If some referenced graphics are already in a format appropriate for Web use, such as JPEG, GIF, or PNG (see §40.1.4 Graphics formats for HTML) you do not have to convert them.
Copy the graphics files into the project directory with the generated .htm files, or allow DITA2Go to copy them for you to the wrap directory; see §32.1 Locating graphics files for HTML. Unless you explicitly remap a name in the [GraphFiles] section, or specify a GraphSuffix in the [Graphics] section, the graphic name is always passed through unchanged.
If the original graphics are not in the same directory as the DITA files that reference them, but they will be in the same directory as the generated HTML files, set the following option also (see §32.1 Locating graphics files for HTML):
[Graphics] StripGraphPath=Yes
If you have supplied replacements for referenced graphics that are in a different format, and if the replacements have the same base names as the originals, you can specify just the new file extension (see §40.2.1.2 Substituting graphics files for HTML):
[Graphics] GraphSuffix=jpg
Use this setting when you convert referenced graphics with a third-party program; see §4.4 Processing graphics.
If you have replaced some referenced graphics with others, and your graphics are in several formats, such as mostly GIF plus some JPEG and some PNG, you can do the following:
[Graphics] GraphSuffix=gif
[GraphSuffix] ; old suffix = new suffix, overrides [Graphics]GraphSuffix ; jpg=jpg leaves all .jpgs alone even if GraphSuffix=gif ; wmf=png .wmfs are made into .pngs using a third-party tool jpg=jpg png=png
[GraphFiles] newlogo.jpg=newlogo.gif