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it displays very well on my kindle touch
convert in_filename.png -filter LanczosSharp -resize 300x400 -background white -gravity center -extent 600x800 -colorspace Gray -dither FloydSteinberg -quality 75 -define png:color-type=0 -define png:bit-depth=8 out_filename.png
Next step i will perform above command in batch, yeah. Many thanks NiLuJe for your help
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