设置图象显示选项

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--骑着猪闯红灯 2005年11月28

Setting image display options

Before background images can be displayed, you must provide SkyMap with the information needed to display them; this is done using the Background Images Configuration Dialog. To display the Background Images Configuration dialog, select the File/Preferences/Background Images menu item. The dialog has two pages, one for "general" options, and the other relating specifically to the use of the "RealSky" CD-ROMs. When doing the initial setup, select each page in turn and make sure that all settings are correct.


General Page

设置图像显示选项 在使用背景图像之前,你必须通过背景图像配置对话框进行相应的设置。 选择文件/参数设置/背景图像弹出配置对话框。对话框一共有两页,一页是“常规”设置,一项是专门用于配置"RealSky"光盘的。当你第一次安装SKYMAP的时候,一定要确定这两项你都设置正确了。

常规

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This page of the dialog allows you to select general options for the display of background images.

这一页用于背景图像的常规配置。

The Source of data section specifies the place from which background images will be read. This can be either the RealSky or DSS CD-ROMs, or the Internet. If you select the Internet as the source of background images, the URL from which images are downloaded is specified on the Downloaded Data Options Dialog, accessed from the File/Preferences/Downloaded Data menu item.

数据源用于选择背景图像的路径。可以是RealSky和DSS的光盘,也可以来源于Internet。如果你选择了从互联网下载,,你必须选择文件/参数设置/下载数据 菜单,通过下载数据选项对话框对下载地址进行配置。

The Cache settings section controls whether or not background images are cached, and if so, the directory in which cached images are stored. If caching is enabled, a new background image, either read from CD-ROM or downloaded from the Internet, will be copied to the cache directory. When a background image of that same object is next requested, it will be retrieved from the cache directory, rather than being read once again from the original source.

缓存设置允许你选择是否使用背景图像缓存,以及选择背景图像缓存目录。如果允许使用缓存,当一幅新的图像被读取的时候,它会被自动地复制到缓存目录。这样当你下一次再次调用相同地背景图像地时候,程序就会从缓存文件读取这个图像,这比再次从光盘或者网络读取要好得多。

The Map settings section of the dialog controls the view level at (and beyond) which the "Background Image" option will be displayed on the right-click menu for an object. This should be set to a reasonably high value (the default is view level 7), because background images generally only cover a very small portion of the sky; they are intended to provide an image of a specific object, not a photographic background for an entire map.

星图设置用于选择在高于哪一个查看等级的时候,"背景图像" 选项会才出现在鼠标右键菜单中。你应该设置一个较高的值(默认值是7),因为背景图像仅仅会覆盖星图的一小部分,这个功能本身就是用来谓一个特定的星体提供图像的,而不是为了给整个星图来提供背景图像。

RealSky Page

RealSky Page选项

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If you've selected either RealSky or DSS as the source of background images, this page of the dialog allows you to set up the information that SkyMap needs to know in order to access the CD-ROMs. RealSky is supplied in two halves - one covering the northern sky, the other the southern sky. Select which of these sets of CD-ROMs are available to you.

如果你选择了RealSky或DSS光盘作为背景图像的来源,你需要通过此页的配置来确定光盘路径。RealSky光盘分为两部分-一部分提供北天的图像,另外一部分提供南天的图像。所以,你必须在此对话页选择你要使用那一部分的RealSky。

If you own both parts of RealSky, the region of the sky between roughly declination 3°N and 15°S is covered by both sets of CD-ROMs. Select which half of RealSky should be used to display images in this region.

如果RealSky的两部分你都有,你需要注意的是赤纬3°N 和15°S之间区域是两张光盘都可以显示的。所以你需要选择使用那一张光盘来显示该区域。

If you only have one CD-ROM drive available, and you've not done a complete installation of SkyMap to hard disk, it will be necessary to swap between the RealSky and the SkyMap CD-ROM when displaying images. If you have two CD-ROM drives, you'll be able to display RealSky images without needing to take out the SkyMap CD-ROM. The RealSky CD-ROM location section of the dialog allows you to specify which of these two options to use. If you do have a second CD-ROM drive available, specify the root directory of the drive; this can either be a drive letter (for a local CD-ROM drive), or a network UNC name for a drive accessed remotely across a network.

如果你仅有一个光驱,并且你没有完全安装skymap当你要查看图像的时候,你可能需要取出skymap光盘然后再放入RealSky光盘。但是当你拥有两个光驱,你就无需这么作了。RealSky 光盘位置 选项允许你指定你实际是那种情况。如果你的确拥有第二个光驱,你就需要指定它的根目录;它可以使一个盘符(本地磁盘)也可以是一个网络驱动器的位置。

The Image settings portion of the dialog specifies the size of the image extracted from the CD-ROM. For most purposes, the default settings of 20'x20' should be acceptable. If, for some reason, you do have a need to extract large images, the process can be greatly speeded up by increasing the Image subsample size value from its default value of "1". Increasing this value to "n" will result in only "1 in n" pixels being read from the RealSky image; this will significantly speed up the image extraction process, but will result in a "blocky" images. Experiment with this setting to discover its value and its shortcomings.

图像设置选项用于指定你要从光盘获得的图像的大小。通常,默认的20'x20'是十分合适的。如果在某些情况下,你确实需要一幅很大的图像 ,你可以尝试改变小图像大小的值来快速完成此项工作。你可以把这个值从默认的“1”调整到“n",这会导致只有n个像素中的1个像素会被读取。虽然这样可以快速放大图像,但是会导致图像“斑驳模糊”。你可以尝试一下这个选项,以确定它的使用价值和缺陷所在。

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