Merge pull request #1799 from guilhermefelipecgs/add_invert_color

Add description to invert color

getting_started/workflow/assets/importing_images.rst

@@ -100,7 +100,7 @@ Filter
 When pixels become larger than the screen pixels, this options enable linear interpolation for them. The result is a smoother (less blocky) texture. This setting can be commonly used in 2D and 3D, but it's usually disabled when making pixel perfect games.
 
 Mipmaps
--------
+~~~~~~~
 
 When pixels become smaller than the screen, mipmaps kick in. This helps reduce the grainy effect when shrinking the textures. Keep in mind that, in older hardware
 (GLES2, mainly mobile), there are some requirements to use mipmaps:
@@ -149,6 +149,10 @@ HDR as SRGB
 
 Some few HDR files are broken and contain SRGB color data. It is advised to not use them but, in the worst case, toggling this option on will make them look right.
 
+Invert Color
+~~~~~~~~~~~~
+
+Reverses the image's color. This is useful for example to convert a height map generated by external programs to depth map to use with :ref:`doc_spatial_material`.
 
 Detect 3D
 ---------