I use Imagemagick convert to convert pdf file to png as follows:

Magick convert -density 300 PointOnLine.pdf -quality 90 PointOnLine.png

It gives warning:

convert: profile 'icc': 'RGB ': RGB color space not permitted on grayscale PNG `PointOnLine.png' @ warning/png.c/MagickPNGWarningHandler/1744.

And png image created is all black. However, convert to jpg image is fine. What is the problem? Thanks.


Try adding -colorspace RGB before the outfile name.

convert -density 300 PointOnLine.pdf -quality 90 -colorspace RGB PointOnLine.png
| improve this answer | |
  • It works for me! Many thanks! – Black Mild Feb 27 at 1:47
  • Nice. For me the white background became transparent, but this can still be used. – user74094 Mar 25 at 14:46

The documentation says this:

PNG RW Portable Network Graphics Requires libpng-1.0.11 or later, libpng-1.2.5 or later recommended. The PNG specification does not support pixels-per-inch units, only pixels-per-centimeter. To avoid reading a particular associated image profile, use -define profile:skip=name (e.g. profile:skip=ICC).

So try adding -define profile:skip=ICC (or skip="*") before the outfile name.

See also: documentation on the define command

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  • No, after setting -define profile:skip=ICC, image is still dark. But if convert to jpg and then to png, it is ok, but background is dark. The same warning happens. – hermes Feb 7 '18 at 18:19

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