Watermark in GIMP
Dr Colossus
I want to put a water mark on some of my pics for my webpage.
But I don't know how, I've got the water mark I want to use, it's in
greyscale. I want to make it so the bright parts of the water mark
lighten the image, and the dark parts darken it.
It should end up with a semi-transparent, embossed effect. I'm
sure you've seen it done before. Does anyone know how it's done?
Jim Lokken
manual.gimp.org) has a little part on that. I don't have a copy of it
with me, but let me try to remember.
1) Make the original image the background
2) Create a new layer for your watermark.
3) Blur the watermark a bit. (this layer should be not visible in the
final product - click the eye to remove it)
4) Create a new layer.
5) Use Bump Map on that layer with your blurred watermark layer as the
source.
6) Duplicate the resulting layer.
7) On the original bumpmap, use color/threshold dialog and adjust the
left (black) triangle to the right until it's close to the peek in the
histogram. This should leave the highlights of the BumpMap remaining.
8) In layers dialog, change the mode to "screen".
9) In the duplicated bumpmap layer, use color/threshold again and adjust
the right (white) triangle to the left until it's close to the peek in
the histogram. That should leave only the shadows of the BumpMap
remaining.
10) In the layers dialog, change the mode to "multiply" (I think).
I could be a little backwards in the last 4 steps, but you'll know if
they work or not, and if they don't, use the other mode.
Jim