Blending Images

Step 1. Open a photo that will act as the background for your composite.

Open a photo that will act as your background.

Step 2. Drag the tachometer photo over on top of your background photo.

Open the second photo (the one you want to composite with your background photo). Get the Move tool (V) and drag this photo on top of your background photo (as shown here). It's on its own layer, so drag it a bit over to the right so it extends off the edge of the document (basically, just position it like you see here). You'll see a hard edge where the tachometer photo ends, and that's what we're going to work on smoothly blending these two photos together so you don't see that hard edge just a smooth, gradual blending of the two images.

Step 3. Add a layer mask

Now, go to the Layers palette and click on the Add Layer Mask icon (as shown here). This adds a white layer mask, since when it comes to channels (and masks) a white channel shows everything. (There's that saying again: "White reveals," right?) That's why adding this layer mask doesn't affect the image at all the white reveals the entire layer, so it looks just like it did before you applied the layer mask.

Step 4. Get the gradient tool, choose the black-to-white gradient, drag from left to right.

Get the Gradient tool (G), then click on the Gradient Picker up in the Options Bar (or press Return [PC: Enter]). When it appears, double-click on the third gradient the black-to-white gradient to choose it. Now, click the Gradient tool right on your image at the spot where you want your tachometer image to be completely transparent (near the left edge of that photo), then drag to the right until you reach the spot where you want it to appear fully solid. I added a white arrow so you can see where I started, and in which direction I dragged (from the left edge to near the right edge).

Step 5. This adds a gradient to your mask, which blends from transparent to solid.

If you look in the Layers palette, you'll see a black-to-white gradient now appears in the layer mask thumbnail (as shown here). Remember, this layer mask was all white before, and you could see the entire photo, so the white areas in the gradient will still show the full photo. However, as the gradient turns gray as it moves to the left, the parts of the tachometer under that light gray area will start to become transparent. As the gradient moves farther to the left, the grays get darker, and your tachometer becomes even more transparent. When it reaches black, the parts of the tachometer under that area become completely transparent (because black conceals).

Step 6. Get the brush tool and paint in black over the area that you want concealed (like the knob).

So, this gradient creates a smooth blend from solid (on the far right) to fully transparent (on the far left). Now, if you want to edit your layer mask, it's simple, grab the Brush tool (B), choose a soft-edged brush, press X to set your Foreground color to black, and start painting. For example, if you look just below the bottom left side of the tachometer, you can see a faint knob. If you want that knob to disappear (become fully transparent), just paint over it in black (remember, painting in black conceals things so paint over that knob, and any other stray parts, like the oil gauge).

Step 7. To see more of the tachometer, paint over it in white, then undo (it's just an example).

Now, what if you decide you want more of the tachometer to be solid? Then you simply press x to switch your foreground color to white, and begin painting over the inside of the tachometer. As you paint, you're revealing the photo on that layer (as shown here)you're revealing more of that photo that was hidden under the black part of the gradient. now that you see how that works, keep pressing command-option-z (pc: control-alt-z) until your white brush strokes are undone (that's the keyboard shortcut for multiple undos). For this particular composite, you actually want the tachometer to appear pretty transparent, like it was before painting in white.

Step 8. Drag the gearshift photo on top and position it on the left side.

Open the third photo (the close-up of the gearshift), use the Move tool to drag it onto your main image, and position it over to the left side (as shown here).

Step 9. Add a layer mask

Go to the Layers palette and click on the Add Layer Mask icon to add a layer mask (as shown here). Again, nothing happens when this white layer mask is added because (come on now…everybody sing along) "white reveals." So, adding that mask didn't cover anything the photo is fully revealed.

Step 10. Drag the same black-to-white gradient from right to left

Get the Gradient tool again, but this time drag from the right back to the left edge (as shown here). The point you started at will become transparent, and the point you stop dragging at will be solid.

Step 11. This blends the image. now move both photos out toward the edges more to finish off.

Once you release the gradient tool, the gearshift photo now blends in smoothly. if you want more of the gearshift visible, paint over those areas in white. If you want more transparency, paint on the right side of the gearshift in black, because black will conceal what's on that layer. To finish things off, get the move tool and drag the tachometer a little bit over to the right. then, drag the gearshift a little bit over to the left, revealing more of the car in the center.