Moiré pattern

[jbarth-ubhd]

• I am the author or maintainer of this manifest: Yes
• URL: https://digi.ub.uni-heidelberg.de/diglit/iiif/mod_kunst1888/manifest.json , e. g. 63th scan
• Manifest hosting institution: University Library Heidelberg

Observed behavior

• Description: Moiré pattern not from iiif server (cantaloupe with bicubic filter, but without gamma correction), but from mirador asking for 512 px² tiles and scaling them in browser - perhaps to get a smooth zooming experience.
• Screenshots / screen recordings / GIFs

(Screenshot from Firefox, rotated by 90° clockwise)

Image is the same as https://digi.ub.uni-heidelberg.de/diglit/mod_kunst1888/0063 (presentation without adequate image processing, too; JPGs with gamma correction and filtering)

[jbarth-ubhd]

pica seems to have WebAssembly, ~~Gamma correction and~~ Lanczos filter. Oh.., and Web worker.

[jbarth-ubhd]

I've opened a ticket at pica: Gamma correction?