https://wiki.blender.jp/index.php?action=history&feed=atom&title=%E5%88%A9%E7%94%A8%E8%80%85%3AAlexK%2FHalfPixel 2026-09-07T17:25:36Z このウィキのこのページに関する変更履歴 MediaWiki 1.31.0 https://wiki.blender.jp/index.php?title=%E5%88%A9%E7%94%A8%E8%80%85:AlexK/HalfPixel&diff=149163&oldid=prev 2018-06-28T21:12:51Z

<p>1版 をインポートしました</p> <table class="diff diff-contentalign-left" data-mw="interface"> <tr class="diff-title" lang="ja"> <td colspan="1" style="background-color: #fff; color: #222; text-align: center;">← 古い版</td> <td colspan="1" style="background-color: #fff; color: #222; text-align: center;">2018年6月28日 (木) 21:12時点における版</td> </tr><tr><td colspan="2" class="diff-notice" lang="ja"><div class="mw-diff-empty">(相違点なし)</div> </td></tr></table>

Yamyam https://wiki.blender.jp/index.php?title=%E5%88%A9%E7%94%A8%E8%80%85:AlexK/HalfPixel&diff=149162&oldid=prev 2015-01-03T18:17:51Z

<p></p> <p><b>新規ページ</b></p><div>=HalfPixel=<br /> I wrote glsl shader for more accurate sampling of zoom out images for Image Editor. As it is glsl, it runs fast and on any gpu.<br /> You can try live demo here:<br /> <br /> http://www.googledrive.com/host/0B4P63MOLDQXJWkVrUlczWUtHODA<br /> <br /> Note, your browser must support WebGL!!!<br /> <br /> <br /> ==Better image sampling==<br /> Mipmaps and point samples ignores some pixels (that might be important). This leads to artifacts.<br /> <br /> My shader integrates over all pixel accurately,<br /> Sidenote: trapezoidal integration cannot be done as it smooths pixels at 1:1 zoom. Therefore, we assume that each image pixel represent a square with the same value. <br /> <br /> Here is some examples:<br /> <br /> [[File:GLSLpattern.png|upright=1]]&lt;br&gt;Concentric circles (Mine, Blender's)&lt;br&gt;<br /> [[File:GLSLgrid.png|upright=1]]&lt;br&gt;Mac OS Chess board (Mine, Blender's)&lt;br&gt;<br /> <br /> The problem is also noticeable for sharp edges at different angles.<br /> <br /> ==SubPixel rendering==<br /> SubPixel rendering gives sharper images as it assume the physical representation of a monitor: [R|G|B] or [B|G|R].<br /> It is very beneficial for text.<br /> <br /> This is blender UI example:<br /> <br /> [[File:GLSLtext.png|upright=1]]&lt;br&gt;Assumes that monitor is [R|G|B], otherwise the result would be worse. (Mine, Blender's)&lt;br&gt;<br /> The subpixel rendering triples the time, but it worth it for the text. Plus, text can be easily optimized by rendering text 3x bigger and sampling it without corner cases.<br /> <br /> ==Limitations==<br /> We must provide the number of max possible iterations as glsl doesn't support not deterministic termination of the loop. This won't be the case for text anti aliasing.</div>

wiki>AlexK