More pictures modified in Delphi ( the formula for the color is showed below )
(Some pictures was reducted..)

 


Britney Spears

  with some imperfection:
   
If if (g<r) and (b<r) then cc:=37; if r-cc > 0 then r:=r-cc;
if g-cc > 0 then g:=g-cc; if b-cc > 0 then b:=b-cc;

 

Kelly Clarkson

If (r in [30..130]) and (g in [40..104]) and (b in [10..100]) then
  cc:=53; If b<255-cc then b:=b+cc; If g<255-cc then g:=g+cc;
Full Size

 


Jessica Andrews


 

If ((x>143) and (y>174) and (x<151) and (y<185)) then
..
c:=Form3.Image1.Canvas.Pixels[x-12, y];
b := GetBValue(c); g := GetGValue(c); r := GetRValue(c);
 
Christina Aguilera If (r<113) and (g<112) and (b<95) and (g-r<10) then
  cc:=25; If r>cc then dec(r,cc); If g>cc then dec(g,cc)
  If b>cc then dec(b,cc)  Full Size


 


Christina Aguilera
 

If (r>g) and (r>b) and (r in [30..200]) and (r-g>34) and (r-b>34) then
 cc:=22; If r+cc < 256 then r:=r+cc;