Export sheets with specified dpi

[wkazubski]

Currently gschem exports images to png/jpg/bmp... with several sizes as 640x480 pixels. In such approach the picture scale and quality depends on shet size (or picture size).
This can be avoided if image resolution (100dpi, 150dpi or 300dpi) could be specified instead of total size. This is much the way as eps export works.

[Peter TB Brett (peter-b)]

You can now export raster images at fixed DPI using

gaf export --dpi=${DPI} --output=${OUTPUT_FILENAME} -- ${SCHEMATICS}