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Non-essential retail in nineteenth-century London
- jfim 6y agoI wonder what the rainbow effect is. Is it a color in the original or some kind of scanning artifact?
- JonathonW 6y agoScanning artifacts; those are moiré patterns caused by the interaction of the scanner’s (or camera’s) color filter array with fine detail in the source image (stippling or striping or whatever the original image did to convey shading in a two-color print). https://www.imatest.com/solutions/moire/ https://www.imatest.com/solutions/moire/