Progressive Graphics File
PGF (Progressive Graphics File) is a wavelet-based bitmapped image format that employs lossless and lossy data compression. PGF was created to improve upon and replace the JPEG format. It was developed at the same time as JPEG 2000 but with a focus on speed over compression ratio.
| Filename extension |
.pgf |
|---|---|
| Internet media type | image/x-pgf |
| Magic number | 504746h (ASCII PGF) |
| Developed by | xeraina GmbH |
| Initial release | 2000 |
| Latest release | 7.21.7 2021 |
| Type of format | wavelet-based bitmapped image format |
| Extended from | JPEG, PNG |
| Open format? | LGPLv2 |
PGF can operate at higher compression ratios without taking more encoding/decoding time and without generating the characteristic "blocky and blurry" artifacts of the original DCT-based JPEG standard. It also allows more sophisticated progressive downloads.
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