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I need to join 2 PNG images, with 16 color palette, keep colors number and order as originals.
Both PNGs use the same 16 color palette.
There is a way to create 4 bit indexed PNG with all colors, in exact order, even unused in each PNG?
Edit to be more clear:
I have 2 pictures. The first is "level-000.png":
It is identified as:
Image: level-000.png
Format: PNG (Portable Network Graphics)
Mime type: image/png
Class: PseudoClass
Geometry: 144x144+0+0
Resolution: 28.35x28.35
Print size: 5.07937x5.07937
Units: PixelsPerCentimeter
Type: Palette
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Pixels: 20736
Red:
min: 0 (0)
max: 184 (0.721569)
mean: 88.6151 (0.34751)
standard deviation: 27.9329 (0.109541)
kurtosis: 1.7675
skewness: 0.143857
Green:
min: 0 (0)
max: 199 (0.780392)
mean: 68.8957 (0.270179)
standard deviation: 22.7411 (0.0891808)
kurtosis: 18.2722
skewness: 2.87959
Blue:
min: 0 (0)
max: 111 (0.435294)
mean: 19.4671 (0.0763416)
standard deviation: 22.1775 (0.0869706)
kurtosis: 2.80475
skewness: 1.17593
Image statistics:
Overall:
min: 0 (0)
max: 199 (0.780392)
mean: 58.9926 (0.231344)
standard deviation: 24.4216 (0.095771)
kurtosis: 17.5446
skewness: 0.948025
Colors: 4
Histogram:
390: ( 0, 0, 0) #000000 black
10196: ( 67, 57, 0) #433900 srgb(67,57,0)
9770: (111, 79, 37) #6F4F25 srgb(111,79,37)
380: (184,199,111) #B8C76F srgb(184,199,111)
Colormap entries: 16
Colormap:
0: ( 0, 0, 0) #000000 black
1: (255,255,255) #FFFFFF white
2: (104, 55, 43) #68372B srgb(104,55,43)
3: (112,164,178) #70A4B2 srgb(112,164,178)
4: (111, 61,134) #6F3D86 srgb(111,61,134)
5: ( 88,141, 67) #588D43 srgb(88,141,67)
6: ( 53, 40,121) #352879 srgb(53,40,121)
7: (184,199,111) #B8C76F srgb(184,199,111)
8: (111, 79, 37) #6F4F25 srgb(111,79,37)
9: ( 67, 57, 0) #433900 srgb(67,57,0)
10: (154,103, 89) #9A6759 srgb(154,103,89)
11: ( 68, 68, 68) #444444 srgb(68,68,68)
12: (108,108,108) #6C6C6C srgb(108,108,108)
13: (154,210,132) #9AD284 srgb(154,210,132)
14: (108, 94,181) #6C5EB5 srgb(108,94,181)
15: (149,149,149) #959595 srgb(149,149,149)
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: black
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 144x144+0+0
Dispose: Undefined
Iterations: 0
Compression: Zip
Orientation: Undefined
Properties:
date:create: 2015-04-10T12:24:18+02:00
date:modify: 2015-04-09T22:33:29+02:00
png:bKGD: chunk was found (see Background color, above)
png:IHDR.bit-depth-orig: 4
png:IHDR.bit_depth: 4
png:IHDR.color-type-orig: 3
png:IHDR.color_type: 3 (Indexed)
png:IHDR.interlace_method: 0 (Not interlaced)
png:IHDR.width,height: 144, 144
png:pHYs: x_res=2835, y_res=2835, units=1
png:PLTE.number_colors: 16
png:sRGB: intent=0 (Perceptual Intent)
signature: 00d9489d55480d588c3329ab0fa844ed2a67eea06fd4dfa793503a36f9c4b160
Artifacts:
filename: level-000.png
verbose: true
Tainted: False
Filesize: 337B
Number pixels: 20.7K
Pixels per second: 0B
User time: 0.000u
Elapsed time: 0:01.000
Version: ImageMagick 6.8.9-8 Q16 x86_64 2014-11-18
The second pic is "scacchiera.png".
