光栅图像格式将图片存储为描述像素状态的位图，而不是记录图元（譬如，线和曲线）的长度和位置。
Raster image formats store the picture as a bitmap describing the state of pixels, as opposed to recording the length and locations of primitives such as lines and curves.
带标记的图像文件格式 (.tiff) 是另一种常用的基于栅格的图像格式，GIS 专家为适应地理学者的需要将其重命名为 GeoTIFF。
Tagged image file format (.tiff) is another commonly used raster-based image format, which GIS specialists adapted to geographers' needs and renamed GeoTIFF.
如果你想设置图层为默认，请选中。同时，请在保存栅格图像时选择一种图像格式。
Choose, if layers should be enabled by default. Select an image format to use when saving raster images.
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