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    <p>I have used the following scheme to convert in-memory images to TBitmap:</p> <p>1) Fill TBMPHeader structure</p> <pre><code> TBMPHeader = packed record bmfHeader: TBitmapFileHeader; bmiHeader: TBitmapInfoHeader; bmiColors: {depends on image format, may be absent}; end; </code></pre> <p>2) Write BMPHeader + Image Data to MemoryStream</p> <p>3) Load TBitmap from MemoryStream using TBitmap.LoadFromStream</p> <p>You seems to have bmiHeader structure filled already. Add bmfHeader and (maybe) bmiColors.</p> <p>Here is the code I used to convert 256-color grayscale in-memory images to TBitmap (many years ago, sorry, so no details):</p> <pre><code>procedure TksImage.CopyToBitmap(Bitmap: TBitmap); var Stream: TStream; begin Stream:= TMemoryStream.Create; try SaveToStream(Stream); Stream.Position:= 0; Bitmap.LoadFromStream(Stream); finally Stream.Free; end; end; procedure TksImage.SaveToStream(Stream: TStream); type TBMPHeader = packed record bmfHeader: TBitmapFileHeader; bmiHeader: TBitmapInfoHeader; bmiColors: array[0..255] of TRGBQuad; end; var BMPHeader: TBMPHeader; N: LongWord; I: Integer; begin FillChar(BMPHeader, SizeOf(BMPHeader), 0); with BMPHeader.bmfHeader do begin bfType:= $4D42; {'BM'} bfOffBits:= SizeOf(BMPHeader); if FChannels = 4 then Dec(bfOffBits, SizeOf(BMPHeader.bmiColors)); bfSize:= bfOffBits + LongWord(FImageSize); end; with BMPHeader.bmiHeader do begin biSize:= SizeOf(BMPHeader.bmiHeader); biWidth:= FWidth; biHeight:= FHeight; biPlanes:= 1; biBitCount:= 8 * FChannels; biCompression:= BI_RGB; biSizeImage:= FImageSize; {((((biWidth * biBitCount) + 31) and not 31) shr 3) * biHeight;} end; N:= 0; for I:= 0 to 255 do begin LongWord(bmpHeader.bmiColors[I]):= N; Inc(N, $010101); end; Stream.Write(BMPHeader, BMPHeader.bmfHeader.bfOffBits); Stream.Write(FImageData^, FImageSize); end; </code></pre>
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    1. COSerg, when bmiColors is removed from the record, it works like a charm :) Thank you !
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    2. COdoes this work for PNG images with keeping its transparency?
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      1. USSara S.
 

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