This
tutorial shows how to smooth rough edges in GIMP. Please note,
this only works on pictures cut from the background (in this case,
Sims). Here is the photo that I am going to start with (please ignore
the crappy cut-out of the sim).
Select your sim. One way I found is that if the background is a solid color, select it with the select by color option (Select> By Color) then click the background and then inverse the selection (Select>Invert).
For this tutorial, we are going to use a layer mask to smooth the edges. Shift-click your cut-out layer so that the sim is selected. Now, right click the layer of your cut out sim and select "Add Layer Mask". When the window pops up, select the "Selection" option and check the box that says "Invert mask". Your layer mask will be added to that layer and it should look like silhouette of your sim on a black background.
For this tutorial, we are going to use a layer mask to smooth the edges. Shift-click your cut-out layer so that the sim is selected. Now, right click the layer of your cut out sim and select "Add Layer Mask". When the window pops up, select the "Selection" option and check the box that says "Invert mask". Your layer mask will be added to that layer and it should look like silhouette of your sim on a black background.
Once the layer mask is created, you can deselect your sim (Select>None)
With the layer mask selected, go to Filter>Blur>Gaussian Blur and set the radius to around 10. Click okay.Your numbers will probably vary depending on the size of the photo.
Now
your sim in the layer mask should be slightly blurry. With that layer
mask still selected, go to Colors>Level. Play
around with the levels by moving the outer arrows towards the middle
arrow until the edges on your sim look smoother. You can also move the
middle arrow around to get the desired effect. My settings are shown
below. The values for the arrows read 42, 0.22 and 235. Your photo will
change while you adjust the levels so you can see the result before
clicking Ok.
As you see
from the photo below, the edge on my sim's shoulder is a lot smoother
than it was before.
This
is just one method you can use to smooth rough edges. You could also
use an eraser and carefully go over the edges. This technique is tedious
and time-consuming and it helps to have a steady hand. Another method
that could be used is to use the smudge tool and carefully run it over
the edges (this works best for images not cut from the background).
So that is it. If you need more explaination or have any questions, feel free to ask.









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