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Resize and save bitmaps

Posted on 2000-02-29
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Last Modified: 2010-05-18
For example, a 640x480 bitmap is loaded into a TImage, how can I save the picture into a new bitmap file of a dimension of 320x240 pixels?  Example code expected.
(D2)
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Question by:yingkit
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6 Comments
 
LVL 1

Expert Comment

by:wmckie
ID: 2567972
I can't answer your question but take a look at Earl Glynn's site:

http://www.efg2.com/lab/

He has a large number of examples of manipulating images and links.

Good luck - Walter McKie
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LVL 27

Accepted Solution

by:
kretzschmar earned 50 total points
ID: 2567988
hi yingkit,

you can use the stretchdraw-method like

DestBitmap := TBitmap.Create;
DestBitmap.Width := 320;
DestBitmap.Height := 240;
DestBitmap.Canvas.StretchDraw(Rect(0,0,320,240),SourceBitmap);
DestBitmap.SaveToFile('AFileName.bmp');

meikl
0
 

Expert Comment

by:Vovbager
ID: 2567990
hi vin
try to use this code

var NewBitmap: TBitmap;
begin
  NewBitmap:=TBitmap.Create;
  NewBitmap.Width:=320;
  NewBitmap.Height:=240;

  StretchBlt(NewBitmap.Canvas.Handle, 0,0,320,240, Image1.Canvas.Handle,0,0,640,480,SRCCOPY);
  NewBitmap.SaveToFile(FileName);
  NewBitmap.Free;
end;

end;

vov
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Author Comment

by:yingkit
ID: 2568026
Hi vov,
Only a 320x240 *blank* bitmap is generated.  Is there something wrong with the code?
0
 

Expert Comment

by:Vovbager
ID: 2568085
you must load source bitmap into the Image1
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Author Comment

by:yingkit
ID: 2568094
Although meiki submits as comment, the code works fine.
Also, meiki submitted first.
Thank you all !!
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