300~600dpi png scans not filtered sufficiently to avoid overfiltering and save time to manual editing. they usually posted with fixme tag and need at least one more filtering with manual masking and manual dust cleaning. they also intend screening bleed_through scanning_dust paper_texture, but unnecessary to add those fault tags.

Greycstoration on 16bti/c with high anisotropy setting is a recommended filter.

Updated by midzki about 14 years ago