图像模块
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简介
目前，该模块已支持打开BMP，JPG，PNG与XPM文件格式。
工具
Open: 在新的视口中打开图像。
Import to plane: 将图像导入至3D视图中的平面内。
Scaling: 对导入至平面内的图像进行缩放处理。
特性
- 与草图相似，我们可将导入的图像附于XY，XZ或YZ主平面之一，并为之调整正、负偏移值。
- 导入图像的比例关系为1像素:1毫米。
- 建议导入具有合理分辨率的图像。
若要进行描边处理，最好是令图像距工作平面有个较小的负偏移量，例如-0.1 mm。这就意味着图像将稍稍偏于绘制2D几何图形平面的后侧，继而就不会把2D底图/草图绘制在图像上了。
可在导入图像时设置其偏移量，或者在后面的处理流程中通过修改其属性来实现这一点。
User documentation 
- Installation: Windows, Linux, Mac; Getting started
- Basics: About FreeCAD, Workbenches, Preferences, Document structure, Interface Customization, Properties, Mouse Model; Tutorials
- Workbenches: Arch, Draft, FEM, Image, Inspection, Mesh, OpenSCAD, Part, PartDesign, Path, Plot, Points, Raytracing, Reverse Engineering, Robot, Ship, Sketcher, Spreadsheet, Start, Surface workbench, TechDraw, Test Framework, Web
- Scripting: Introduction to Python, FreeCAD scripting tutorial, FreeCAD Scripting Basics, How to install macros, Gui Command, Units Modules: Builtin modules, Workbench creation, Installing more workbenches Meshes: Mesh Scripting, Mesh Module Parts: The Part Module, Topological data scripting, PythonOCC, Mesh to Part Coin scenegraph: The Coin/Inventor scenegraph, Pivy Qt interface: PySide, Using the FreeCAD GUI, Dialog creation Parametric objects: Scripted objects Other: Code snippets, Line drawing function, Embedding FreeCAD, FreeCAD vector math library, Power users hub, Python, Macros, FreeCAD Scripting Basics, Topological data scripting
