How does one make a transparency map ?

Any art program. Photoshop, Paint Shop Pro, Fireworks, etc...I think even Windows Paint (Bucket?) can do it.

Black parts of the map are opaque and white parts are see-through, grey shades are semi-opaque.

Start with a template as your base layer. Then add a second layer and use your fill tool to make it completely white. Then make it transparent. Then create a third layer and paint in black the parts you want to be transparent using your template as a guide. Then when you are ready to save, make the second white layer opaque again and save. This will hide all of your template underneath. Now when you use your transparandy map, all the black parts will be transparent and all the white parts will show.

Attached Link: http://www.daz3d.com/support/tutorial/index.php?id=985

The link attached goes to a basic guide to making trans maps :-)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire

Attached Link: http://www.poseruniverse.com/Tutorials/V3MFD1.html

Here's another basic tut - it is a large (1MB) html page.

It depends on what part of what you want to look transparent? = )