The Nastavení JPEG / JPEG settings dialog box appears when you press the JPEG Nastavení ... / settings... button on the Uložit obraz jako / Save Image As dialog box. It lets you control attributes of the JPEG image file.
Kvalita obrazu / Image quality
The text field and its associated slider control the tradeoff
between JPEG image file size and image quality. Lower quality settings tend to
reduce file sizes.
NOTE: Extremely high quality settings may produce large files with minimal improvements in image quality. In general, there may be diminishing returns for values higher than 75%.