The Colors page allows you to modify the terminal palette and colors for different text styles.
Use Background Color to Erase Screen
Not all terminals agree on what color to turn the screen when the server sends a ‘clear screen’ sequence. Background-color erase can be turned on and off by control sequences sent by the server. This configuration option controls the default state.
Allow Terminal to Specify ANSI Colors
If it is disabled, PuTTY will ignore any control sequences sent by the server to request colored text.
Allow Terminal to Use xterm 256-Color Mode
If disabled, PuTTY will ignore any control sequences sent by the server which use the extended 256-color mode supported by recent versions of xterm.
Bold Text is a Different Color
If disabled, bold and non-bold text will be displayed in the same color, and instead the font will change to indicate the difference.
Attempt to Use Logical Palette
If you are not getting the colors you ask for on an 8-bit display, you can try enabling this option.
Use System Colors
Enabling this option will cause PuTTY to ignore the configured colors for ‘Default Background/Foreground’ and ‘Cursor Color/Text’, instead going with the system-wide defaults.