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Ενας απροσμενος επισκεπτης στο Test Room! (Sony VW-200)
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<blockquote data-quote="Browser" data-source="post: 318682" data-attributes="member: 96"><p>Και περι ansi contrast.....</p><p></p><p><strong>Methods of measurement</strong></p><p></p><p> Many manufacturers of display devices favor the use of the <em>full on/full off</em> method of measurement, as it cancels out the effect of the room and results in an ideal ratio. Equal proportions of light reflect from the display to the room and back in both "black" and "white" measurements, as long as the room stays the same. This will inflate the light levels of both measurements proportionally, leaving the black/white luminance ratio unaffected.</p><p> Some manufacturers have gone as far as using different device parameters for the two tests, even further inflating the calculated contrast ratio. With <a href="http://en.wikipedia.org/wiki/DLP" target="_blank">DLP</a> projectors, one method to do this is to enable the <a href="http://en.wikipedia.org/wiki/DLP#Single-chip_projectors" target="_blank">clear sector</a> of the color filter wheel for the <em>"on"</em> part and disable it for the <em>"off"</em> part<a href="http://en.wikipedia.org/wiki/Contrast_ratio#_note-practical" target="_blank">[1]</a> This practice is rather dubious, as it will be impossible to reproduce such contrast ratios with any useful image content.</p><p> <span style="color: Red">Another measure is the <em>ANSI contrast</em>, in which the measurement is done with a checker board patterned test image where the luminosity values are measured simultaneously. <strong>This is a more realistic measure of system capability, but includes the potential of including the effects of the room into the measurement, if the test is not performed in a room that is close to ideal.</strong></span></p><p> <em><strong><span style="color: Purple">It is useful to note that the full on/full off method effectively measures the dynamic contrast ratio of a display, while the ANSI contrast measures the static contrast ratio.</span></strong></em></p><p></p><p></p><p></p><p><span style="color: Black"><span style="font-size: 10px"><strong><em>Αρα, προφανως αν μιλαμε για "δυναμικη περιοχη" αναφερομαστε στο <em><strong><span style="color: Purple"> full on/full off contrast.</span></strong></em></em></strong></span><strong><em></em></strong></span></p><p><span style="color: Black"><strong><em></em></strong></span></p><p><span style="color: Black"><strong><em></em></strong></span></p><p><span style="color: Black"><strong><em></em></strong></span><span style="color: Blue">http://en.wikipedia.org/wiki/Contrast_ratio</span></p></blockquote><p></p>
[QUOTE="Browser, post: 318682, member: 96"] Και περι ansi contrast..... [B]Methods of measurement[/B] Many manufacturers of display devices favor the use of the [I]full on/full off[/I] method of measurement, as it cancels out the effect of the room and results in an ideal ratio. Equal proportions of light reflect from the display to the room and back in both "black" and "white" measurements, as long as the room stays the same. This will inflate the light levels of both measurements proportionally, leaving the black/white luminance ratio unaffected. Some manufacturers have gone as far as using different device parameters for the two tests, even further inflating the calculated contrast ratio. With [URL="http://en.wikipedia.org/wiki/DLP"]DLP[/URL] projectors, one method to do this is to enable the [URL="http://en.wikipedia.org/wiki/DLP#Single-chip_projectors"]clear sector[/URL] of the color filter wheel for the [I]"on"[/I] part and disable it for the [I]"off"[/I] part[URL="http://en.wikipedia.org/wiki/Contrast_ratio#_note-practical"][1][/URL] This practice is rather dubious, as it will be impossible to reproduce such contrast ratios with any useful image content. [COLOR=Red]Another measure is the [I]ANSI contrast[/I], in which the measurement is done with a checker board patterned test image where the luminosity values are measured simultaneously. [B]This is a more realistic measure of system capability, but includes the potential of including the effects of the room into the measurement, if the test is not performed in a room that is close to ideal.[/B][/COLOR] [I][B][COLOR=Purple]It is useful to note that the full on/full off method effectively measures the dynamic contrast ratio of a display, while the ANSI contrast measures the static contrast ratio.[/COLOR][/B][/I] [COLOR="Black"][SIZE="2"][B][I]Αρα, προφανως αν μιλαμε για "δυναμικη περιοχη" αναφερομαστε στο [I][B][COLOR=Purple] full on/full off contrast.[/COLOR][/B][/I][B][COLOR=Purple][/color][/B][COLOR=Purple][/color][/I][/B][/SIZE][B][I][COLOR=Purple][/COLOR] [/i][/b][/COLOR][B][I][/i][/B][I][/I][COLOR=Blue]http://en.wikipedia.org/wiki/Contrast_ratio[/COLOR] [/QUOTE]
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