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    <p>It works for me:</p> <pre><code>procedure TForm1.Button1Click(Sender: TObject); var bm1, bm2: TBitmap; begin bm1 := TBitmap.Create; bm1.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp'); bm2 := TBitmap.Create; bm2.SetSize(bm1.Width, bm1.Height); bm2.Canvas.Brush.Color := clRed; bm2.Canvas.Pen.Style := psClear; bm2.Canvas.Ellipse(0, 0, bm2.Width, bm2.Height); Canvas.Draw(100, 100, bm1); Canvas.Draw(100, 100, bm2, 127); end; </code></pre> <p><a href="http://privat.rejbrand.se/blendimg1.png" rel="noreferrer">Sample 1 http://privat.rejbrand.se/blendimg1.png</a></p> <p>If you want more control, you can always do the processing manually:</p> <pre><code>procedure TForm1.Button1Click(Sender: TObject); type TRGB32Array = packed array[0..MaxInt div SizeOf(TRGBQuad)-1] of TRGBQuad; PRGB32Array = ^TRGB32Array; TScanline = TRGB32Array; PScanline = ^TScanline; var bm1, bm2, bm3: TBitmap; sc1, sc2, sc3: PScanline; i: Integer; j: Integer; var transp: real; const opacity = 0.29; begin transp := 1 - opacity; bm1 := TBitmap.Create; bm1.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp'); bm2 := TBitmap.Create; bm2.SetSize(bm1.Width, bm1.Height); bm2.Canvas.Brush.Color := clRed; bm2.Canvas.Pen.Style := psClear; bm2.Canvas.Ellipse(0, 0, bm2.Width, bm2.Height); bm3 := TBitmap.Create; bm3.SetSize(bm1.Width, bm1.Height); bm1.PixelFormat := pf32bit; bm2.PixelFormat := pf32bit; bm3.PixelFormat := pf32bit; for i := 0 to bm1.Height - 1 do begin sc1 := bm1.ScanLine[i]; sc2 := bm2.ScanLine[i]; sc3 := bm3.ScanLine[i]; for j := 0 to bm1.Width - 1 do with sc3^[j] do begin rgbBlue := round(transp*sc1^[j].rgbBlue + opacity*sc2^[j].rgbBlue); rgbGreen := round(transp*sc1^[j].rgbGreen + opacity*sc2^[j].rgbGreen); rgbRed := round(transp*sc1^[j].rgbRed + opacity*sc2^[j].rgbRed); end; end; Canvas.Draw(100, 100, bm3); end; </code></pre> <p><a href="http://privat.rejbrand.se/blendimg2.png" rel="noreferrer">Sample 2 http://privat.rejbrand.se/blendimg2.png</a></p> <p>You can for example let the background image be at 100 % opacity outside the ellipse:</p> <pre><code> ... for i := 0 to bm1.Height - 1 do begin sc1 := bm1.ScanLine[i]; sc2 := bm2.ScanLine[i]; sc3 := bm3.ScanLine[i]; for j := 0 to bm1.Width - 1 do if sc2^[j].rgbBlue + sc2^[j].rgbGreen + sc2^[j].rgbRed = 3*255 then sc3^[j] := sc1^[j] else with sc3^[j] do begin rgbBlue := round(transp*sc1^[j].rgbBlue + opacity*sc2^[j].rgbBlue); rgbGreen := round(transp*sc1^[j].rgbGreen + opacity*sc2^[j].rgbGreen); rgbRed := round(transp*sc1^[j].rgbRed + opacity*sc2^[j].rgbRed); end; end; ... </code></pre> <p><a href="http://privat.rejbrand.se/blendimg3.png" rel="noreferrer">Sample 3 http://privat.rejbrand.se/blendimg3.png</a></p> <p>Not to mention <a href="http://english.rejbrand.se/algosim/manual/pmproc/pmproc.html" rel="noreferrer">all other cool stuff you can do with pixmap manipulation</a>:</p> <pre><code> ... for i := 0 to bm1.Height - 1 do begin sc1 := bm1.ScanLine[i]; sc2 := bm2.ScanLine[i]; sc3 := bm3.ScanLine[i]; for j := 0 to bm1.Width - 1 do if sc2^[j].rgbBlue + sc2^[j].rgbGreen + sc2^[j].rgbRed = 3*255 then sc3^[j] := sc1^[j] else with sc3^[j] do begin rgbBlue := round(sin(transp*sc1^[j].rgbBlue + opacity*sc2^[j].rgbBlue)); rgbGreen := round(transp*sc1^[j].rgbGreen + opacity*sc2^[j].rgbGreen); rgbRed := round(transp*sc1^[j].rgbRed + opacity*sc2^[j].rgbRed); end; end; ... </code></pre> <p><a href="http://privat.rejbrand.se/blendimg4.png" rel="noreferrer">Sample 4 http://privat.rejbrand.se/blendimg4.png</a></p> <p>If you really don't want to do it manually, I just figured out, you can draw the ellipse on a copy of the first bitmap, and then blend these two bitmaps:</p> <pre><code>procedure TForm1.Button1Click(Sender: TObject); var bm1, bm2: TBitmap; begin bm1 := TBitmap.Create; bm1.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp'); bm2 := TBitmap.Create; bm2.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp'); bm2.Canvas.Brush.Color := clRed; bm2.Canvas.Pen.Style := psClear; bm2.Canvas.Ellipse(0, 0, bm2.Width, bm2.Height); Canvas.Draw(100, 100, bm1); Canvas.Draw(100, 100, bm2, 127); end; </code></pre> <p><a href="http://privat.rejbrand.se/blendimg5.png" rel="noreferrer">Sample 5 http://privat.rejbrand.se/blendimg5.png</a></p>
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    1. USAndreas Rejbrand
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    1. CO+1 Even better if it could be done with anti-aliasing!
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      1. USDavid Heffernan
    2. COThank you for large solution. Thank you again!
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      1. USuser558126
    3. COvery comprehensive set of examples! don't forget to free the bitmap objects though with try..finally, but I bet you already knew that ;)
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