Here is a color palette based on your request for high contrast colors suitable for a typographic poster with a theme of hope:

json
{
  "palette_name": "Hopeful Contrast",
  "colors": [
    {
      "name": "Bright Yellow",
      "hex_code": "
          
          #FFEA00
       "
    },
    {
      "name": "Deep Blue",
      "hex_code": "
          
          #003DA5
       "
    }
  ]
}

Palette Description

The “Hopeful Contrast” palette features a bright yellow that symbolizes optimism and joy, paired with a deep blue that conveys trust and stability. Together, these colors create a striking contrast that captures attention and evokes feelings of hope.

Would you like to explore more color combinations or need assistance with anything else?