Работа с Photoshop

uses
  ComObj, ActiveX, PhotoShopTypeLibrary_TLB;

var
  PS: IPhotoShopApplication;
  Unknown: IUnknown;
begin
  Result := GetActiveObject(CLASS_PhotoshopApplication, nil, Unknown);
  if (Result = MK_E_UNAVAILABLE) then
    PS := CoPhotoshopApplication.Create
  else
  begin
    { make sure no other error occurred }
    OleCheck(Result);
    OleCheck(Unknown.QueryInterface(IPhotoShopApplication, PS));
  end;
  PS.Visible := True;
end;

Source: Delphi Knowledge Base: http://www.baltsoft.com/
ID: 04484