> > William
> >
>
> Taking you not to be asking exactly what you asked, try:
>
> background { colour rgbt <0,0,0,1> }
>
> Your three values get promoted to 4 and the 't' values becomes 0 - or no
> transparency. Remember to use +ua and the default png type output(1).
>
> Bill P.
>
> (1) I think openexr is the other which supports the transparency, but I
> don't much use the feature myself so maybe not... Most image formats
> don't support it.


Hi Bill,

Thank you for your reply. My initial settings are like this below:
#include "colors.inc"
background {color rgbt <0, 0, 0, 1> }

#declare MainColor = rgb<1.0,0.0,0.0>;;
  camera {
    angle 45
    location <150.92993637586693,30.07787677021389,97.7056826656392>
    look_at <25,25,25>
  }
  light_source { <101.28273227706191,100.10083875733939,98.7618381976087> color
White shadowless}


I don't know how to intiate the UA setting. Can you please elaborate this?

William

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"William" <wil### [at] gmailcom> wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
> > On 9/13/19 4:17 PM, William wrote:
> > > Hello all,
> > > I am a newbie in POV-ray and I am trying to generate a image with transparent
> > > background.
> > >
> > > I used:
> > > background{colour rgbt <0.0, 0.0, 0.0>}
> > >
> > > and I got a black background. Can anybody please provide your support to get a
> > > black background?
> > >
> > > Thanks.
> > >
> > > William
> > >
> >
> > Taking you not to be asking exactly what you asked, try:
> >
> > background { colour rgbt <0,0,0,1> }
> >
> > Your three values get promoted to 4 and the 't' values becomes 0 - or no
> > transparency. Remember to use +ua and the default png type output(1).
> >
> > Bill P.
> >
> > (1) I think openexr is the other which supports the transparency, but I
> > don't much use the feature myself so maybe not... Most image formats
> > don't support it.
>
>
> Hi Bill,
>
> Thank you for your reply. My initial settings are like this below:
> #include "colors.inc"
> background {color rgbt <0, 0, 0, 1> }
>
> #declare MainColor = rgb<1.0,0.0,0.0>;;
>   camera {
>     angle 45
>     location <150.92993637586693,30.07787677021389,97.7056826656392>
>     look_at <25,25,25>
>   }
>   light_source { <101.28273227706191,100.10083875733939,98.7618381976087> color
> White shadowless}
>
>
> I don't know how to intiate the UA setting. Can you please elaborate this?
>
> William



Got it.. I added these two lines in the .ini file. Then it worked well.

Output_File_Type=N
Output_Alpha=on

Best, William

Post a reply to this message

Le 2019-09-13 à 18:26, William a écrit :
> "William" <wil### [at] gmailcom> wrote:
>> William F Pokorny <ano### [at] anonymousorg> wrote:
>>> On 9/13/19 4:17 PM, William wrote:
>>>> Hello all,
>>>> I am a newbie in POV-ray and I am trying to generate a image with transparent
>>>> background.
>>>>
>>>> I used:
>>>> background{colour rgbt <0.0, 0.0, 0.0>}
>>>>
>>>> and I got a black background. Can anybody please provide your support to get a
>>>> black background?
>>>>
>>>> Thanks.
>>>>
>>>> William
>>>>
>>>
>>> Taking you not to be asking exactly what you asked, try:
>>>
>>> background { colour rgbt <0,0,0,1> }
>>>
>>> Your three values get promoted to 4 and the 't' values becomes 0 - or no
>>> transparency. Remember to use +ua and the default png type output(1).
>>>
>>> Bill P.
>>>
>>> (1) I think openexr is the other which supports the transparency, but I
>>> don't much use the feature myself so maybe not... Most image formats
>>> don't support it.
>>
>>
>> Hi Bill,
>>
>> Thank you for your reply. My initial settings are like this below:
>> #include "colors.inc"
>> background {color rgbt <0, 0, 0, 1> }
>>
>> #declare MainColor = rgb<1.0,0.0,0.0>;;
>>    camera {
>>      angle 45
>>      location <150.92993637586693,30.07787677021389,97.7056826656392>
>>      look_at <25,25,25>
>>    }
>>    light_source { <101.28273227706191,100.10083875733939,98.7618381976087> color
>> White shadowless}
>>
>>
>> I don't know how to intiate the UA setting. Can you please elaborate this?
>>
>> William
> 
> 
> 
> Got it.. I added these two lines in the .ini file. Then it worked well.
> 
> Output_File_Type=N
> Output_Alpha=on
> 
> Best, William
> 
> 
You can add «+ua» on the command line. In the Windows version, it's the 
box just right of the resolution drop list.

Alain

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Bill P. wrote
try:
>
> background { colour rgbt <0,0,0,1> }
>
> Your three values get promoted to 4 and the 't' values becomes 0 - or no
> transparency. Remember to use +ua and the default png type output(1).
>
>

Wilfrieds reply

this line does not work for me

my .ini file contains

Output_Alpha=+UA                ;
Output_File_Type=N              ;

I want to use this image overlappimg with others to create a 3D game

Please send ma a simple COMPLETE code

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Attachments:
Download 'pic_0[1].jpg' (417 KB)

Preview of image 'pic_0[1].jpg'

On 4/7/25 14:37, Wilfree wrote:
> this line does not work for me
> 
> my .ini file contains
> 
> Output_Alpha=+UA

Hi,

Some of the error reporting for the options and ini settings could be 
better (Or work at all in this case. My yuqk fork misses the error 
too...). That last line above should have been:

Output_Alpha=on

   or

+ua

Here is a complete scene (use the default camera) showing the command 
line invocation to run it. It's set up for v3.7, but will work with v3.8 
releases too.

//--- this.pov
// Run with:
//      povray this.pov +ua +fn
// If running using an ini file the two key in options are:
//      Output_Alpha=on
//      Output_File_Type=N
#version 3.7;
background { rgbt <0,0,0,1> }
sphere {
     <0,0,2>, 0.2
     pigment { rgb <1,0,0> }
     finish { emission 1 }
}
//---


Bill P.

Aside: The options whether flag or ini formats can be used on either the 
command line or in ini files. Though, mostly, people stick to one method 
of specifying options.

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