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1. [Knowledge Base](https://support.lumion.com/knowledge-base?hsLang=en-us)
2. [Material Questions](https://support.lumion.com/knowledge-base/material-questions?hsLang=en-us)
3. [Materials in versions 12 and earlier](https://support.lumion.com/knowledge-base/material-questions?hsLang=en-us#materials-in-versions-12-and-earlier)
# How do you make some parts of a material more emissive?
## 
## **1. Here's how**
You will need a special *Color Map* texture with an *Alpha Channel* in order to make some parts of a *Standard Material* more emissive than others.
A *Color Map* (Diffuse) texture has normally got 3 channels: red, green and blue.
In addition to the red, green and blue channel, you can add a socalled *Alpha Channel* to the texture if you've got Adobe Photoshop, GIMP or a similar image editor.
The *Alpha Channel* can be used for 3 different purposes in Lumion:
- Making some parts of a material more or less transparent.
- Making some parts of a material more or less reflective.
- Making some parts of a material more or less emissive.
In this article we will focus on the third option, i.e. making some parts of a material more or less emissive than others.
**1.1:** If you are using Adobe Photoshop, please click on the link below to see how to add an *Alpha Channel* to an image:
**External Link:** [Adobe Photoshop Help: Create and edit alpha channel masks](https://helpx.adobe.com/photoshop/using/saving-selections-alpha-channel-masks.html#create_and_edit_alpha_channel_masks)
**1.2:** Then either paste an *Emissive* mask or paint the *Alpha Channel*. The intensity of the emissiveness depends on how bright the pixels are in the *Alpha Channel*. There are 255 levels ranging from pure black (not emissive at all) to pure white (fully emissive). Grayscale tones between black and white will result in more or less emissiveness in *Lumion*:
**1.3:** Once you've added the *emissive mask* to the *Alpha Channel* of the texture, please click on the link below to see how to save it to a 32-bit *Color Map* texture in TGA, BMP or TIFF format.
**External Link:** [Adobe Photoshop Help: Save files in graphics formats](https://helpx.adobe.com/photoshop/using/saving-files-graphics-formats.html)
**1.4:** Then open *Lumion* and add a *Standard Material* to the surface:
**1.5:** Assign your *Color Map* texture with the *Alpha Channel* to the *Color Map* slot in the *Standard Material*:
**1.6:** If the full settings are not shown, then click on the *Show more* button:
**1.7:** Click on the *Settings* tab and then the third *Texture Alpha* button:
**1.8:** Adjust the *Emissive* slider as desired.
A low value brightens the *Material* and a high value makes it glow.
## **See also:**
- **Knowledge Base:** [What do the properties of the Standard Material mean in Lumion 11 and newer versions?](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/360017415779.json?hsLang=en-us)
- **Knowledge Base:** [What do the properties of the Standard Material mean in Lumion 10 and newer versions?](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/360036721534.json?hsLang=en-us)
- **Knowledge Base:** [What do the properties of the Standard Material mean in Lumion 9.5 and older versions?](https://support.lumion.com/knowledge-base/api/v2/help_center/en-us/articles/360003455634.json?hsLang=en-us)
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