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Get pixel color of a jpg in a TImage

Posted on 2013-11-07
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Last Modified: 2013-11-19
Hi Experts,

I need to get the pixel color of a jpg image inside of TImage. How can I do this ?

Something like this:

var
  pixel_color    : TColor;
begin
  pixel_color := Image1.Canvas.Pixels[0, 0];
end;

But this code only works to BMP image.

I am using Delphi Xe4

Thanks for some help
Alexandre
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Question by:alpires
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1 Comment
 
LVL 27

Accepted Solution

by:
Sinisa Vuk earned 2000 total points
ID: 39632236
Here is small example:
var
  jpeg: TJPEGImage;
  bmp: Tbitmap;
begin
  jpeg := TJPEGImage.Create;
  try
    jpeg.LoadFromFile('c:\test.jpg');
    bmp := Tbitmap.Create;
    try
      bmp.PixelFormat := pf24bit;
      bmp.Width := jpeg.Width;
      bmp.Height:= jpeg.Height;
      bmp.Assign(jpeg);
      //access pixel
      ShowMessage(IntToHex(Cardinal(bmp.Canvas.Pixels[1, 1]), 8));
    finally
      bmp.Free;
    end;
  finally
    jpeg.Free;
  end;

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