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 ImageResize with transparent background		  New Topic  Reply to Topic
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Dscho

9 Posts
Posted - Aug 20 2014 :  10:41:45  Show Profile  Reply
Hi,

i want to use ImageResizre with tramsparent background, but i always get a white background.
After Imageresize i want to copy a gradient image as backgound into a layer.

I use the following code - without result:


EnView.EnableAlphaChannel := True;
EnView.Proc.ImageResize(new_width, new_Height, hAlign, vAlign,0);
EnView.Proc.SetTransparentColors(CreateRGB(255,255,255),CreateRGB(255,255,255),0);


Best Regards
Dscho

w2m

USA
1990 Posts
Posted - Aug 20 2014 :  16:27:52  Show Profile  Reply
Are you positive that the bitmap has white pixels, or are most of the "white pixels" near white?

One way to insure setting the transparent color correctly is to get the color of the bitmap's lower-left pixel and use that for the transparent color:
var
  iRGB: TRGB;
iRGB := ImageEnView1.IEBitmap.Pixels[0, ImageEnView1.IEBitmap.Height - 1];
ImageEnView1.Proc.SetTransparentColors(iRGB, iRGB, 0);


Bill Miller
Adirondack Software & Graphics
Email: w2m@hughes.net
EBook: http://www.imageen.com/ebook/
Custom Commercial ImageEn Development
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Dscho

9 Posts
Posted - Aug 20 2014 :  23:20:16  Show Profile  Reply
Thanks for your reply, thats the solution.

Best regards
Dscho
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