GBR2GREYSCALE is a raster image processor designed to convert the Gerber photoplotter format (RS274X) into a greyscale TIFF bitmap for use by image writers and machine vision and inspection equipment (AOI). It is similar to Artwork's GBR_RIP but includes several special features that are not a part of GBR_RIP.
Edge Offset - placing a finite sized pixel on the "edge" of a line can result in wider lines than intended (and narrower gaps.) The Edge offset (-shrink) parameter allows a user to enter an offset distance to account for finite pixel diameter.
Grey Levels - Some imaging systems can support full 255 levels of gray - however many can't take advantage of that many levels. GBR2GREYSCALE has a special bitmap output that has 2 levels of gray between black and white. Of course, if desired, thresholding can be turned off to get the full 16,64 or 255 levels of gray.
Tile size and overlap - the user can define the size of the output tiles and an amount of fixed overlap. Fixed overlap is very helpful for architectures that double expose the stitched regions between photo heads.
Executable or Library
GBR2GREYSCALE is available as either an executable (controlled by a command line inteface) or as a library in DLL format. This gives OEMs who wish to integrate the RIP into their own software maximum flexibility.
Command Line Syntax
The gbr2greyscale RIP executable is controlled by a command line using the following syntax:
gbr2greyscale.exe <input> -outname:<outbasename> -outdir:<outdirectory> -workdir:<workingdirectory> [additional arguments] [Additional Arguments] -bmp Output BMP file format -pack Output TIFF Packbits file -tiff Output uncompressed TIFF file -silent Disable popup messages -keeptmp Keep temporary files -unit:<inch|mm> argument units (default: inch) -shrink:<dblval> Edge Shrink value (default: 0.0) -chord_error:<dblval> Chord error value -circularize:<dblval> after boolean, recover arcs using the value supplied as the tolerance. -thrnum:N number of concurrent threads -super:<2|4|8|16> Super Sampling (default: 0) -ram:<intval> Buffer Size MB (default: 256) -dpi:<dblval> Dots per inch (default: 1024) -dpm:<dblval> Dots per mm -threshold:<intval,intval,intval> Values in percent (grey scale) -bandsize:<w>,<h> Band(tile) width and height in pixels -bandoverlap:<x>,<y> Band(tile) overlap in pixels -window:<LLx,LLy,URx,URy> Window extent -aw:<left,right,bottom,top> auto extents w. user specified margins -inverse Inverse output polarity -no_header Remove output header -rotate:<dblval> Rotate -mirror:<x|y> Mirror output -margin:value Rip margin -scale:value Rip scale -warning Output Gerber Union warnings to log file -scanonly returns data extents into a window -nosplit suppresses both input file validation and G35/G37 shape compensation. -nosplitshrink performs input file validation but suppresses G36/G37 shape compensation. -conditioning_retry:<num> enables multiple passes of polygon "fixing" at the front end for especially "dirty" input data such as those with multiple vertices at the same coordinate. Do not use unless needed. A reasonable starting value for <num> = 2. -gbrargs: < > arguments passed directly to the Gerber Union engine -thrnum:<intval> number of concurrent threads for the sizing engine overrides value on gbr2greyscale thrnum argument. -ripargs: < > arguments passed directly to the RIP engine -thrnum:<intval> number of concurrent threads for the RIP limited to max of 4 -tiffargs: < > arguments passed directly to the tiff formatter -erraswarn When set, dropped polygons will not cause the program to fail. -nowarn This option excludes conditioning warning (warning messages from our split274x call) messages in the log file. Actual conversion errors will still appear in the log file. -norip Does not create any RIP output and reports the image info in the log file.
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