stb-image-djvul demo.

DjVu Layered - image bundle on the mask + foreground + background using "Multi-scale binarization".

Degradation of images on layers mask, foreground and background by cluster analysis with a gradual decrease in block size.

demo

origin

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DjVuL

Separate image to Mask+Bg+Fg:

stbdjvul mona.jpg mona.mask.png mona.bg.png mona.fg.png 
Load: mona.jpg
image: 3036x4096:3
BG: 1012x1366:3
FG: 506x683:3
DjVuL... 11 level
Save png: mona.mask.png, mona.bg.png, mona.fg.png.

Mask:
Mask
Bg:

Fg:

Netpbm

Convert separate image to PNM:

pngtopnm mona.bg.png > mona.bg.ppm
pngtopnm mona.fg.png > mona.fg.ppm
pngtopnm mona.mask.png | ppmtopgm | pgmtopbm > mona.mask.pbm

DjVuLibre

Coding to DjVu:

cjb2 mona.mask.pbm mona.mask.djvu
c44 mona.bg.ppm mona.bg.djvu
c44 -slice 100 mona.fg.ppm mona.fg.djvu

Extract and combine chunks:

djvuextract mona.mask.djvu Sjbz=mona.Sjbz.cnk
  Sjbz=mona.Sjbz.cnk --> "mona.Sjbz.cnk" (741921 bytes)
djvuextract mona.fg.djvu BG44=mona.FG44.cnk
  BG44=mona.FG44.cnk --> "mona.FG44.cnk" (18065 bytes)
djvuextract mona.bg.djvu BG44=mona.BG44.cnk
  BG44=mona.BG44.cnk --> "mona.BG44.cnk" (101299 bytes)
djvumake mona.djvul.djvu INFO=,,300 Sjbz=mona.Sjbz.cnk FG44=mona.FG44.cnk BG44=mona.BG44.cnk

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DjVuL using Bg and Fg mask

Separate image to Mask+Bg+Fg:

stbdjvul mona.jpg mona.mask.png mona.bg.png mona.fg.png mona.bgmask.png mona.fgmask.png 
Load: mona.jpg
image: 3036x4096:3
BG: 1012x1366:3
FG: 506x683:3
DjVuL... 11 level
Save png: mona.mask.png, mona.bg.png, mona.fg.png, mona.bgmask.png, mona.fgmask.png, mona.fgmask.png.

Mask:
Mask
Bg:

Bgmask:

Fg:

Fgmask:

Netpbm

Convert separate image to PNM:

pngtopnm mona.bg.png > mona.bg.ppm
pngtopnm mona.fg.png > mona.fg.ppm
pngtopnm mona.mask.png | ppmtopgm | pgmtopbm > mona.mask.pbm
pngtopnm mona.bgmask.png | ppmtopgm | pgmtopbm > mona.bgmask.pbm
pngtopnm mona.fgmask.png | ppmtopgm | pgmtopbm > mona.fgmask.pbm

DjVuLibre

Coding to DjVu:

cjb2 mona.mask.pbm mona.mask.djvu
c44 -mask mona.bgmask.pbm mona.bg.ppm mona.bgm.djvu
c44 -slice 100 -mask mona.fgmask.pbm mona.fg.ppm mona.fgm.djvu

Extract and combine chunks:

djvuextract mona.mask.djvu Sjbz=mona.Sjbz.cnk
  Sjbz=mona.Sjbz.cnk --> "mona.Sjbz.cnk" (741921 bytes)
djvuextract mona.fgm.djvu BG44=mona.FG44.m.cnk
  BG44=mona.FG44.m.cnk --> "mona.FG44.m.cnk" (17732 bytes)
djvuextract mona.bgm.djvu BG44=mona.BG44.m.cnk
  BG44=mona.BG44.m.cnk --> "mona.BG44.m.cnk" (95094 bytes)
djvumake mona.djvul.m.djvu INFO=,,300 Sjbz=mona.Sjbz.cnk FG44=mona.FG44.m.cnk BG44=mona.BG44.m.cnk

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DjVuL and lossy mask.

