Series Transparency setting is ignored when Exporting

[Kevin]

When exporting a chart to an image (e.g. to PNG, JPEG) the series Transparency setting is ignored. The series are output with no transparency i.e. opaque. This is with TeeChart 8.02.

I have tried various series types including bubble and gantt with no success.

Is there a way to get transparency to work when exporting?

[Narcís]

Hi Kevin,

Yes, you can use Bitmap exporting for transparency. JPEG export doesn't support it.

[Kevin]

It seems that Bitmap is the only export format that supports Transparency. Is that correct?

Why can't other formats support transparency? e.g. PNG

[Pep]

Hi Kevin,

yes, export to PNG also keeps the transparency applied.

[Janusz_Cichocki]

I used Teechart v. 7.0 (Delphi 7.0). When exporting BMP it was OK.
with Teechart v. 8.02 (Delphi 7.0) is doesn't work. Transparency is only on the screen. After export to BMP format there is no tranparency.
What has changed ?
Janusz

[Narcís]

Hi Janusz,

This works fine for me here using v8.03 release candidate. I've just sent you the URL to download it. Could you please check if this works fine at your end?

Thanks in advance.

[Janusz_Cichocki]

version 8.03.11357
Series1 : TWindRoseSeries
I save screen using :
Chart1.SaveToBmpFile (Name)
There is no tranparency in BMP file
(Print Screen works OK)
Janusz

[Narcís]

Hi Janusz,

I could reproduce the problem here, I'll add it to the defect list to be reviewed. I've checked that using code above doesn't work in v7 either.

Code: Select all

procedure TForm1.Button1Click(Sender: TObject);
begin
  Chart1.SaveToBitmapFile('c:\temp\wr.bmp');
end;

Anyway, you can use code below, I've checked that this exports a bitmap with transparency.

Code: Select all

uses TeeBMPOptions;

procedure TForm1.Button1Click(Sender: TObject);
var tmp: TBMPExportFormat;
begin
  tmp:= TBMPExportFormat.Create;
  tmp.Panel:=Chart1;
  tmp.SaveToFile('c:\temp\Chart1BMP.' + tmp.FileExtension);
  //Chart1.SaveToBitmapFile('c:\temp\wr.bmp');
end;

[Janusz_Cichocki]

Hi,
I am so glad. Now it works prefect. I have checked out PCX format
and it keeps transparency too ! Thank you for quick answer
Janusz