To create a specular map:
In Photoshop, open the file for the diffuse map created in Creating a Diffuse Map. Save the file as <filename>_spec. For example, seersucker_spec. The correct name suffix is essential.
On the Main Menu, click Image > Adjustment > Invert. The image is displayed with the inverse colors of the original image.
On the Main Menu, click Image > Adjustment > Saturation.
Make the following adjustments:
Set Saturation to approximately -50.
Set Lightness to approximately -60.
Note
Values may differ depending on material.
Save and test the specular map by assigning it to a garment within VStitcher and adjusting the spread. A luster should be apparent on the 3D simulated fabric with a higher spread value.
Save the file in your preferred file format.