ImageEn Forum - Transparent 32-bit PNG

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Transparent 32-bit PNG

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kbriggs

USA
2 Posts

Posted - Sep 24 2013 : 19:29:22

I've got an old (version 3.0.5) license of ImageEn. I cannot figure out how to create a 32-bit transparent PNG image. This is my code:

ie := TImageEnView.Create(nil);
ie.EnableAlphaChannel := True;
ie.IO.IEBitmap.Width := 100;
ie.IO.IEBitmap.Height := 100;
ie.LegacyBitmap := False;
ie.IO.IEBitmap.PixelFormat := ie32RGB;
ie.IO.Params.BitsPerSample := 8;
ie.IO.Params.SamplesPerPixel := 4;
ie.IO.SaveToFilePNG('C:\Temp\test.png');
ie.Free;

The result is a 24-bit, 3 SamplesPerPixel image with a white background, not a 32-bit, 4 SamplesPerPixel image as desired. What am I doing wrong here?

w2m

USA
1990 Posts

Posted - Sep 25 2013 : 08:46:07

I do not think you should set ie.IO.IEBitmap.PixelFormat := ie32RGB.

This is what I do to create a 32-bit transparent bitmap or png:

ImageEnView.IO.Params.BitsPerSample := 8;
ImageEnView.IO.Params.SamplesPerPixel := 4;
iRGB := ImageEnView.IEBitmap.Pixels[0, ImageEnView.IEBitmap.Height - 1];
ImageEnView.Proc.SetTransparentColors(iRGB, iRGB, 0);

Hope this helps.
William Miller
Adirondack Software & Graphics
Email: w2m@frontiernet.net
EBook: http://www.imageen.com/ebook/
Apprehend: http://www.frontiernet.net/~w2m/index.html

kbriggs

USA
2 Posts

Posted - Sep 25 2013 : 12:10:30

William,

That worked. Thanks!

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