tag:blogger.com,1999:blog-5157785897936147656.post7731529734557772457..comments2022-12-14T10:04:20.773+00:00Comments on Archaeological Geophysics with Snuffler: Snuffler: Destripe FilteringDavid Staveleyhttp://www.blogger.com/profile/11829147049242240411noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-5157785897936147656.post-78257437481113063382013-09-27T06:38:34.013+01:002013-09-27T06:38:34.013+01:00This comment has been removed by a blog administrator.enochdavishttps://www.blogger.com/profile/13730257290671676641noreply@blogger.comtag:blogger.com,1999:blog-5157785897936147656.post-80330791113431735302012-06-12T16:21:14.477+01:002012-06-12T16:21:14.477+01:00"The human eye will have trouble picking out ..."The human eye will have trouble picking out more than 32 shades of grey."<br /><br />I would guess that this probably varies over the population, but the following link suggests something between 32 and 64: http://www.cs.unm.edu/~brayer/vision/perception.html (personally I can distinguish even more, but that may develop from a lot of computer graphics work -- and a high quality LCD can make a lot of difference)<br /><br />From a theoretical and program design viewpoint, however, by limiting it to 32 shades you are giving a limited display of the data. The eye will never see differences between particular readings even if they exist, because they're being displayed with the same grey. If you output 256 shades then the only limitation on the display is the range of the readings.<br /><br />Whether or not people can distinguish the different greys is then left up to their personal visual perception.<br /><br />Does that make sense? Have you tried it with 256 shades? I'd be really interested in seeing the difference between a 32 and 256 shade plot of the same data.pdurdinhttps://www.blogger.com/profile/17009164000358908795noreply@blogger.comtag:blogger.com,1999:blog-5157785897936147656.post-81504448350100415032012-06-11T17:06:38.371+01:002012-06-11T17:06:38.371+01:00The human eye will have trouble picking out more t...The human eye will have trouble picking out more than 32 shades of grey. If you are having contrast problems with picking out weak features, then either manually playing with the upper and lower bounds of the display parameters, or filters such as Remove Geology for resistivity data, will probably help.David Staveleyhttps://www.blogger.com/profile/11829147049242240411noreply@blogger.comtag:blogger.com,1999:blog-5157785897936147656.post-81011359084413325372012-06-11T09:30:24.916+01:002012-06-11T09:30:24.916+01:00Not related to this post, but what's the reaso...Not related to this post, but what's the reason you limit the greyscale plot to 16 or 32 shades rather than using the full available range of 256?<br /><br />I found when playing with display algorithms myself that for resistance data in particular a wider range helped, so I'm just curious.pdurdinhttps://www.blogger.com/profile/17009164000358908795noreply@blogger.com