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How to resize QR code from vector graphic without grayish zones?

I'm trying to resize a vector graphic QR code in Gimp but it always creates an additional color in it gray. I want it to be pure black and white with perfect corners like in the original image on the left.

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I tried opening the vector graphic (svg) with Inkscape and exporting a png at 200x200 px but I still get the same grayish result above. I also tried setting the DPI to a full integer like 20, instead of 19.81, which resulted in 202x202 but still same problem.

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Thanks to Rafael for solving my problem, so I know now I have to count the number of squares in my QR which was 57 in my case and I choose the number of pixels per square, say 4px, that makes 228x228 the proper "minimum" size. Now I just wonder why Inkscape would still add light gray "shadows" to the result.

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