gdal translate -co, which options are available to PNG?

Question

I can create a PNG with:

gdal_translate -of PNG -outsize 10% 10% image.bsq image.png

I see there is a -co (creation options) parameter I can pass to gdal translate. Where can I find which options are available for PNG?

Answer 1

The short PNG driver manual is at http://www.gdal.org/frmt_various.html. Png is an uncommon format for geospatial images. The same lossless compression method is usually applied by creating a deflate compressed TIFF. Then you have options for "predictor" and "zlevel" http://www.gdal.org/frmt_gtiff.html. For setting transparent color I would try to run gdal_translate with the -a_nodata option.