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 Resample vs LoadFromFile & AutoFit

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T O P I C    R E V I E W
egrobler Posted - Jan 02 2013 : 05:02:29
Hi

I load a large image into TImageEn with the same aspect ration using the AutoFit property.
However, the image quality is poor but if I resample the image first the quality is fine.

Please see attached screenshot, the image to the left is resampled.

My question is: how can I AutoFit an image with good quality?

Regards
Eric
2   L A T E S T    R E P L I E S    (Newest First)
egrobler Posted - Jan 02 2013 : 07:16:23
Hi William,

Thank you very much.
Thanks looks much better :-)

Regards
Eric
w2m Posted - Jan 02 2013 : 06:59:29
The ZoomFilter property specifies the filter to apply in zoom-in (Zoom property) operations. The fastest way to zoom a picture is to set ZoomFilter to rfNone (default). In your case AutoFit is a form of zoom so set the ZoomFilter before loading the image.

If rfHermite givess you the best result as shown in your code then call ImageEn1.ZoomFilter := rfHermite:

procedure TForm14.FormCreate(Sender: TObject);
begin
  ImageEn1.ZoomFilter := rfHermite;
  ImageEn2.ZoomFilter := rfHermite:
  ResampleStreamToStream();
  ImageEn1.IO.LoadFromFileJpeg();
  ImageEn2.IO.LoadFromFileJpeg();
end;


William Miller

Email: w2m@frontiernet.net
EBook: http://www.imageen.com/ebook/
Apprehend: http://www.frontiernet.net/~w2m/index.html