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 ImageResize with transparent background

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T O P I C    R E V I E W
Dscho Posted - Aug 20 2014 : 10:41:45
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
2   L A T E S T    R E P L I E S    (Newest First)
Dscho Posted - Aug 20 2014 : 23:20:16
Thanks for your reply, thats the solution.

Best regards
Dscho
w2m Posted - Aug 20 2014 : 16:27:52
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