The same image rendered with different os/hardware will almost always look different.
Different operating systems and monitors have different default gamma curves for rendering brightness and black levels. Monitors are most likely either uncalibrated, or _can't be calibrated_ to render a greyscale with just 64 brightness levels distinctly.
TFA is calling attention to "posterization" in their portrait backgrounds. They expected the grey background to have a smooth gradient, but, depending on your monitor, you should see visual jagged stair-steps between different grey levels.
When an image uses a color palette that's insufficiently variable to render the original image colors with high fidelity, that's "posterization."
(I paid for my college doing high-end prepress and digital image services, and got to work with a ton of really talented photographers who helped me see what they were seeing)
Different operating systems and monitors have different default gamma curves for rendering brightness and black levels. Monitors are most likely either uncalibrated, or _can't be calibrated_ to render a greyscale with just 64 brightness levels distinctly.
TFA is calling attention to "posterization" in their portrait backgrounds. They expected the grey background to have a smooth gradient, but, depending on your monitor, you should see visual jagged stair-steps between different grey levels.
When an image uses a color palette that's insufficiently variable to render the original image colors with high fidelity, that's "posterization."
(I paid for my college doing high-end prepress and digital image services, and got to work with a ton of really talented photographers who helped me see what they were seeing)