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Incus J

How to set JPEG quality in Firemonkey?

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I'm having difficulty saving a JPEG file in Firemonkey.  Here's the code:

procedure SaveImage(bmp:TBitmap; filename:string);
var
  vOpt:TBitmapCodecSaveParams;
begin
  vOpt.Quality:=20; //Quality setting ignored? :(
  bmp.SaveToFile(filename,@vOpt);
end;

On Windows everything seems OK, however when the program is compiled for MacOS the resulting JPEG file is not at the Quality specified.  The image quality setting seems to be ignored.  How do I set the JPEG output quality on MacOS?  (Delphi Tokyo 10.2.3)

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