Config-template-card change opacity

Configuration
,
1

hello

I need to change a picture opacity in config-template-card.
I have a following code:

  - type: custom:config-template-card
    variables:
      C: states['sensor.ga_kazan_temperature_4_pump_furnace'].state
      CUTOFF: states['input_number.kazan_on_temperature'].state
    entities:
      - sensor.ga_kazan_temperature_4_pump_furnace
      - input_number.kazan_on_temperature
    card:
      type: picture
      image: /local/pic/futes/fire.gif
    style:
      top: 79%
      left: 91%
      width: 7%
      opacity: ${C-CUTOFF}

if i change manually the opacity the picture is appearing and despairing as i expecting.

  • opacity: -4
  • opacity: -0.3
  • opacity: 0.5
  • opacity: 4

But not with ${C-CUTOFF}
If i print out the value for ${C-CUTOFF} is “-4” but the picture still visible. I wonder what is the problem here?

As a workaround i just changing the picture:

      image: >-
        ${ C-CUTOFF>0 ? '/local/pic/futes/fire.gif' :
        '/local/pic/futes/fire-black.gif'}

thank you

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