# Blending
Multiple projectors are often used to create a seamless video image on a Projection Surface. For calibrating multiple projectors TACHYON features automatic edge blending, a process through which the projected images are altered to seamlessly blend into one another.
TACHYON automatically calculates Blending masks on load of the project. The only action a user can take is to recalculate the blending (after a calibration change for example) (once the Calibration process is complete Blending masks are saved and applied to the video outputs)
## Enable Blending and Select Blending Mode
Make sure the 3D Scene module’s current mode is set to **{Calibration}** **`2`** .
1. To open the Blending Panel, click on the **`B`** button located in the top-right corner or the 3D Scene window.
2. Click the **`Enable`** toggle to activate Blending.
3. Select **{Static Blending}** from the Blending mode dropdown menu
4. Press the **`Compute Mask`** button: the Blending mask will be calculated every time you click on this button, making it possible for you to recalculate masks if there are changes in the Calibration.
{% hint style="info" %}
Blending can also be enabled/disabled from quick option bar in the calibration tools by pressing the **{B}** icon toggle.
{% endhint %}
