Photoshop Knockout Background

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This article on how to remove a background in Photoshop remains one of our most popular posts, and was updated in 2018 for current Photoshop users.

Photoshop offers many different techniques to remove a background from an image. For simple backgrounds, using the standard magic wand tool to select and delete the background may well be more than adequate. For more complicated backgrounds, you might use the Background Eraser tool.

The Background Eraser Tool

The Background Eraser tool samples the color at the center of the brush and then deletes pixels of a similar color as you “paint.” It feels like painting with acid. Let me show you how it works.

Remove a Background, Step 1: Open your Image

Start by grabbing an image that you want to remove the background from. I’ll be using this image as it features areas that range from easy removal through to more challenging spots.

Remove a Background, Step 2: Select Background Eraser

Select the Background Eraser tool from the Photoshop toolbox. It may be hidden beneath the Eraser tool. If it is, simply click and hold the Eraser tool to reveal it.

Remove a Background, Step 3: Tune Your Tool Settings

On the tool options bar at the top of the screen select a round, hard brush. The most appropriate brush size will vary depending on the image you’re working on. Use the square bracket key ([ or ]) for quickly scaling your brush size.

Next, on the tool options bar, set the Sampling to Continuous, the Limits to Find Edges and a Tolerance of somewhere between 20-25% is a good starting place.

Note: A low tolerance limits your eraser to areas that are very similar to your sampled color. A higher tolerance expands the range of colors your eraser will select.

Remove a Background, Step 4: Begin Erasing

Bring your brush over your background and begin to erase. You should see a brush-sized circle with small crosshairs in the center. The crosshairs show the “hotspot” and delete that color wherever it appears inside the brush area. It also performs smart color extraction at the edges of any foreground objects to remove ‘color halos’ that might otherwise be visible if the foreground object is overlayed onto another background.

Note: For the example image, I actually used a rather high Tolerance than the 20-25% recommended above due to the wide range of blues behind this subject.

When erasing, zoom up your work area and try to keep the crosshairs from overlapping on the edge of your foreground. It’s likely that you will need to reduce the size of the brush in some places to ensure that you don’t accidentally erase part of your foreground subject.

Remove a Background, Step 5: Choosing Effective Limit and Sampling Settings

Even though I have used a smaller brush to work around the hair and neck area, the Background Eraser has still managed to gouge a few chunks out of the hair and shirt.

For foreground image areas that share colors with the background (like this one), you may need to adjust the Sampling and Limits. In this picture, I switched over to the Sampling: Once option, set my Limits to Discontinguous and set my Tolerance to 30%.

The Sampling: Once option samples the color under the crosshair only the moment you click and it doesn’t resample as you move your brush along. The Discontiguous Limit option allows you to erase all pixels that match the sampled color that you’re erasing. This allowed me to get in between the hair strands without erasing them.

There’s a good chance the Background Removal Tool may be all you need to complete your task.

But if not, read on.

Remove a Background, Step 6: Quick Mask or Pen Tool

While removing the background on our example image is mostly straight-forward due to the fairly solid background, there are inevitably areas of our foreground subject that get wrongly erased as we work close to foreground’s edges.

In our example, the foreground and background share similar colors due to the lighting. This will be easiest to repair using Photoshop’s Pen tool. I only have a small section I need to touch up, so I’ll use the Pen to create a clean selection and delete the unwanted background.

Here’s the finished result:

Final Word

If you are working with a basic image with ample visual contrast between the subject and background, you can most likely get away with using only the Background Eraser Tool.

More complex images will likely require a mix of tools, samplings, and tolerances along with occasional manual touch-ups. There will be times when there is no visual difference between the foreground and background. We have to manually impose that distinction.

And don’t forget that if you are saving your image without adding a new background, you need to save it as a PNG to maintain the transparency.

Want more design and UX tips? Check out our library of design & UX books!

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Description

The easy way to cutout(especially complex hair edge cutout) and composite photos, change background and apply effects to your photos.
*MULTIPLE CUTOUT TOOLS
-The automatic cutout tool: You just need to circle the object that you want to cut out, make a sticker out of any photo easily!
-Manually selection tools: Lasso, instant alpha, eraser, a lot of manual tools to cutout if you are not satisfied with the result of the automatic cutout tool.
-The new 'Hair Refine' and 'Edge Refine' tools, offering you a first glimpse of how much easier it could be to select hair, fur and other fine details in an image.
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What’s New

-Fix the bug that make crashes while using the eraser features.
-Performance improvement.

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Usually I have to get on a computer to do my editing, but my family hardly gets off the computer. So I downloaded a bunch of apps like mobile pixlr, edits, and etc (none of them worked) But one day, I was reading a webtoon when I read that photoshop would be a great keyword. Then I scrolled down a bit, found some bad reviews about this app, and tried it out. I think the reason why people are giving this bad reviews is because they're too impatient to wait and go through the details. It's a great app, and it's just what I needed!

Love the app but don’t buy the full version until they fix..

I absolutely love this app but at some point a change was made and now when I try to save a superimpose image it the pic has a line about 1/4 of the way down and then the picture starts over and I lose about 1/4 of the picture at the bottom. I bought that full version thinking that would fix it but it doesn’t. The superimpose was my favorite feature so I’m probably canceling the full subscription but I do love all of the other features. If the developer fixes the issue with superimpose this app would get 5 stars from me and I would keep the full version.

I mean it doesn't do what I got it for..

I got this app for one reason: custom stickers. And when I hit save, it doesn't give me the sticker. 'Custom' in the iMessage app is always empty. I repeatedly hit 'save sticker' and it told me it did, but it didn't. Edit: it DOES add your custom stickers, but not automatically, you have to take an extra step. And even at that point they aren't actually stickers. You can just tap them and they send as a text. You can't use them as stickers. This app has no stickers at all. Edit #2: Thanks to the devs for the quick response, I look forward to the custom stickers!

Developer Response,

Thank you for your feed, we will fix this issue in the next version, thanks.

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Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

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