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Groups > alt.comp.os.windows-11 > #18452

Re: Pictures with transparent background as a desktop wallpaper

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On Wed, 4/16/2025 3:45 PM, Luca wrote:
> Andy Burns:
> 
>> Luca wrote:
>>
>>> Is it possible to select a picture with transparent backgraund as a desktop
>>> wallpaper and actually see the transaparency with respect to the desktop
>>> colour?
>>
>> If you've selected a background image, you can't set a background 
>> colour, can you?
>  
> 
> Yes we can. Background image (or folder for presentation) and background
> colour are both to be selected.
> 

Not even CoPilot would address your issue. The issue was avoided entirely,
as to the definition of transparency handling. As far as I'm concerned,
the black fill on your rendered desktop is "perfect". It's exactly what
should have happened from a graphics perspective. But that's a personal opinion,
based on how intuitive computers are.

An example of the primitive offered in older OSes, looks like this. Many people
try to write code in object oriented languages, only to find "boomer string definitions".
The OS at one time, was little better than assembler calls. Presumably the objective
in having crude handling like you've seen, is for backward compatibility with
any win32 code written with regard to this function.

   SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, "C:\\1.jpg", SPIF_SENDCHANGE);

   std::string s = "C:\\1.jpg";
   SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, (void*)s.c_str(), SPIF_SENDCHANGE);

Notice that the command makes absolutely no reference to graphics handling
issues or frippery. You get to specify a filename for the wallpaper, and that's it.
You'd need to ask Raymond Chen how that's handled, to find someone with enough
historical perspective to know how that was wedged in.

CoPilot says to use a third-party wallpaper manager, to achieve a desired effect.
On third-down, CoPilot punted.

So if you want a result, it looks like this:

    Arbitrary ==> User-controlled ==> folder of  ============> Slide show function
    folder of      image control      "cleaned,simple)
    images         and flattener       images
                  (assign and fill
                   transparency)

As an example of the arbitrary behavior of the Windows interface,
I tried to assign a solid color image to the login screen. The
file type was unsupported (apparently). I tried to feed it a .bmp !
Rather than throw an error and tell the user "this file type is unsupported",
the software absorbed my file pointer, and... the login screen was
a colorful solid black background. Which I have left, as a reminder of
just how clever computers are :-)

What has happened to you, is just a continuation of this policy.
Make a tactical error ? Get a "result". That is how it seems to work.

   Paul

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Thread

Pictures with transparent background as a desktop wallpaper Luca <luca@no.spam.invalid> - 2025-04-16 14:53 +0200
  Re: Pictures with transparent background as a desktop wallpaper "Alan K." <alan@invalid.com> - 2025-04-16 08:59 -0400
    Re: Pictures with transparent background as a desktop wallpaper Luca <luca@no.spam.invalid> - 2025-04-16 15:09 +0200
  Re: Pictures with transparent background as a desktop wallpaper Newyana2 <newyana@invalid.nospam> - 2025-04-16 10:00 -0400
    Re: Pictures with transparent background as a desktop wallpaper Luca <luca@no.spam.invalid> - 2025-04-16 16:12 +0200
      Re: Pictures with transparent background as a desktop wallpaper Newyana2 <newyana@invalid.nospam> - 2025-04-16 12:48 -0400
    Re: Pictures with transparent background as a desktop wallpaper Java Jive <java@evij.com.invalid> - 2025-04-16 17:05 +0100
      Re: Pictures with transparent background as a desktop wallpaper Newyana2 <newyana@invalid.nospam> - 2025-04-16 12:41 -0400
  Re: Pictures with transparent background as a desktop wallpaper Andy Burns <usenet@andyburns.uk> - 2025-04-16 15:50 +0100
    Re: Pictures with transparent background as a desktop wallpaper Luca <luca@no.spam.invalid> - 2025-04-16 21:45 +0200
      Re: Pictures with transparent background as a desktop wallpaper Newyana2 <newyana@invalid.nospam> - 2025-04-16 17:22 -0400
        Re: Pictures with transparent background as a desktop wallpaper Luca <luca@no.spam.invalid> - 2025-04-17 12:31 +0200
          Re: Pictures with transparent background as a desktop wallpaper Andy Burns <usenet@andyburns.uk> - 2025-04-17 11:42 +0100
            Re: Pictures with transparent background as a desktop wallpaper Paul <nospam@needed.invalid> - 2025-04-17 10:34 -0400
              Re: Pictures with transparent background as a desktop wallpaper Andy Burns <usenet@andyburns.uk> - 2025-04-17 15:37 +0100
      Re: Pictures with transparent background as a desktop wallpaper Paul <nospam@needed.invalid> - 2025-04-16 23:53 -0400
        Re: Pictures with transparent background as a desktop wallpaper Luca <luca@no.spam.invalid> - 2025-04-17 12:38 +0200

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