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how to shrink a jpeg image?

Posted on 2002-03-07
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Last Modified: 2013-11-19
i have a big area jepg image , i want it shrink into
smaller, how to realize it in program ?

for example , a 200 * 200 jpeg image shrink into a
100 * 100 jpeg image
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Question by:escaper
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4 Comments
 
LVL 27

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by:kretzschmar
ID: 6847201
convert it to a bitmap,
shrink the bitmap (maybe with bitblt)
convert back to jpeg
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DrDelphi earned 50 total points
ID: 6848414
var bmp:Tbitmap;
    jpg:TJpegImage;
begin
   jpg:=TJpegimage.create;
   Bmp:=Tbitmap.create;
   with bmp do
   begin
     height:=100;
     width:=100;
   end;
   Jpg.loadFromfile('z:\parsonsd\maya.jpg');
   bmp.Canvas.StretchDraw(Bmp.canvas.ClipRect,jpg);
   jpg.assign(bmp);
   jpg.SaveToFile('z:\new.jpg');
   freeandNil(jpg);
   FreeAndNil(bmp);
end;
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LVL 27

Expert Comment

by:kretzschmar
ID: 6848433
yep, thats it
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LVL 6

Expert Comment

by:DrDelphi
ID: 6848460
<g>

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