save image to a txt file?

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fil=WriteFile("image.txt")

WriteLine fil,ImageWidth(img)
WriteLine fil,ImageHeight(img)
SetBuffer ImageBuffer(img)
For x=1 to ImageWidth(img)
 For y=1 to ImageHeight(img)
  WriteLine fil,ReadPixel(x,y)
 Next
Next

fil=ReadFile("image.txt")

w=ReadLine$(fil)
h=ReadLine$(fil)
img=CreateImage(w,h)
For x=1 to w
 For y=1 to h
  WritePixel x,y,Readline$(fil)
 Next
Next