How to change heads


How can I change objects e.g.  the heads of two people?
I've tried a few options but it didn't work.

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David BruggeCommented:
Your question makes me smile! I assume that you mean that you want to switch the heads of two people in a photograph.

Start my making copies of the heads one at a time onto new layers. To keep this simple, use the rectangular marquee tool and select an area that includes all of the head and press Ctrl+J. Then go back to the original layer and select the other head and repeat.

You should now have the original image on the background layer, plus two layers, one for each head.

Now hide the background layer and zoom in on one of the heads. Make the layer with this head active and at the bottom of the layers pallet, click the mask icon. Your colors pallet should now be black and white. If it is not, press Ctrl+D to set them to black and white. Select the brush tool and choose a small brush and make the hardness 85%. Paint black over the parts of the photo outside of the head that you want to disappear.

Because you are working on a mask, the areas that you paint black will be hidden. If you make a mistake, change your brush color to white and where you now paint will reappear. Work with this until you have the head totally isolated. Do the same for the second head.

If, when you paint with your black or white brush and the image actually turns black or white, then you are not painting on the mask. Undo your brush strokes and click on the mask icon on the correct layer and start again.

After you have the heads isolated, you will need to hide them and return to your original image. Make a new empty  layer over the background layer. Select the stamp tool, and in the tool bar at the top of the screen, be sure "Aligned" is checked and select "Current & below" from the pull down menu.

Now, on this new empty layer work on the existing heads with your stamp tool, copying the surrounding background to make it appear to extend over the edges of the heads to make them disappear. You do not have to do the entire head, only enough of the edge so that when you switch heads, the old head will not be showing from behind  the new head.

Because you are working on a new layer, you can erase and restart as many times as you need in order to get this looking good.

Once that is done, make the new heads layers visible and move them into their new location.

The methods that I have shown you are considered "best practices." This is because you can always come back and undo anything that was done before and make changes. Your original is still intact on the background layer. And the changes on the additional layers can still be edited as needed.

Good luck, and have fun.

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