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我需要加入 2 张 PNG 图像,带有 16 个调色板,保持颜色编号和顺序为原件。
两种 PNG 都使用相同的 16 色调色板。
有没有一种方法可以创建具有所有颜色的 4 位索引 PNG,甚至在每个 PNG 中都没有使用?
编辑更清楚:
我有2张照片。
第一个是“level-000.png”:
它被识别为:
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
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
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)
convert -page 312x144+0+0 "scacchiera.png" -page +168+0 \
"level-000.png" -background black -layers flatten "joined.png"
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
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)
最佳答案
我已经做了更多的工作,并且相信我可以实现你想要的......基本上,我允许 ImageMagick 完全按照你的方式对图像进行重新分页和连接,但随后我让 ImageMagick 输出一个 NetPBM 文件可移植任意 map PNM
格式。然后我对 PNM
进行编码使用我编写的 Perl 编码器将文件格式化为 PNG,以满足您对调色板的非常具体的需求。因此,对于我从 PNM
读入的每个真彩色 24 位 RGB 像素文件,我通过计算平方误差的总和来计算它最接近哪个调色板条目,然后输出单个调色板索引。NetPBM
描述 here .PNM
格式非常易于解析,这就是我选择它的原因。说明here .
因此,您的原始命令几乎相同,除了 PNM
文件在 stdout
上输出并读入 Perl 脚本 pnmtopng
然后使 PNG
你想要的文件:
convert -page 312x144+0+0 scacchiera.png -page +168+0 \
level-000.png -background black -layers flatten pnm:- | ./pnmtopng > out.png
#!/usr/bin/perl
use strict;
use warnings;
use Digest::CRC qw(crc32);
use IO::Compress::Deflate qw(deflate $DeflateError) ;
# Our beloved fixed palette
my @palette=(
[0,0,0],
[255,255,255],
[104,55,43],
[112,164,178],
[111,61,134],
[88,141,67],
[53,40,121],
[184,199,111],
[111,79,37],
[67,57,0],
[154,103,89],
[68,68,68],
[108,108,108],
[154,210,132],
[108,94,181],
[149,149,149]
);
################################################################################
# Take chunk of PNG data as parameter, calculate its length & CRC, and output it
################################################################################
sub PNGoutputChunk()
{
my $len=length($_[0])-4;
my $crc = Digest::CRC->new(type=>"crc32");
$crc->add($_[0]);
print pack('N',$len),$_[0],pack('N',$crc->digest);
}
################################################################################
# Main
################################################################################
# Read P6 PNM file from STDIN
my $line = <STDIN>;
chomp($line);
if ($line ne "P6"){die "Expected P6 format PNM file"}
# Read width and height from STDIN
$line = <STDIN>;
my ($width,$height) = ($line =~ /(\d+)\s+(\d+)/);
print STDERR "DEBUG: width=$width, height=$height\n";
# Read MAX PNM value and ignore
$line = <STDIN>;
# Read entire remainder of PNM file
my $expectedsize=$width * $height * 3;
my $PNMdata;
my $bytesRead = read(STDIN,$PNMdata,$expectedsize);
if($bytesRead != $expectedsize){die "Unable to read PNM data"}
# Output PNG header chunk
printf "\x89PNG\x0d\x0a\x1a\x0a";
my $bitdepth=8;
my $colortype=3;
my $compressiontype=0;
my $filtertype=0;
my $interlacetype=0;
