WritePixel

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ImaginaryHuman

You'd actually be better off doing something like:

local a:TPixmap=LoadPixmap("Pic.png")
a=ConvertPixmap(a,PF_RGBA8888)
local b:Byte Ptr=PixmapPixelPtr(a,0,0)
local c:Int=PixmapPitch(a)

'then e.g.

a[50+(50*c)]=$FF              'write one color component at the 50th component on line 50

Ie use pointers to write the bytes/integers in your preferred format - although this would potentially break if the pixmap system is changed somehow.