Can't get image transparent back ground

I’m using a Teensy 4.0 with a 480x320 LCD on LVGL v7.7.1

I have PGN image that has a transparent background. I’ve checked using photoshop.

I then use the online tool

to convert to c file and put it in the lvgl project but on the LCD it does not give a transparent back ground.
It is showing black as the background.

How can I fix this ?

try this


That works.

Thank you very much.