Now that we accomplished the other two other parts [LINK] we shall move to the hardest part of this tutorial: Making the hole (well, this one is quite simple), then a bit forward in the tutorial we will make a some kind of tube orifice, where tubes tend to connect, usually very seen on space type textures or characters with alot of machinery, and I thought people would like to know better how to achieve this kind of effect.
Let's begin with making a circle selection (again, don't forget to hold shift while you are making the selection, to make a perfect circumference), and, as usual, Feather the selection with 0.5 (depends on the dimension of the document)
Now with the burn tool, (large brush, the opacity is at your choice) paint it inside the selection starting from the top, be reminded that since it is a supression.
The shadow follows the lightsource, so this means that it is painted in the direction of the lightsource, like in the image below:
Accentuate the shadows now, but very slightly, in order to give depth.
This step will have a great importance, it's gonoing to be the step that will make it look like a hole, which means, that with the dodge tool we will make with a very small brush (maybe 5 or 4 pixels) with some itensity (around 30) and paint it in the opposite side of the lightsource, like in the image.
Add a bit more itensity in the highlight using a brush with maybe the half dimension of the previous (2 pixels) DON'T FORGET THAT WE ARE STILL USING BURN AND DODGE TOOL
Now to finalize add some highlight with midtone (2 pixels as well) but with very low opacity on the area that hasnt got shadow in the hole, near the zone with more shadow, and follow its shape, and there you go! A hole in metal that is somekind of realistic, there are various ways onto achive this kind of effect, and it is very easy to do so!
This little part will give you a lot of trouble, I don't know the name for it so it will have to stay "round...thingie", be remembered that my first language isnt English, but Portuguese, so go easy on me... anyways we shall start from the cilindrical surface where the "plug" is inside the supression. For this step it is crucial that we make the right selection, for this step I wont explain it by images, but with test:
- Make a sphere selection in a new layer and fill it with a color.
- Select the selection again (DO NOT FEATHER ANYTHING YET) and contract it , maybe 10 or 15 pixels will do, it really depends, and delete that selection from the color you've previously filled.
- Hide this layer and select it's selection by clicking CTRL+click on the layer , here's an image below: