MobileRead Forums - View Single Post - How to turn all images in Kobo Forma to grayscale (to save space & speed xp)

ratinox · 10-15-2019, 01:47 PM

If these are not CBZ/CBR files then converting to greyscale probably isn't going to help much overall. If these are CBZ/CBR files then transcoding may be beneficial. Or it might not. There's very much an "it depends" involved. But for the most part I get good results with ImageMagick:

Code:

KX=1440; KY=1920
GREY="-type Grayscale -level 0%,100%,0.6"
BLUR="-gaussian-blur 0.05"
TRIM="-trim +repage"
FUZZ="-fuzz 1%"
mogrify -verbose -strip -format jpg -quality 85% ${FUZZ} ${TRIM} ${BLUR} -filter Lanczos -resize ${KX}x${KY} ${GREY} *

But realistically? I read my comics and manga on my iPad Mini now.

10-15-2019, 01:47 PM	#10
ratinox Guru Posts: 767 Karma: 10000000 Join Date: Oct 2016 Location: Somewhere in Time Device: Forma, iPad Mini	If these are not CBZ/CBR files then converting to greyscale probably isn't going to help much overall. If these are CBZ/CBR files then transcoding may be beneficial. Or it might not. There's very much an "it depends" involved. But for the most part I get good results with ImageMagick: Code: KX=1440; KY=1920 GREY="-type Grayscale -level 0%,100%,0.6" BLUR="-gaussian-blur 0.05" TRIM="-trim +repage" FUZZ="-fuzz 1%" mogrify -verbose -strip -format jpg -quality 85% ${FUZZ} ${TRIM} ${BLUR} -filter Lanczos -resize ${KX}x${KY} ${GREY} * But realistically? I read my comics and manga on my iPad Mini now. Last edited by ratinox; 10-15-2019 at 02:12 PM.