Harmony and Color Management

Every images are treated as linear.  Some output formats convert the exported image's color space when compressing the image. By example, exported ProRes file with QuickTime are gamma corrected when the "Gamma Correction" option is checked. This is an exception and doesn't apply in most cases.

EXR

Harmony always export 16 bits per channel half-float images. 
The colour space of the images is always linear as specified by the EXR standard. 

In some softwares, the Harmony EXR will show up as being 32 bits float. It's because most softwares do not process 16 bits half float images. They convert to 32 bits float. Then, the media is displayed as being 32 bits in memory even if it is 16 bits on the disk.

In some softwares, the Harmony EXR files will look washed out. The reason is that those software convert the linear image found into the EXR file into a given gamma corrected color space (ex: sRGB, rec709, etc.). Those softwares usually provide a setting in their viewer to specify the desired colour space. Select Linear to be able to see the images as they are in Harmony. It might also be possible to tag the imported EXR files color space. In the case real life footage is used with the image generated by Harmony, set the color space of the EXR file to match the one from the other software's viewer.