procedure TForm1.Button1Click(Sender: TObject);
var
  r: TPSDGraphic;
begin
   r := TPSDGraphic.Create;
   r.LoadFromFile( 'c:\1.psd' );
   Image1.Picture.Bitmap.Assign( r );
   r.Free;
end;

• TIFF images (*.tif; *.tiff)
• GFI fax images (*.fax)
• SGI images (*.bw, *.rgb, *.rgba, *.sgi)
• Autodesk images files (*.cel; *.pic)
• Truevision images (*.tga; *.vst; *.icb; *.vda; *.win)
• ZSoft Paintbrush images (*.pcx, *.pcc; *.scr)
• Kodak Photo-CD images (*.pcd)
• Portable pixel/gray map images (*.ppm, *.pgm, *.pbm)
• Dr. Halo images (*.cut, *.pal)
• CompuServe images (*.gif)
• SGI Alias/Wavefront images (*.rla, *.rpf)
• Standard Windows bitmap images (*.bmp, *.rle, *.dib)
• Photoshop images (*.psd, *.pdd)
• Paintshop Pro images (*.psp)
• Portable network graphic images (*.png)

uses
  {...,} Graphics, PNGImage, PngToBmp;

procedure Convert;
var
  Png: TPNGImage;
  Bmp: TBitMap;
begin
   Png := TPNGImage.Create;
   Bmp := TBitMap.Create;
   Png.LoadFromFile( 'image.png' );
   Bmp.SetSize( Png.Width, Png.Height );
 
   PngToBmp( Png, Bmp );
 
   Bmp.SaveToFile( 'image.bmp' );
   Png.Free;
   Bmp.Free;
end;