Calculate factor corresponding to quality Args: quality(float): Quality for jpeg compression. Returns: float: Compression factor.
(quality)
| 30 | |
| 31 | |
| 32 | def quality_to_factor(quality): |
| 33 | """ Calculate factor corresponding to quality |
| 34 | |
| 35 | Args: |
| 36 | quality(float): Quality for jpeg compression. |
| 37 | |
| 38 | Returns: |
| 39 | float: Compression factor. |
| 40 | """ |
| 41 | if quality < 50: |
| 42 | quality = 5000. / quality |
| 43 | else: |
| 44 | quality = 200. - quality * 2 |
| 45 | return quality / 100. |
| 46 | |
| 47 | |
| 48 | # ------------------------ compression ------------------------# |