不知道做什么的 - 但我们说,我们这个PDF文件的工作:https://stlab.adobe.com/wiki/index.php/File:Test.pdf,我想使用的Ghostscript的tiffsep
设备获得的分离:Ghostscript tiffsep创建在ImageMagick显示中反转的CMYK图像?
cd /tmp
wget https://stlab.adobe.com/wiki/images/d/d3/Test.pdf
ghostscript -q -sDEVICE=tiffsep -dNOPAUSE -dBATCH -dSAFER -r72x72 -sOutputFile=testseps.tif -dFirstPage=1 -dLastPage=1 Test.pdf
eog testseps.tif & display testseps.tif
这会生成五个文件:testseps(Black).tif
,testseps(Cyan).tif
,testseps(Magenta).tif
,testseps.tif
,testseps(Yellow).tif
。我在侏儒之眼(eog
)和ImageMagick的display
中打开全彩色输出(testseps.tif
),这就是我所得到的(Ubuntu 14.04,MATE桌面,ghostscript 9.10,ImageMagick 6.7.7-10 2017-03-14 Q16):
也就是说,ImageMagick的display
(左)显示了反色这个文件,而侏儒(右)的眼睛正确地显示了同样的文件?
那么我怎样才能让这个CMYK tiff在display
和侏儒之眼中都能正确显示?我能以某种方式将它与ImageMagick的convert
转换,命令行是什么?我已经尝试过这样的:
convert testseps.tif -colorspace CMYK -alpha off -define quantum:polarity=min-is-white -colorspace CMYK testseps2.tif
...并且该文件再次显示相同的问题。
编辑:另外,如果我尝试使用convert
个别分离结合:
convert \
testseps\(Cyan\).tif \
testseps\(Magenta\).tif \
testseps\(Yellow\).tif \
testseps\(Black\).tif \
-set colorspace CMYK \
-profile /usr/share/ghostscript/9.10/iccprofiles/default_cmyk.icc
-combine
combined.tif
...然后combined.tif
正常显示ImageMagick的display
- 但显示为侏儒的眼睛完全黑了!如果我-combine
后添加-negate
开关,然后我回到以前的状态(display
表演倒立,eog
显示正确的)
EDIT2:试图用服务http://www.rgb2cmyk.org/,获得张贴的RGB屏幕截图的CMYK TIF在这里,那一个也显示了同样的错误:它在display
中被反转,并在侏儒之眼中正确显示。
仅供参考,这里是一个关于testseps.tif
位信息的:
$ tiffinfo testseps.tif
TIFF Directory at offset 0x8 (8)
Subfile Type: multi-page document (2 = 0x2)
Image Width: 612 Image Length: 792
Resolution: 72, 72 pixels/inch
Bits/Sample: 8
Compression Scheme: LZW
Photometric Interpretation: separated
FillOrder: msb-to-lsb
Orientation: row 0 top, col 0 lhs
Samples/Pixel: 4
Rows/Strip: 428
Planar Configuration: single image plane
Page Number: 0-0
Software: GPL Ghostscript 9.10
DateTime: 2017:04:10 12:53:45
ICC Profile: <present>, 56412 bytes
$ identify -verbose testseps.tif
Image: testseps.tif
Format: TIFF (Tagged Image File Format)
Class: DirectClass
Geometry: 612x792+0+0
Resolution: 72x72
Print size: 8.5x11
Units: PixelsPerInch
Type: ColorSeparation
Endianess: MSB
Colorspace: CMYK
Depth: 8-bit
Channel depth:
cyan: 8-bit
magenta: 8-bit
yellow: 8-bit
black: 8-bit
Channel statistics:
Cyan:
min: 0 (0)
max: 235 (0.921569)
mean: 5.93515 (0.0232751)
standard deviation: 33.3466 (0.130771)
kurtosis: 28.8423
skewness: 5.53334
Magenta:
min: 0 (0)
max: 245 (0.960784)
mean: 2.7823 (0.010911)
standard deviation: 18.73 (0.0734511)
kurtosis: 68.8725
skewness: 8.12072
Yellow:
min: 0 (0)
max: 255 (1)
mean: 5.04176 (0.0197716)
standard deviation: 30.8529 (0.120992)
kurtosis: 34.9211
skewness: 6.05297
Black:
min: 0 (0)
max: 226 (0.886275)
mean: 1.06569 (0.00417917)
standard deviation: 13.7509 (0.0539252)
kurtosis: 227.454
skewness: 15.0002
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 3.70622 (0.0145342)
standard deviation: 25.5137 (0.100054)
kurtosis: 51.8946
skewness: 7.28691
Total ink density: 298%
Rendering intent: Undefined
Gamma: 1
Interlace: None
Background color: cmyk(255,255,255,0)
Border color: cmyk(223,223,223,0)
Matte color: cmyk(189,189,189,0)
Transparent color: cmyk(0,0,0,0)
Compose: Over
Page geometry: 612x792+0+0
Dispose: Undefined
Iterations: 0
Compression: LZW
Orientation: TopLeft
Properties:
date:create: 2017-04-10T12:53:45+02:00
date:modify: 2017-04-10T12:53:45+02:00
signature: 1ad1532f697fa72492fe994d79f1b67d617a34cd927f31b41e6a12214b9bc49e
tiff:endian: lsb
tiff:photometric: separated
tiff:rows-per-strip: 428
tiff:software: GPL Ghostscript 9.10
tiff:timestamp: 2017:04:10 12:53:45
Profiles:
Profile-icc: 187484 bytes
Description: Artifex CMYK SWOP Profile
Manufacturer: Artifex CMYK SWOP Profile
Model: Artifex CMYK SWOP Profile
Copyright: Copyright Artifex Software 2011
Artifacts:
filename: testseps.tif
verbose: true
Tainted: True
Filesize: 220KB
Number pixels: 485K
Pixels per second: 24.24MB
User time: 0.020u
Elapsed time: 0:01.019
Version: ImageMagick 6.7.7-10 2017-03-14 Q16 http://www.imagemagick.org
也转贴于https://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=31746 – sdaau