CGM graphics files are commonly supported in graphics editors and these can usually save them to other formats including TIFF. You can also find special programs like SDI Convert, that are specially designed for working, editing or conversion of .cga images. You may also want to check CGM to TIF conversion for more options.
Convert Computer graphics metafile to Aldus Tagged Image File Format (TIFF) bitmap image.
We have found 2 software records in our database eligible for .cgm to .tiff file format conversion.
Microsoft Windows software - convert cgm to tiff on Windows
A set of applications used by professional graphic designers
Convert from cgm file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned cgm to tiff. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A CAD CGM converter