Graphics Programs Reference
In-Depth Information
3.
Go to the
Layers
window and click on the thumbnail of the mask (the one to the
right-hand side) to make it acive (its border should become white). Then go to the
main window (the one containing the image) and go to
Colors
|
Curves...
. In the
Adjust Color Curves
dialog, add two control points and get the curve shown in the
next screenshot:
The purpose of this curve is to get the light gray pixels of the mask to become lighter
and the dark ones to get darker; the strong slope between the two control points
will cause the border of the mask to be sharper.
Make sure that the
Value
channel is selected and click on
OK
.
Now let's take a look at the image and see how strong the contrast of the image is
and how well defined the clouds are now.
4.
Finally, let's go to
Image
→
Mode
→
RGB
to set the internal data format for the
image to a safe format (thus avoiding the risk of having Blender confused by it). Now
we only need to go to
File
→
Save A Copy...
and save it as
EarthClouds.png
in
the
tex
folder of the project. In the dialogs asking for conirmaion, make sure to
tell Gimp to apply the layer mask (click on
Export
in the irst dialog). For the seings
of the PNG file, we can use the default values. Let's close the current image in Gimp
and get the main window empty in order to start working on the next texture.
5.
