<story><title>The Center of the Pixel is (0.5, 0.5)</title><url>http://www.realtimerendering.com/blog/the-center-of-the-pixel-is-0-50-5/</url></story><parent_chain><item><author>LeoPanthera</author><text>Related: &amp;quot;A pixel is not a little square&amp;quot;.&lt;p&gt;&lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;alvyray.com&amp;#x2F;Memos&amp;#x2F;CG&amp;#x2F;Microsoft&amp;#x2F;6_pixel.pdf&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;alvyray.com&amp;#x2F;Memos&amp;#x2F;CG&amp;#x2F;Microsoft&amp;#x2F;6_pixel.pdf&lt;/a&gt;</text></item></parent_chain><comment><author>pornel</author><text>However, image is not a wave either.&lt;p&gt;I have mixed feelings about this memo. It&amp;#x27;s right about practical aspects of resampling filters, but tries too hard to justify that with sampling theory. For example, pixel-aligned sharp edges exist and are meaningful in images, unlike perfectly square waves in sampling theory.</text></comment>
<story><title>The Center of the Pixel is (0.5, 0.5)</title><url>http://www.realtimerendering.com/blog/the-center-of-the-pixel-is-0-50-5/</url></story><parent_chain><item><author>LeoPanthera</author><text>Related: &amp;quot;A pixel is not a little square&amp;quot;.&lt;p&gt;&lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;alvyray.com&amp;#x2F;Memos&amp;#x2F;CG&amp;#x2F;Microsoft&amp;#x2F;6_pixel.pdf&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;alvyray.com&amp;#x2F;Memos&amp;#x2F;CG&amp;#x2F;Microsoft&amp;#x2F;6_pixel.pdf&lt;/a&gt;</text></item></parent_chain><comment><author>centimeter</author><text>Worth noting that this does not apply to physical cameras - a pixel is not, in fact, a point sample, but the integral over a sub-region of the sensor plane. It&amp;#x27;s also not a complete integral - the red pixels in an image are interpolated from squares that only cover a quarter of the image plane (on 95+% of sensors). Then you bring in low pass filters (or don&amp;#x27;t), and the signal theory starts to get a bit complicated.</text></comment>