Short answer: There is no widely used image format called “.odd”. You probably meant DNG (a RAW photo format) or a document/vector format like .odt/.odg. This page explains each possibility, how they differ from PNG, and how to convert.
Definitions
- PNG — Portable Network Graphics. A lossless raster image format commonly used for web graphics, screenshots, logos, and images requiring transparency.
- DNG — Adobe Digital Negative. An open RAW camera format holding sensor data for high-quality editing. (If you typed "Odd" you might have meant this.)
- .odt / .odg — OpenDocument Text / Drawing files (documents or vector drawings created by LibreOffice/OpenOffice). These are not raster images but can be exported to PNG.
- “.odd” — Not a standard image extension. If you have files with that extension, they may be proprietary or misnamed; inspect their origin.
Comparison: DNG (or documents) vs PNG
DNG → stores raw camera sensor data, large, meant for editing and archiving. PNG → stores processed pixel data, lossless, supports transparency, used for final delivery and the web.
.odt/.odg → are document/vector files. They can contain text, shapes, or vector drawings — not raw pixels — so conversion to PNG rasterizes the content.
What is PNG?
PNG (Portable Network Graphics) was developed in the 1990s as a patent-free replacement for GIF. PNG uses lossless compression (DEFLATE) and supports features that make it ideal for web graphics and user-interface imagery.