A picture :-))
I hope you do realize that for a PDF like the last one that I uploaded here we should expect some "distortions" or irregularities in the rendering process. I can't understand how the model you explained above works when you mix colour and text.
That means that where you have B on W text you see a characters with rendered with different DPI that when you have coloured text.... so I do not think that for us who do not have the device is very easy to figure that out...
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