Perfect–I wouldn’t have to put him inside the truck back door, which would require cutting the door out of the image and putting it on a new layer, on top of the cat!
Process steps (using GIMP)
- I opened both images (truck and cat) as layers.
- Then I used control-click (right-click) on the cat layer and chose “add alpha channel,” which allows it to be transparent if you erase part of it.
- Time for the eraser tool on the cat layer:
4. After working with the eraser in smaller increments, I ended up with this:
I just wasn’t really thrilled with the result. For one thing, it looked like he was listing to the side a bit.
5. I then went to Layer on the top menu and chose Transform -> arbitrary rotation and rotated him a bit so he wasn’t listing so much. But it still looked weird.
6. He needs a cat bed or a pillow, I thought. Otherwise it just looks like he’s sitting strangely on that truck. I found a picture of a pillow on Pixabay. I did the same as in step 2 to add an alpha channel to the pillow layer, and used the eraser tool to get rid of the white background.
7. But the pillow was sitting at a weird angle; it looked like it wasn’t really sitting flat on the truck. This time I used the perspective tool on the left menu of GIMP and moved the layer around with different perspectives until it looked better.
8. I then cleaned up the edges of the cat a bit more. I realized that if you make the eraser tool bigger, using the brush that looks like the one with a square around it on the right, it will give you softer edges on your erasing around the image (rather than using a smaller brush, which gives harder edges).
And so, the finished product:
Amazing how he can manage to stay on through all the bumps in the road!