It is identified as:
Image: scacchiera.png
Format: PNG (Portable Network Graphics)
Mime type: image/png
Class: PseudoClass
Geometry: 144x144+0+0
Resolution: 28.35x28.35
Print size: 5.07937x5.07937
Units: PixelsPerCentimeter
Type: Palette
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Pixels: 20736
Red:
min: 67 (0.262745)
max: 111 (0.435294)
mean: 89 (0.34902)
standard deviation: 22 (0.0862745)
kurtosis: -2
skewness: -1.18433e-11
Green:
min: 57 (0.223529)
max: 79 (0.309804)
mean: 68 (0.266667)
standard deviation: 11 (0.0431373)
kurtosis: -2
skewness: 7.03683e-11
Blue:
min: 0 (0)
max: 37 (0.145098)
mean: 18.5 (0.072549)
standard deviation: 18.5 (0.072549)
kurtosis: -2
skewness: 0
Image statistics:
Overall:
min: 0 (0)
max: 111 (0.435294)
mean: 58.5 (0.229412)
standard deviation: 17.7694 (0.0696837)
kurtosis: 29.9398
skewness: -1.66976
Colors: 2
Histogram:
10368: ( 67, 57, 0) #433900 srgb(67,57,0)
10368: (111, 79, 37) #6F4F25 srgb(111,79,37)
Colormap entries: 16
Colormap:
0: ( 0, 0, 0) #000000 black
1: (255,255,255) #FFFFFF white
2: (104, 55, 43) #68372B srgb(104,55,43)
3: (112,164,178) #70A4B2 srgb(112,164,178)
4: (111, 61,134) #6F3D86 srgb(111,61,134)
5: ( 88,141, 67) #588D43 srgb(88,141,67)
6: ( 53, 40,121) #352879 srgb(53,40,121)
7: (184,199,111) #B8C76F srgb(184,199,111)
8: (111, 79, 37) #6F4F25 srgb(111,79,37)
9: ( 67, 57, 0) #433900 srgb(67,57,0)
10: (154,103, 89) #9A6759 srgb(154,103,89)
11: ( 68, 68, 68) #444444 srgb(68,68,68)
12: (108,108,108) #6C6C6C srgb(108,108,108)
13: (154,210,132) #9AD284 srgb(154,210,132)
14: (108, 94,181) #6C5EB5 srgb(108,94,181)
15: (149,149,149) #959595 srgb(149,149,149)
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: white
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 144x144+0+0
Dispose: Undefined
Iterations: 0
Compression: Zip
Orientation: Undefined
Properties:
date:create: 2015-04-10T20:46:55+02:00
date:modify: 2015-04-10T20:46:55+02:00
png:IHDR.bit-depth-orig: 4
png:IHDR.bit_depth: 4
png:IHDR.color-type-orig: 3
png:IHDR.color_type: 3 (Indexed)
png:IHDR.interlace_method: 0 (Not interlaced)
png:IHDR.width,height: 144, 144
png:pHYs: x_res=2835, y_res=2835, units=1
png:PLTE.number_colors: 16
png:sRGB: intent=0 (Perceptual Intent)
signature: 8a0ca53e6e6f8e8fc4b141c7194b399ed1fc32473b174b6240addbb3f98864e5
Artifacts:
filename: scacchiera.png
verbose: true
Tainted: False
Filesize: 241B
Number pixels: 20.7K
Pixels per second: 0B
User time: 0.000u
Elapsed time: 0:01.000
Version: ImageMagick 6.8.9-8 Q16 x86_64 2014-11-18
As you can see, both pics have same colors:
Colormap entries: 16
Colormap:
0: ( 0, 0, 0) #000000 black
1: (255,255,255) #FFFFFF white
2: (104, 55, 43) #68372B srgb(104,55,43)
3: (112,164,178) #70A4B2 srgb(112,164,178)
4: (111, 61,134) #6F3D86 srgb(111,61,134)
5: ( 88,141, 67) #588D43 srgb(88,141,67)
6: ( 53, 40,121) #352879 srgb(53,40,121)
7: (184,199,111) #B8C76F srgb(184,199,111)
8: (111, 79, 37) #6F4F25 srgb(111,79,37)
9: ( 67, 57, 0) #433900 srgb(67,57,0)
10: (154,103, 89) #9A6759 srgb(154,103,89)
11: ( 68, 68, 68) #444444 srgb(68,68,68)
12: (108,108,108) #6C6C6C srgb(108,108,108)
13: (154,210,132) #9AD284 srgb(154,210,132)
14: (108, 94,181) #6C5EB5 srgb(108,94,181)
15: (149,149,149) #959595 srgb(149,149,149)
If i join them with
convert -page 312x144+0+0 "scacchiera.png" -page +168+0 \
"level-000.png" -background black -layers flatten "joined.png"
then "joined.png" picture is:
It is identified as:
Image: joined.png
Format: PNG (Portable Network Graphics)
Mime type: image/png
Class: PseudoClass
Geometry: 312x144+0+0
Resolution: 28.35x28.35
Print size: 11.0053x5.07937
Units: PixelsPerCentimeter
Type: Palette
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Pixels: 44928
Red:
min: 0 (0)
max: 184 (0.721569)
mean: 81.9762 (0.321475)
standard deviation: 33.8163 (0.132613)
kurtosis: 0.917842
skewness: -0.743586
Green:
min: 0 (0)
max: 199 (0.780392)
mean: 63.1826 (0.247775)
standard deviation: 25.0478 (0.0982265)
kurtosis: 7.85041
skewness: 0.0804364
Blue:
min: 0 (0)
max: 111 (0.435294)
mean: 17.5233 (0.0687188)
standard deviation: 20.2675 (0.0794802)
kurtosis: 1.51309
skewness: 0.876441
Image statistics:
