Convert otb to dcx

What is the difference between .otb and .dcx?

Name: Nokia Over The Air Bitmap Image; ZSoft IBM PC Multi-Page Paintbrush Image

Description: The OTB (Nokia Over The Air Bitmap Image) file format is a type of image file developed for use on Nokia mobile devices. These files are specifically optimized for efficient transmission and display on Nokia phones, particularly older models. The OTB format is designed to be compact to facilitate over-the-air (OTA) transmission, which was an essential feature in the era of limited bandwidth and data transfer capabilities. The format supports monochrome graphics, making it suitable for simple images like icons and logos.; DCX file is a multi-page image file developed by raster file or bitmap file formats. It is generated fro PCX files, so it has a small header that shows the .dcx then a sequence of .pcx data. Popularly used by applications to create and send multi-page fax files.