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The latest version of Imager now supports several different methods of customising an Operating System disk image (OS image). To prevent things going awry when the wrong style of customisation is applied, Imager refuses to offer customisation options when it doesn't know what cusomisation method an image requires (the previous version of Imager would happily apply the "wrong" customisation method). When Imager starts up, it downloads a manifest file which tells it about all the online images available, as well as metadata about those images, including what customisation methods those images require. So when flashing an online image onto an SD card, Imager knows what OS customisation options to display.
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However when selecting a locally downloaded image file in Imager (the Use custom option), this metadata isn't available, and so Imager won't offer any customisation options. The workaround for this is to create a JSON file for your local image file, containing the full path to your image file and any necessary metadata, and point Imager at this local JSON file. This process can be a bit cumbersome, so the create_local_json.py script has been created to make this a bit easier (for those OS images in Imager's current manifest file).
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最新版本的Imager现在支持多种不同的操作系统磁盘映像（OS映像）自定义方法。为了避免在应用错误的自定义风格时出现问题，当Imager不知道某个映像需要哪种自定义方法时，它会拒绝提供自定义选项（而Imager的上一版本则会欣然采用“错误的”自定义方法）。Imager启动时，会下载一个清单文件，该文件会告知它所有可用的在线映像，以及这些映像的元数据，包括它们所需的自定义方法。因此，当将在线映像烧录到SD卡上时，Imager会知道要显示哪些操作系统自定义选项。
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然而，在Imager中选择本地下载的镜像文件（使用自定义选项）时，此元数据不可用，因此Imager不会提供任何自定义选项。解决此问题的方法是为本地镜像文件创建一个JSON文件，其中包含镜像文件的完整路径和任何必要的元数据，并将Imager指向此本地JSON文件。此过程可能有些繁琐，因此创建了create_local_json.py脚本，以使此过程变得更容易（针对Imager当前清单文件中的操作系统镜像）。