Chopping images without gravity

[t94j0]

Hello,
I have an array of (x,y) coordinate points in python and I would like to remove pixels that correspond to those coordinates. This is my first time using imageMagick, so I'm having some trouble. Right now, I'm using

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convert -chop 1x1+x+y input.png output.png

, but chop moves the image in a direction. Is there a way to chop and keep the part that was chopped transparent?

EDIT: I am using Version: ImageMagick 6.9.4-5 Q16 x86_64 on Mac.

[fmw42]

draw a singe tranparent pixel at the coordinates you want

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convert yourimage.suffix -fill none -draw "matte X,Y point" result.png

where x,y is the point to make transparent.

If you have a list of points, you can make a string or file (unix syntax)

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string="matte x1,y1 point matte x2,y2 point ... matte xN,yN point"
convert yourimage.suffix -fill none -draw "$string" result.png

textfile.txt is as below

matte x1,y1 point
matte x2,y2 point
...
matte xN,yN point

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cat textfile.txt | convert yourimage.suffix -fill none -draw "-" result.png

[t94j0]

That works perfectly, thanks!