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Using P5.js library, the PNG files I create display a 1 pixel wide line extending across the horiz y axis of the image. If I zoom into the PNG image, the line becomes very distinct. It is a different shade, and stands out. It only seems to occur whenever I apply a gradient using P5 library. I might encounter the same problem while using Processing. I found a discussion from last year that refers to this problem.
https://forum.processing.org/two/discussion/comment/9365/#Comment_9365