Writing an image from ascii data

[open researcher]

I have a file, which has x , y coordinates of partical interactions (
something like this     2.309    -0.550
          -4.322   -2.111 )

I want to get an image out of this, like the pixel corresponding to 2.309 ,
-0.550 should get updated with some value.

How I should proceed ? (Should I import this ascii file as raw or something
?)

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