[patch] add compression option to vtkPNGWriter
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
This patch adds a knob to the vtkPNGWriter class to allow the selection of a compression level (0-9). This maps directly to the png_set_compression_level function in the libpng API.
The default is 0 (no compression). I am open to suggestions on what you define a good default value.