enter image description here

I used two shades of red to run this gradient from one end to another and then black and white. Blend modes were CIELAB under linear RGB and 32-bit floating point precision. Banding occurred when I down converted to 16-bit integer gamma RGB (i.e. sRGB). This small issue aside, I still think that I made the gradient appear like a solid red stripe, but this is something that I can't measure given the specification.

Can you measure perception by means other than asking?

Edit: removed a picture without clear distinction of colors. Changed the first one too.

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    Yes, you can calulate something called CIELAB ΔE* 2000. Then compare it to surrounding parts. – joojaa Dec 31 '19 at 12:02
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    Possibly related question here: graphicdesign.stackexchange.com/questions/15494/… – Billy Kerr Dec 31 '19 at 12:25
  • The red gradient is fairly perceptible to me. – Scott Dec 31 '19 at 21:02
  • @Scott there is a quite big variability in sensitivity to color change. But even so this picture has some problems due to its digital nature some monitors are better and some calibrated and or miscalibrated – joojaa Jan 1 at 8:40

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