TPrintPreview only in black&white

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TPrintPreview only in black&white

Postby Bronius » September 29th, 2005, 1:05 pm

Hello,

Can You help me?
I'd like remove colors from PrintPreview using BeginEdit. Is it possible?

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Postby Kambiz » September 29th, 2005, 2:29 pm

I have no idea! :roll:
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Postby Bronius » October 13th, 2005, 8:17 pm

Hello, Kambiz,

I found solution of my black&white problem, but in result I loose quality.

In attachment there is sample project.
Can I ask You to take a look :oops: ?

May be, You have any idea...

Thank You!
-----------------------------------
Bronius
Attachments
Result.jpg
Preview in Black&White
Result.jpg (55.82 KiB) Viewed 1369 times
Source.jpg
Preview with colors
Source.jpg (56.52 KiB) Viewed 1369 times
Sample.zip
Sample project
(15.2 KiB) Downloaded 87 times
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Postby Kambiz » October 13th, 2005, 10:31 pm

Because of converting metafile to raster graphic, the lose of quality with a zoom factor other 100% is obvious.

By the way, the following code is more optimized.

Code: Select all
procedure TForm1.Button1Click(Sender: TObject);
var
  BM: TBitmap;
begin
  Button1.Enabled := False;
  if PrintPreview1.BeginEdit(1) then
    try
      BM := TBitmap.Create;
      try
        BM.Width := PrintPreview1.Pages[1].Width;
        BM.Height := PrintPreview1.Pages[1].Height;
        BM.PixelFormat := pf1bit;
        BM.Canvas.Draw(0, 0, PrintPreview1.Pages[1]);
        PrintPreview1.Canvas.StretchDraw(PrintPreview1.PageBounds, BM);
      finally
        BM.Free;
      end;
    finally
      PrintPreview1.EndEdit;
    end;
end;
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Postby kokkoras » October 21st, 2005, 10:35 pm

I think removing colors from a print out is a matter of the printer's driver. I mean, you can propably force your color printer to print on gray scale or black and white.

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