If checked, a Gaussian blur will be applied to the image, making it less clear.
Sepia
If checked, the filter reproduces the effect of aging in old, traditional black-and-white photographs, toned with sepia (shades of brown).[16] To achieve this effect, the filter desaturates the image, reduces brightness and contrast, and modifies the color balance.[17]
Example for the „Mottle“ option
Flatten image
[14] See Wikipedia [WKPD-SEPIA].
[15] Compare 8.2 – „Color Balance“.
[16] See Wikipedia [WKPD-SEPIA].
[17] Compare 8.2 – „Color Balance“.