Getcolor query

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<edit>Blitz+
using <Graphics 320,240,16,0>
the following code returns 248,252,248
I expected 255,255,255
can anyone help me with why this happens?

using <Graphics 320,240,32,0>
it returns 255,255,255
but white is white in 16 bits, surely?

Open in online IDE

Graphics 320,240,16,0
SetBuffer BackBuffer() 
Color 255,255,255
Rect 10,10,100,100,1
GetColor 11,11
Text 10,200, " R:" + ColorRed() + " G:" + ColorGreen() + " B:" + ColorBlue() 
Flip  
WaitKey()
End