How to indent wrinkles in a shirt ?

[vmars316]

GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User

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Hello & Thanks ,
I would like to know how to indent wrinkles in an image .
What I am hoping for now is to make the darker areas indented .
More like wrinkles or creases in an un-ironed shirt .
Not sure if I am using the correct terminology here .
I suppose another way to look at it is to make all the white areas bumps .
See two samples below .
Sorry , didn't mean to add two WrinkledShirt-01.png .

WrinkledShirt-01.png (162.01 KiB) Viewed 3488 times

WrinkledShirt-01.png (162.01 KiB) Viewed 3488 times

Thanks

[racer-x]

Use Filters > Map > BumpMap. Then link to the bumpmap you have.

Actually, Wallace made a nice tutorial on this: http://gimpchat.com/viewtopic.php?f=24&t=9424