Overall:
min: 0 (0)
max: 199 (0.780392)
mean: 54.2274 (0.212656)
standard deviation: 26.9673 (0.105754)
kurtosis: 7.87712
skewness: 0.327418
Colors: 4
Histogram:
3846: ( 0, 0, 0) #000000 black
20564: ( 67, 57, 0) #433900 srgb(67,57,0)
20138: (111, 79, 37) #6F4F25 srgb(111,79,37)
380: (184,199,111) #B8C76F srgb(184,199,111)
Colormap entries: 4
Colormap:
0: ( 67, 57, 0) #433900 srgb(67,57,0)
1: (111, 79, 37) #6F4F25 srgb(111,79,37)
2: ( 0, 0, 0) #000000 black
3: (184,199,111) #B8C76F srgb(184,199,111)
Rendering intent: Perceptual
Gamma: 0.45455
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: black
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 312x144+0+0
Dispose: Undefined
Iterations: 0
Compression: Zip
Orientation: Undefined
Properties:
date:create: 2015-04-12T15:13:11+02:00
date:modify: 2015-04-12T15:13:11+02:00
png:bKGD: chunk was found (see Background color, above)
png:cHRM: chunk was found (see Chromaticity, above)
png:gAMA: gamma=0.45454544 (See Gamma, above)
png:IHDR.bit-depth-orig: 2
png:IHDR.bit_depth: 2
png:IHDR.color-type-orig: 3
png:IHDR.color_type: 3 (Indexed)
png:IHDR.interlace_method: 0 (Not interlaced)
png:IHDR.width,height: 312, 144
png:pHYs: x_res=2835, y_res=2835, units=1
png:PLTE.number_colors: 4
png:sRGB: intent=0 (Perceptual Intent)
png:text: 2 tEXt/zTXt/iTXt chunks were found
signature: 2049a10c0a2a73f864125d0ba93ccfc604a750667e3ba1d0fe8fe3be38a1cbea
Artifacts:
filename: joined.png
verbose: true
Tainted: False
Filesize: 487B
Number pixels: 44.9K
Pixels per second: 4.493MB
User time: 0.000u
Elapsed time: 0:01.009
Version: ImageMagick 6.8.9-8 Q16 x86_64 2014-11-18
and you can see that palette is totally different from the initial one.
Images are here:
The question is: is there a way to have ALWAYS this palette:
Colormap entries: 16
Colormap:
0: ( 0, 0, 0) #000000 black
1: (255,255,255) #FFFFFF white
2: (104, 55, 43) #68372B srgb(104,55,43)
3: (112,164,178) #70A4B2 srgb(112,164,178)
4: (111, 61,134) #6F3D86 srgb(111,61,134)
5: ( 88,141, 67) #588D43 srgb(88,141,67)
6: ( 53, 40,121) #352879 srgb(53,40,121)
7: (184,199,111) #B8C76F srgb(184,199,111)
8: (111, 79, 37) #6F4F25 srgb(111,79,37)
9: ( 67, 57, 0) #433900 srgb(67,57,0)
10: (154,103, 89) #9A6759 srgb(154,103,89)
11: ( 68, 68, 68) #444444 srgb(68,68,68)
12: (108,108,108) #6C6C6C srgb(108,108,108)
13: (154,210,132) #9AD284 srgb(154,210,132)
14: (108, 94,181) #6C5EB5 srgb(108,94,181)
15: (149,149,149) #959595 srgb(149,149,149)
exactly with these 16 colors and in this order for each resluting PNG?
831
I have tried some more and I can't see a way to do this with ImageMagick. You can extract the unique colours from scacchiera.png like this:
convert scacchiera.png -unique-colors -scale 1000 swatch.png
but there are only 2 colours in there, so that is no use:
You can also extract the colormap and make a CLUT like this:
convert xc:"#000000" xc:"#FFFFFF" xc:"#68372B" xc:"#70A4B2" \
xc:"#6F3D86" xc:"#588D43" xc:"#352879" xc:"#B8C76F" \
xc:"#6F4F25" xc:"#433900" xc:"#9A6759" xc:"#444444" \
xc:"#6C6C6C" xc:"#9AD284" xc:"#6C5EB5" xc:"#959595" +append -scale 500 clut.png
which gives you this
You can then use that CLUT like this, but it doesn't help
convert -page 312x144+0+0 "scacchiera.png" -page +168+0 \
"level-000.png" -background black -layers flatten \
-remap clut.png "joined.png"
and you can also use it like this but that doesn't work either
convert -page 312x144+0+0 "scacchiera.png" -page +168+0 \
"level-000.png" -background black -layers flatten \
clut.png -clut "joined.png"
You can also try to tell ImageMagick to preserve the colormap like this, but I'll leave you to guess whether that works :-(
convert -define png:preserve-colormap scacchiera.png ...
convert -define png:preserve-colormap=1 scacchiera.png png00:out.png
convert -define png:preserve-colormap=true scacchiera.png png00:out.png
So, I am stuck too :-)
Original Answer
You don't say how you want to join your images, nor provide any images, nor show what you have tried, so you may not get a good answer. This may be close though...
convert 1.png 2.png -append -remap 1.png result.png
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