There are some ways to adjust the parameters of gamma in 3ds Max (shown below). It will manage and save the brightness of the rendering results in some files which support this effect.
In this case, if you save the image with the unsupported file format, you may not get the brightness results that you want.
In such situation, the best solutions are:
- To use the Gamma Correction in our Add New Render Job form
- To collate your image file format with the table below