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Resize a bitmap

 
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Alfred Thomas
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PostPosted: Wed Oct 19, 2005 2:20 pm    Post subject: Resize a bitmap Reply with quote



Hi all

I am writing a component that needs to read a JPEG into a TJpegImage, convert it to a TBitmap and then make part of the image smaller.
The problem is that when i do the resize, the resulting image quality is very bad. It seems as if the pixelFormat changed to 16bit, but I tried setting it to 24bit with no effect.
Here is the code I use to resize:

OffscreenImage->Width = sourceRect.Width() / scaleFactor;
OffscreenImage->Height = sourceRect.Height() / scaleFactor;
StretchBlt(OffscreenImage->Canvas->Handle, 0, 0,
OffscreenImage->Width, OffscreenImage->Height,
sourceRect.Top, sourceRect.Width(), sourceRect.Height(), SRCCOPY);

Any help would be appreciated.

Alfred
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Michel Leunen
Guest
PostPosted: Wed Oct 19, 2005 6:16 pm    Post subject: Re: Resize a bitmap Reply with quote


Alfred Thomas wrote:
Quote:
Hi all

I am writing a component that needs to read a JPEG into a TJpegImage, convert it to a TBitmap and then make part of the image smaller.
The problem is that when i do the resize, the resulting image quality is very bad.

Look at this thread with sample from Damon Chandler :
http://tinyurl.com/8u2cd

Michel
--
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Michel Leunen
mailto: see my homepage.
C++Builder, BCC5.5.1 Web site:
http://www.leunen.com/
----------------------------------------

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Alfred Thomas
Guest
PostPosted: Thu Oct 20, 2005 7:48 am    Post subject: Re: Resize a bitmap Reply with quote



Hi Michel

Thank you, that was exactly what I needed.

Michel Leunen <nospam (AT) noreply (DOT) please> wrote:
Quote:
Look at this thread with sample from Damon Chandler :
http://tinyurl.com/8u2cd



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