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<h1 id="firstHeading" class="firstHeading mw-first-heading">
<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Distinctness of image</span></span>
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<p><b>Distinctness of image</b> (<b>DOI</b>) is a quantification of the deviation of the direction of light propagation from the regular direction by <a href="Scattering" title="Scattering">scattering</a> during transmission or reflection. DOI is sensitive to even subtle scattering effects; the more light is being scattered out of the regular direction the more the initially sharp (well defined) image is blurred (that is, small details are lost). In polluted air it is the sum of all particles of various dimensions (dust, aerosols, vapor, etc.) that induces <a href="Haze" title="Haze">haze</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>DOI is measured to characterize the <a href="Visual_appearance" title="Visual appearance">visual appearance</a> of polished high-<a href="Gloss_(material_appearance)" class="mw-redirect" title="Gloss (material appearance)">gloss</a> surfaces such as automotive car finishes, <a href="Mirror" title="Mirror">mirrors</a>, beyond the capabilities of gloss.
</p><p>Other <a href="Visual_appearance" title="Visual appearance">appearance</a> phenomena are: <a href="Gloss_(material_appearance)" class="mw-redirect" title="Gloss (material appearance)">gloss</a>, <a href="Visual_appearance" title="Visual appearance">haze</a>, and <a href="Orange_peel_(effect)" title="Orange peel (effect)">orange peel</a>. Various categories of visual appearance related to the perception of regular or diffuse reflection and transmission of light have been organized under the concept of <a href="Cesia_(visual_appearance)" title="Cesia (visual appearance)">cesia</a> in an order system with three variables. In this system, DOI is connected to the variable called <i>diffusivity</i>.
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<div class="mw-heading mw-heading2"><h2 id="Reflected_Image_Quality_(RIQ)_vs._DOI">Reflected Image Quality (RIQ) vs. DOI</h2></div>
<p>DOI is not sensitive to low amounts of orange peel on highest quality surfaces.
</p><p>RIQ has more proportionate response to orange peel on a wider range of surface finishes.
</p><p>RIQ works well in differentiating low gloss surfaces with different specular/diffuse components.
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<div class="mw-heading mw-heading2"><h2 id="Parameters_that_affect_RIQ">Parameters that affect RIQ</h2></div>
<ul><li>Substrate alignment (horizontal/vertical)</li>
<li>Coating formulation</li>
<li>Substrate</li>
<li>Application technique</li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">Fan, Charles H. "Validation of Orange Peel Measurement of Paint Appearance on Composite Substrates" General Motors Corporation</span>
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<ul><li><i>ASTM Standards on Color & Appearance Measurement</i></li>
<li>Richard S. Hunter, <i>The Measurement of Appearance</i>, John Wiley & Sons (1987)</li></ul>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20150624162825/http://www.rhopointinstruments.com/images/pdfs/Rhopoint%20IQ%20Measurement%20Theory.pdf">Measurement Theory</a></li></ul></div><!--htdig_noindex--><div><div class="zim-footer">
This article is issued from <a class="external text" title="Last edited on 2023-12-26" href="https://en.wikipedia.org/wiki/?title=Distinctness_of_image&oldid=1191957308">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.
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