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    <p>It's because of <strong>sub-pixel artifacts</strong>. </p> <p>It is used also constructively nowadays to smooth text. This is because the screen is composed of red, green and blue sub-pixels, disposed in a vertical orientation. Note that the actual order may differ on some screens.</p> <pre><code>rgb|rgb|rgb ---+---+--- rgb|rgb|rgb ---+---+--- rgb|rgb|rgb </code></pre> <p>This means that in the navigation bar you have a disposition like the following:</p> <pre><code>blue | red | blue ---+---+---+---+---+---+---+--- b| b| b|r |r |r | b| b ---+---+---+---+---+---+---+--- b| b| b|r |r |r | b| b ^ ^ | Artifact caused by sub-pixels being far away (darker line) | Artifact caused by vicinity of sub-pixels (lighter line) </code></pre> <p>I have also created an image illustrating the typical pixel disposition in an lcd screen (rgb):</p> <p><img src="https://i.stack.imgur.com/oNGg3.png" alt="Sub-Pixel artifacts"></p> <p>you can see how on the first <em>transition</em>, when changing blue to orange, there is a green subpixel followed by a blue and by a red one, which are <strong>relatively close</strong> to each other. Our eye <strong>perceives this as white</strong>.</p> <p>On the right (the second transition from orange to blue), shows a gap giving the illusion of a dark color.</p> <h2>A note on mobile devices</h2> <p>Since most webpages on mobile devices are usually <strong>scaled</strong>, this effect is far less noticeable (due to image resampling). Anouther aspect to consider is that the <strong>orientation of the screen</strong> can be changed, and thus possibly creating artifacts in different directions.</p> <p>If you are interested in how this effects are leveraged to render smooth text, you can continue reading the following article on wikipedia: <a href="http://en.wikipedia.org/wiki/Subpixel_rendering" rel="nofollow noreferrer">wikipedia</a> </p> <p>This is how screen work nowadays, nothing you can do about (without changing the design)</p>
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    1. COOk, at least now I can tell my client what the issue is. BTW, I tried changing the rusty orange color to a variety of colors, and as predicted some colors looked fine and some colors not. Thanks to all for your answers.
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