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This was caused by allowing the stage to be set to fractional coordinates. For example, the stage might be positioned at `x: 142.22255, y: 488.79`. When positioned like this, the canvas will be slightly misaligned with its native pixel grid. The browser does its best, but this causes tiny scaling artifacts throughout the image. It's most noticeable where there is a sharp contrast. This behaviour was introduced while troubleshooting an issue with degraded quality when saving canvas to gallery. Turned out the stage position was unrelated to that issue, but I didn't realize that the change would cause this other type of problem. The fix is super simple - ensure we floor stage coords when setting the manually. Konva never sets the position to fractional coordinates itself. For example, while dragging the stage, Konva sets the stage coordiantes itself, and they are always integers.