# Duotone
Create a duotone effect by using **duotone=C1,C2\[,Y]**, where **C1** and **C2** are the colors for the duotone (hex value or color name) and **Y** is the opacity (`Y=0..1`, default`1`).
**duotone=C1,C2\[,Y]**
| Preview | Syntax |
| ------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 
| Original image:
/samples.scaleflex.com/mountains.jpg?w=400
|
| 
| By default, the image is desaturated first:
/samples.scaleflex.com/mountains.jpg?w=400&duotone=000080,ffff00
|
| 
| If you prefer, you can convert to grayscale instead:
/samples.scaleflex.com/mountains.jpg?w=400&duotone=000080,ffff00&gray=1
|
| 
| 60% opacity (0.6) of the filter:
/samples.scaleflex.com/mountains.jpg?w=400&duotone=000080,ffff00,0.6
|
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