Simulate Drag Shutter Effect in Photoshop

Sometimes I want to “dress-up” an otherwise decent photo to create something special. Of course its always better to have a strategy for this at the time of the shoot, but often one doesn’t have time, or resources, or one re-visits an image and just gets a better idea. Such was the case with this image, which was originally done for a video game package design that I was not in charge of. You can find a blog post about the original shoot here!

Dancer

The assignment here was to capture some dance action on a plan gray background for potential use in packaging for the video game “Dance Dance Revolution.”

My new thought was to place the dancer into a fun high-enegry environment like a wild disco. I didn’t have any wild disco shots, however I did have some interesting images taken at the Neon Photo Walk in Las Vegas. I settled on a slow shutter Lensbaby shot taken on Fremont Street.

Fremont Blur

I shook the camera during a slow shutter speed of 1/8th to get this kinetic splash of color.

The next task was to mask the subject to isolate her from the original background. First I use the Magic Wand tool & click in the background to quickly select everything but the figure.

Magic Wand selection

The Magic Wand tool is great for selecting a simple even toned background – simply inverse the selection to select the figure.

Now I choose Inverse from the Select Menu & then entered Quick Mask mode to fine tune the selection.

Inverse-Quick Mask

Inversing the selection selects the figure and Quick Mask makes the selection visible as a colored mask for further editing.

Now I like to change the Quick Mask color by selecting Quick Mask Options from the Channel Panel’s options fly-away menu at the upper right corner of the Channels Panel – the resulting dialog lets you pick a color and an opacity to represent masked areas. In this case, I picked a color similar to the dominant color of the new background image so I could more easily see how the edges blend in the mask.

Quick Mask Color

You should pick a color with enough contrast to both the subject and the original background, so that you can clearly see edge details.

There are almost always little defects in the selection that can be easily painted out – in this case small areas inside the figure are being masked out and simply need to be painted over with white in the Quick Mask. For this subject, I only concentrated on the hard edges and pretty much ignored the hair, because I will use a different method of blending to get hair wisp details.

Mask Defects

Paint out small defects in the mask.

Once I have the selection detailed, I duplicate the original to a new layer and click on the Refine Edge button to finish up the selection – you can see a more detailed step-by-step tutorial on this process in my YouTube video here.

Refine Edge

Click the Refine Edge button to get a better mask edge.

I simply set a 10-pixel radius for edge detection in the resulting dialog and then clicked “OK” – again I was completely unconcerned with the hair. The result is shown below:

Masked Figure

The mask is detailed everywhere except the hair – to preserve all the fine hair wisps I will use another technique.

So, right now I have two duplicate layers of the dancer – the top one is fully masked, the bottom is the original unaltered layer – I’m going to use this one for the hair wisps. The original bottom image is shot against a plain gray background, I now need this gray to become as close as possible to a level 128 gray. So I make a curves adjustment layer and make sure its clipped to the underlying layer. I then adjust the curve so that the background tone right behind the hair reads 128 in all three channels.

Force Background gray

The curve adjustment forces the background tone to be 128 gray – this is a neutral color for Overlay, Softlight, and Hardlight blend modes, so it will completely disappear when she is blended over the Background – I will use Hardlight mode!

Next I select all three layers…

Figure Layers

Shift-click to select all three layers.

and then select “New Group from Layers” from the Layer Options fly-away menu…

New Group from Layers

New Group from Layers

The Layers are now contained in a “Group” represented by a little folder icon in the Layers stack. This Group can be treated as if it were one layer!

Layer Group

The Layer Group can be dragged onto the new background as if it were a single layer.

Now simply drag the Group out of the figure document by click-dragging, from inside the window with the Move tool, up to the Tab for the new background & down into the new Background window.

Figure Group on New Background

The figure Group is now on top of the new background image.

Now I select the bottom figure layer (the one without a mask) and change the Layer Apply Mode to Hardlight, using the blend mode drop down menu.

Hardlight Blend Mode

Hardlight blend mode will drop out the gray background from the bottom figure layer.

The gray background of the bottom figure layer completely disappears where it is exactly 128 – there are a few spots at the edges where it is subtly visible but these can be masked – we only need to preserve the parts of this layer where the hair lives!

Blended figure group

The edges of the figure group need to be blended – we will do that with a mask in the bottom figure layer.

I now select the bottom figure layer, and make a layer mask where I can paint with black to mask off the edge and leave jsut the part with the hair.

Bottom Layer Mask

The mask for the bottom figure layer

Now I select the top figure layer, and because I don’t want to mess with the existing mask (because I want to protect it from mistakes), I select “New Group from Layers” from the Layer Options fly-away menus at the upper right of the Layers Panel. This puts the layer with its mask into a group that I can attach another mask to. Now I simply paint out the hair wisps with black in the group mask.

Top figure group mask

The top figure group mask hides the unmasked hair from the top figure group so the the hair wisps from the bottom figure “Hardlight” layer can show against the new background.

The result is a completely seamless blend of the very fine hair wisps with the new background. I show a very detailed step-by-step video tutorial on YouTube here.

Blended Hair Wisps

The fine hairs wisps blend naturally into the new background in a convincingly natural way!

Next I use the mask of the top figure layer (inside the group) to create a mask fro and adjustment that darkens the background in a way that suggests the type of shadow effect you would get from the drag shutter effect. When you use a slow shutter speed with flash front light against a continuous light background, you get a shadow where the moving subject is displaced during the exposure.

Drag Shutter Shadow

Dragging the shutter is a term used when you shoot with a slow shutter speed with flash – it can create a distinctive “shadow effect” against a bright background.

Next I add a motion blurred hair layer underneath everything as an additional “hair shadow” to help sell the effect. To help separate the dark hair from the background, I lightened the background & cooled it off a bit with a curve adjustment.

Final Figure

The final figure with edge shadow, extra hair shadow, and lightened background

The Layer stack looks like this in the end.

Final Layer Stack

The final layer stack – I always make sure to label everything before I quit so I can return to the document and re-edit as necessary! It definitely helps me remember what I did.

Here is the completed Image!

Final Image

Final Image

I hope this gives you an idea for your own images. I now prefer to shoot on a medium gray background, whenever possible because it gives me so much flexibility with how I can treat the background. This image combines two scenes that were shot in completely different ways with radically different lenses but somehow manages to look fairly convincing. Although a real drag-shutter shot can be awesome, it is very difficult to control and the best shots are often happy accidents. Using this approach you can craft the image exactly the way you want it with complete control over all the elements.

 

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