Flatting plug-ins for Photoshop

In the production of comics a special trapping method, called "Flatting" is used. The colored area's are butted against each other under the line art. Without special tools, this can take a long time to do.

Flatten Pro & MultiFill

The MultiFill and Flatten Pro plug-ins assist in "Flatting" and can save a lot of time. You start with MultiFill, which gives every area in the image a distinct color. Then the Flatten Pro plug-in expands all these areas until they meet and no black line-art is left in the image.

The result of Flatten Pro is an image with flats that perfectly line up with your artwork. You can easily select each flat area for coloring.

The MultiFill plug-in starts with a dialog where you can select parameters that control how and what is painted.


Here is a small example of using these plug-ins. You start with your artwork, copy it to a new layer and for best results, make sure you don't have anti-aliasing. This makes it easier for MultiFill to paint the white areas in your image. Then you apply the MultiFill filter and then the Flatten Pro filter. After that, you can start coloring your image.

Using Flatten Pro and MultiFill

Find out more details about the plug-in parameters and usage hints:

Buying Flatten Pro

To use Flatten Pro, you need to buy a license code. Flatten Pro is available for macOS and Windows. Choose the operating system you use most often when buying. If you use both Mac and Windows, or if you want to switch platform, you can request an additional license code free of charge.


Flatten Pro Mac

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Flatten Pro Windows

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The shopping process is handled by Paddle.com, when you click the Buy buttons, a popover screen from Paddle will appear.


January 2019, The MultiFill and Flatten Pro plug-ins have been updated to v2.0. The Flatten Pro plug-in now has a dialog where you can specify some new parameters. MultiFill has a newly made dialog on Windows. MultiFill can now use the background and foreground colors for the fill-color and flag-color.

March 2016, The MultiFill plug-in has been updated to v1.12. This release fixes some problems using color palettes.


The plug-ins work in any version of Photoshop since Photoshop 6 on Windows and Mac. The plug-ins do not depend much on the version of Mac OS or Windows, if Photoshop works, then the plug-ins should work as well. Use the download wizard to find the correct version of the plug-ins for your version of Photoshop.

The image mode in Photoshop must be RGB or CMYK with 8 bits per channel. Though there is no support for 16 bits per channel, please contact me if you need it.

Free Trial for Flatten Pro

You can try out the plug-ins for free, to see if they are useful for you and to verify that they work in your workflow. Just download and install the plug-ins and Flatten-Pro will work in demo mode. MultiFill is always free to use.

The Flatten Pro plug-in runs in demo mode until you enter a valid serial number. This demo mode is limited to 1024x1024 pixels. Larger images will be partially processed. Only the top left 1024x1024 pixels are done. The rest of the image will remain as it was.


Some enthusiastic users have made tutorials of using the plug-ins that you may find useful. You can find some links on the See the resources page.

Download the plug-ins