Monday, August 27, 2012

Layer Table and Defining Layers


Use the Tables pull down menu or the “y” hotkey to access the Layer Table.


The layer table is used to set the layer Type, and assign Draw and Flash colors. 
It can also be used to set the Active layer (the layer that remains on when all others are turned off) and the Top layer (the layer that redraws last and therefore appears “on top” in the screen display). 


The Data column indicates whether or not the layer contains any data.


(Note that the layer numbers correspond to the numbers in the layer bar.)



Layer types are selected from a pull down menu that is accessed from a cell in Type
column of the layer’s row.
Select the appropriate layer definition from the available options.

Note: 
Whether a plane is positive or negative has nothing to do with its electrical characteristics
but with whether the photo file represents a positive or negative image. “Positive Plane”
layers are processed the same as “Internal” layers

Colors are selected from a chart that pops up by clicking the Draw or Flash cells. 
Color selection is purely a matter of user choice. Try to select familiar draw colors that will help you recognize layers on sight. Choose a different (preferably dark) color for flashes.
In addition to the ability to turn layers On and Off the Layer Table can set a layer to “Ref
(for reference). In this condition objects on a layer can be viewed but can not be selected.



A video demonstrating Layer Table and Defining Layers will be posted on the next blog post.


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