DjVuLibre

Coding to DjVu:

cjb2 -losslevel 100 mona.mask.pbm mona.mask.l100.djvu
c44 -mask mona.bgmask.pbm mona.bg.ppm mona.bgm.djvu
c44 -slice 100 -mask mona.fgmask.pbm mona.fg.ppm mona.fgm.djvu

Extract and combine chunks:

djvuextract mona.mask.l100.djvu Sjbz=mona.Sjbz.l100.cnk
  Sjbz=mona.Sjbz.l100.cnk --> "mona.Sjbz.l100.cnk" (723372 bytes)
djvuextract mona.fgm.djvu BG44=mona.FG44.m.cnk
  BG44=mona.FG44.m.cnk --> "mona.FG44.m.cnk" (17732 bytes)
djvuextract mona.bgm.djvu BG44=mona.BG44.m.cnk
  BG44=mona.BG44.m.cnk --> "mona.BG44.m.cnk" (95094 bytes)
djvumake mona.djvul.l100.m.djvu INFO=,,300 Sjbz=mona.Sjbz.l100.cnk FG44=mona.FG44.m.cnk BG44=mona.BG44.m.cnk

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DjVuL using anisotropic

Separate image to Mask+Bg+Fg:

stbdjvul -a -0.5 mona.jpg mona.mask.an.png mona.bg.an.png mona.fg.an.png mona.bgmask.an.png mona.fgmask.an.png 
Load: mona.jpg
image: 3036x4096:3
BG: 1012x1366:3
FG: 506x683:3
DjVuL... 11 level
Save png: mona.mask.an.png, mona.bg.an.png, mona.fg.an.png, mona.bgmask.an.png, mona.fgmask.an.png, mona.fgmask.an.png.

Mask:
Mask
Bg:

Bgmask:

Fg:

Fgmask:

Netpbm

Convert separate image to PNM:

pngtopnm mona.bg.an.png > mona.bg.an.ppm
pngtopnm mona.fg.an.png > mona.fg.an.ppm
pngtopnm mona.mask.an.png | ppmtopgm | pgmtopbm > mona.mask.an.pbm
pngtopnm mona.bgmask.an.png | ppmtopgm | pgmtopbm > mona.bgmask.an.pbm
pngtopnm mona.fgmask.an.png | ppmtopgm | pgmtopbm > mona.fgmask.an.pbm

DjVuLibre

Coding to DjVu:

cjb2 -losslevel 100 mona.mask.an.pbm mona.mask.an.djvu
c44 -mask mona.bgmask.an.pbm mona.bg.an.ppm mona.bgm.an.djvu
c44 -slice 100 -mask mona.fgmask.an.pbm mona.fg.an.ppm mona.fgm.an.djvu

Extract and combine chunks:

djvuextract mona.mask.an.djvu Sjbz=mona.Sjbz.an.cnk
  Sjbz=mona.Sjbz.an.cnk --> "mona.Sjbz.an.cnk" (518435 bytes)
djvuextract mona.fgm.an.djvu BG44=mona.FG44.an.cnk
  BG44=mona.FG44.an.cnk --> "mona.FG44.an.cnk" (17626 bytes)
djvuextract mona.bgm.an.djvu BG44=mona.BG44.an.cnk
  BG44=mona.BG44.an.cnk --> "mona.BG44.an.cnk" (75368 bytes)
djvumake mona.djvul.an.djvu INFO=,,300 Sjbz=mona.Sjbz.an.cnk FG44=mona.FG44.an.cnk BG44=mona.BG44.an.cnk

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Compare

Djvumake:

Man djvumake:

          cjb2 mymask.pbm mymask.djvu
          djvumake my.djvu Sjbz=mymask.djvu PPM=myimage.ppm

Use mona.mask.djvu:

jpegtopnm mona.jpg > mona.ppm
djvumake mona.djvumake.djvu Sjbz=mona.mask.djvu PPM=mona.ppm

No Mask, only Bg:

c44 -dpi 300 mona.ppm mona.c44.djvu

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Result

ls -l *.djvu
  101321 mona.bg.djvu
   75390 mona.bgm.an.djvu
   95116 mona.bgm.djvu
 1339946 mona.c44.djvu
  861305 mona.djvul.djvu
  611448 mona.djvul.an.djvu
  836216 mona.djvul.l100.m.djvu
  854766 mona.djvul.m.djvu
  803208 mona.djvumake.djvu
   18087 mona.fg.djvu
   17648 mona.fgm.an.djvu
   17754 mona.fgm.djvu
  741963 mona.mask.djvu
  518477 mona.mask.an.djvu
  723414 mona.mask.l100.djvu

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