Example of Extracting a Pixel Window

Sometimes you may only need a small window of your input TIFF data to be converted to MEBES or GDSII. If this is the case you can use the -pw option on the command line.

Consider the following TIFF monochrome bitmap shown below: (this file started as a color jpg which was converted to gray scale and then to a monochrome bitmap using a halftone screen in Photoshop.)

tiff monochrome bitmap of a penny

We can convert this to GDSII with the following command line:


c:\wcad\tiff2mebes\tiff2mebes.exe     program

 -gds                                 output gdsii
 
   -pixel:1                           each pixel = 1 um
   
     penny_halftone.tif               input file
	 
         penny_halftone.gds           output file
		 

Here is what the GDSII file looks like:

tiff monochrome bitmap of a penny


But let's say we just need Lincoln's head and not the entire bitmap. Assuming we know the pixel coordinates that define his head then we can specify these on the command line and get a much smaller GDSII file using the -pw command line option.



pixel window coordinates

The command line to cut out this window is:


c:\wcad\tiff2mebes\tiff2mebes.exe     program

 -gds                                 output gdsii
 
   -pixel:1                           each pixel = 1 um
   
     -pw:550,800,1300,1700            use this pixel window (LL, UR)
   
       penny_halftone.tif             input file
	 
           penny_halftoned_pw.gds         output file
		 

and below you can see the GDSII file which was produced by taking the pw clipping coordinates and converting only the data inside the clipping window.


gdsii using pw option






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