composite: unable to open image `nmn.png': No such file or directory @ error/blob.c/OpenBlob/2709.
composite: unable to open file `nmn.png' @ error/png.c/ReadPNGImage/3922.
composite: missing an image filename `gnomonic_grid.png' @ error/composite.c/CompositeImageCommand/1613.
rm: cannot remove ‘nmn.png’: No such file or directory
convert: unable to open image `gnomonic_corr_grid.png': No such file or directory @ error/blob.c/OpenBlob/2709.
convert: unable to open file `gnomonic_corr_grid.png' @ error/png.c/ReadPNGImage/3922.
convert: no images defined `tmp.png' @ error/convert.c/ConvertImageCommand/3210.
rm: cannot remove ‘tmp.png’: No such file or directory
rm: cannot remove ‘gnomonic_corr_grid.png’: No such file or directory