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koreader/resources/icons
..
src
README.md
appbar.align.auto.png
appbar.align.center.png
appbar.align.justify.png
appbar.align.left.png
appbar.align.right.png
appbar.arrow.enter.png
appbar.arrow.left.up.png
appbar.arrow.shift.png
appbar.book.open.png
appbar.cabinet.files.png
appbar.checkmark.thick.png
appbar.checkmark.thick.unchecked.png
appbar.chevron.first.png
appbar.chevron.last.png
appbar.chevron.left.png
appbar.chevron.right.png
appbar.chevron.up.png
appbar.clear.reflect.horizontal.png
appbar.column.one.png
appbar.column.three.png
appbar.column.two.large.png
appbar.column.two.png
appbar.control.collapse.png
appbar.control.expand.png
appbar.crop.large.png
appbar.globe.wire.png
appbar.grade.b.large.png
appbar.home.png
appbar.magnify.browse.png
appbar.page.corner.bookmark.png
appbar.page.text.png
appbar.plus.png
appbar.pokeball.png
appbar.settings.large.png
appbar.settings.png
appbar.spacer.png
appbar.text.size.large.png
appbar.tools.png
appbar.transform.rotate.right.large.png
appbar.wifi.png
dogear.png
eink_cmap.gif
koicon.wifi.open.0.medium.png
koicon.wifi.open.25.medium.png
koicon.wifi.open.50.medium.png
koicon.wifi.open.75.medium.png
koicon.wifi.open.100.medium.png
koicon.wifi.secure.0.medium.png
koicon.wifi.secure.25.medium.png
koicon.wifi.secure.50.medium.png
koicon.wifi.secure.75.medium.png
koicon.wifi.secure.100.medium.png
menu-icon.png
stats.star.empty.png
stats.star.full.png

README.md

menu-icon.png is post-processed with:

convert menu-icon.png -grayscale Rec709Luma -dither Riemersma -remap eink_cmap.gif -quality 75 png:menu-icon-grayscale.png

The intent being to grayscale, dither down to the 16c eInk palette, and save as a 16c paletted grayscale PNG. Start from an RGB copy of the image if you end up with a 256c or sRGB PNG (check via IM's identify tool).

See https://www.mobileread.com/forums/showpost.php?p=3728291&postcount=17 for more details ;).