# Output PNG IHDR chunk
my $IHDR='IHDR';
$IHDR .= pack 'N',$width;
$IHDR .= pack 'N',$height;
$IHDR .= pack 'c',$bitdepth;
$IHDR .= pack 'c',$colortype;
$IHDR .= pack 'c',$compressiontype;
$IHDR .= pack 'c',$filtertype;
$IHDR .= pack 'c',$interlacetype;
&PNGoutputChunk($IHDR);
# Output PNG PLTE (palette)
my $PLTE='PLTE';
for(my $i=0;$i<scalar @palette;$i++){
$PLTE .= sprintf('%c',$palette[$i][0]); # Red
$PLTE .= sprintf('%c',$palette[$i][1]); # Green
$PLTE .= sprintf('%c',$palette[$i][2]); # Blue
}
&PNGoutputChunk($PLTE);
# Output PNG IDAT chunk
# RFC-1950 zlib compression
my $raw;
# Go through PNM data, and for each RGB pixel, find nearest palette entry
my @PNMvalues = unpack("C*",$PNMdata);
print STDERR "Unpacked ",scalar @PNMvalues," from raw\n";
for(my $pixel=0;$pixel<(scalar @PNMvalues)/3;$pixel++){
# Output filter type byte (0) at start of each scanline
if($pixel%$width==0){$raw .= "\x00";}
my $r=$PNMvalues[(3*$pixel)]; # Red PNM value
my $g=$PNMvalues[(3*$pixel)+1]; # Green PNM value
my $b=$PNMvalues[(3*$pixel)+2]; # Blue PNM value
my $nearest=0;
my $distmin=(255*255)+(255*255)+(255*255); # Couldn't get further
# Go through all palette entries to find nearest to this RGB
for(my $pe=0;$pe<scalar @palette;$pe++){
my $pr=$palette[$pe][0]; # Red palette value
my $pg=$palette[$pe][1]; # Green palette value
my $pb=$palette[$pe][2]; # Blue palette value
my $dist = ($pr-$r)*($pr-$r) + ($pg-$g)*($pg-$g) + ($pb-$b)*($pb-$b);
if($dist<$distmin){
$distmin=$dist;
$nearest=$pe;
}
}
$raw .= sprintf "%c",$nearest;
print STDERR "Pixel: $pixel, r=$r, g=$g, b=$b. Chose palette entry $nearest\n";
}
print STDERR "Length of raw: ",length($raw);
my $deflated;
my $status = deflate \$raw => \$deflated
or die "deflate failed: $DeflateError\n";
my $IDAT="IDAT" . $deflated;
&PNGoutputChunk($IDAT);
# Output PNG IEND chunk
&PNGoutputChunk('IEND');
关于ImageMagick 在加入 2 个 PNG 时保留自定义调色板,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29587679/
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我正在尝试在主页上使用 ajax 在 magento 中使用 ajax 显示流行的产品列表,我可以为 5 或“N”个产品执行此操作,但我想要的是将分页工具栏与结果集一起添加. 这是我添加的以显示流行产
我正在尝试使用 PasswordResetForm 内置函数。 由于我想要自定义表单字段,因此我编写了自己的表单: class FpasswordForm(PasswordResetForm):
据我了解,新的 Angular 7 提供了拖放功能。我搜索了有关 DnD 的 Tree 组件,但没有找到与树相关的内容。 我在 Stackblitz 上找到的一个工作示例.对比drag'ndrop功能
我必须开发一个自定义选项卡控件并决定使用 WPF/XAML 创建它,因为我无论如何都打算学习它。完成后应该是这样的: 到目前为止,我取得了很好的进展,但还有两个问题: 只有第一个/最后一个标签项应该有
我要定制xtable用于导出到 LaTeX。我知道有些问题是关于 xtable在这里,但我找不到我要找的具体东西。 以下是我的表的外观示例: my.table <- data.frame(Specif
用ejs在这里显示日期 它给我结果 Tue Feb 02 2016 16:02:24 GMT+0530 (IST) 但是我需要表现为 19th January, 2016 如何在ejs中执行此操作?
我想问在 JavaFX 中使用自定义对象制作 ListView 的最佳方法,我想要一个每个项目如下所示的列表: 我搜了一下,发现大部分人都是用细胞工厂的方法来做的。有没有其他办法?例如使用客户 fxm
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