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 Topic  |
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Ken
USA
2 Posts |
 Posted - Aug 09 2011 : 11:22:14
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SaveToPDF, File Size
ImageEn 3.1.2, D XE
I have TIFFs that I convert to PDFs. The resulting PDFs are normally about 30KB to 60 KB. However, sometimes I need to add text to the image before converting it to a PDF. Those PDFs are enormous - about 20 MB to 60 MB. I need to be able to produce smaller PDFs when I have to add text. Here's my relevant code:
if StampText <> '' then
StampImageWithSpecialText(MyImage, StampText);
MyImage.IO.Params.PDF_Compression:= ioPDF_G4FAX; // G4Fax compression
MyImage.IO.SaveToPDF;
procedure StampImageWithSpecialText(MyImage : TImageENVect; StampText : string);
procedure IETextOut(Canvas: TCanvas; x,y:integer; angle:integer; const Text: String);
var
LogFont : TLogFont;
begin
with Canvas do
begin
GetObject(Font.Handle, SizeOf(TLogFont), @LogFont);
LogFont.lfEscapement := angle*10;
LogFont.lfQuality:=3;
Font.Handle := CreateFontIndirect(LogFont);
TextOut(x, y, Text);
end;
end;
begin
MyImage.LayersAdd; // add a new layer
MyImage.Proc.Fill(CreateRGB(255,255,255));
MyImage.Bitmap.Canvas.Font.Name := 'Arial';
MyImage.Bitmap.Canvas.Font.Size := 24;
MyImage.Bitmap.Canvas.Font.Size := trunc(24 * (MyImage.Bitmap.width/2544));
MyImage.Bitmap.Canvas.Font.Color := clBlack;
IETextOut(MyImage.Bitmap.Canvas, trunc(300 * (MyImage.Bitmap.width/2544)), 0, 0, StampText); // draw text on second layer
MyImage.Proc.Rotate(180);
IETextOut(MyImage.Bitmap.Canvas, trunc(300 * (MyImage.Bitmap.width/2544)), 0, 0, StampText);
MyImage.Proc.SetTransparentColors(CreateRGB(255, 255, 255), CreateRGB(255,255, 255), 0); // remove the white, making it as transparent
MyImage.LayersMergeAll;
end;
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I figured out a workaround. I just save to a TIF and load from the TIF, right before SaveToPDF.
if (StampText <> '') then
begin
StampImageWithSpecialText(MyImage, StampText);
MyImage.IO.SaveToFile(FileName + '.tif');
MyImage.IO.LoadFromFile(FileName + '.tif');
end;
MyImage.IO.Params.PDF_Compression:= ioPDF_G4FAX; // G4Fax compression
MyImage.IO.SaveToPDF;
Still, there has to be a better solution. Or, SaveToPDF has a bug, or needs more documentation.
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After further testing, I have determined that adding SaveToFile and LoadFromFile just slows the processing down too much when the pdf has too many pages. So I'd still appreciate some other ideas.
Thanks,
George
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fab
1310 Posts |
Posted - Aug 09 2011 : 14:06:20
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The method LayersMergeAll converts implicitly the image to RGB (24 bit), so the compression method ioPDF_G4FAX is no more applicable.
You should re-convert back the image to black/white executing:
...
MyImage.LayersMergeAll;
MyImage.Proc.ConvertToBWThreshold(); // other ways available
... |
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George
USA
1 Posts |
Posted - Aug 11 2011 : 10:54:47
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I am taking over from Ken here.
I added MyImage.Proc.ConvertToBWThreshold() after LayersMergeAll, and I removed the SaveToFile/LoadFromFile.
It works, but it isn't any faster. I can generate a 38 page pdf without calling StampImageWithSpecialText in about 5 seconds. It still takes about 22 seconds to generate the same 38 page pdf with calling StampImageWithSpecialText.
Is there anything else I can do?
Thanks,
George |
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fab
1310 Posts |
Posted - Aug 11 2011 : 14:50:51
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>Is there anything else I can do?
You could write directly over the main bitmap, instead of using layers.
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