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 IEConvertToThumbnail: Transparent background?
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PeterPanino

933 Posts

Posted - Sep 02 2024 :  02:18:58  Show Profile  Reply
The IEBitmap helper function ImageEnViewInsertInternal.IEBitmap.IEConvertToThumbnail can be helpful.

However, the parameter cBGColor (the color of the image behind the shadow) is a solid color. How do we make it transparent?

xequte

38616 Posts

Posted - Sep 02 2024 :  02:41:19  Show Profile  Reply
Hi Peter

Unfortunately, that is an old method and should be completely rewritten as it is based on TCanvas rather than TIECanvas, so it does not support things like transparency. I'll look at improving it for a later update.

Nigel
Xequte Software
www.imageen.com
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PeterPanino

933 Posts

Posted - Sep 02 2024 :  02:52:41  Show Profile  Reply
I've tried fixing the problem with this code:

var bmp := TIEBitmap.Create(ImageEnView1.IEBitmap);
  try
    // Resize the current bitmap image to 250x250 with a shadow and no border
    bmp.IEConvertToThumbnail(
      250, 250,        // MaxX, MaxY
      True,            // StretchSmall
      rfLanczos3,      // QualityFilter
      False,           // bAddBorder
      clBlack,         // cBorderColor
      TRUE,            // bAddShadow
      5,               // iBlurRadius
      1,               // iShadowOffset
      clBlack,         // cShadowColor
      clFuchsia);      // cBGColor

    bmp.SetTransparentColors(clFuchsia, clFuchsia, 0);
    ImageEnView1.IEBitmap.Assign(bmp);
    ImageEnView1.Update;
  finally
    bmp.Free;
  end;


However, it does not work because the shadow color overlaps the Fuchsia color.

Is it possible to make the cBGColor transparent despite the shadow or to make the whole shadow semi-transparent?

By the way, a "Buttonize" effect would be helpful, where the thumbnail looks like a button with 3-dimensional beveled edges.
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xequte

38616 Posts

Posted - Sep 02 2024 :  17:42:33  Show Profile  Reply
Hi Peter

We will look into that in a future version.

Nigel
Xequte Software
www.imageen.com
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