Solid colours next to eachother representing the whole hsl model's hue range. Linear blending in between the steps. By scaling the transitions to 1 px high each, it renders as gradient were used -at 100% zooming on some renderers, like inkscape's.
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test image 7 free icon was designed by Lazur URH for icons Png and presented to its users.
Lazur URH
2/22/2018