Remove Chromaticity info in PDF->TIFF

[fmw42]

What minor version of 6.9.0.x? You said 6.9.0.10 and that showed me the chromaticity. So I will need to check back further.

Code: Select all

convert -version

what does that return?

[sbleon]

6.9.0-10 is the version. We're using the same version, but I was pointing out that you were checking for Chromaticity on the original PDF, whereas I am interested in whether Chromaticity is included on the TIF generated from the PDF. It doesn't matter to me whether the PDF has the Chromaticity or not.

[fmw42]

OK I can verify for 6.9.0.10. Note that the PDF you provided is not the same as in your command line example.

Code: Select all

im69010 convert -density 500 -units PixelsPerInch ABSYX.pdf[0] \
-background white -alpha remove -resize 4125x5338 -monochrome -compress Group4 ABSYX.tif

Code: Select all

im69010 identify -verbose ABSYX.tif
Image: ABSYX.tif
  Format: TIFF (Tagged Image File Format)
  Mime type: image/tiff
  Class: DirectClass
  Geometry: 4125x5338+0+0
  Resolution: 500x500
  Print size: 8.25x10.676
  Units: PixelsPerInch
  Type: Bilevel
  Base type: Bilevel
  Endianess: LSB
  Colorspace: Gray
  Depth: 1-bit
  Channel depth:
    gray: 1-bit
  Channel statistics:
    Pixels: 22019250
    Gray:
      min: 0 (0)
      max: 1 (1)
      mean: 0.907487 (0.907487)
      standard deviation: 0.289748 (0.289748)
      kurtosis: 5.91129
      skewness: -2.8127
      entropy: 0.616585
  Colors: 2
  Histogram:
   2037057: (  0,  0,  0) #000000 gray(0)
  19982193: (255,255,255) #FFFFFF gray(255)
  Rendering intent: Undefined
  Gamma: 0.454545
  Background color: gray(255)
  Border color: gray(223)
  Matte color: gray(189)
  Transparent color: gray(0)
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 4125x5338+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Group4
  Orientation: TopLeft
  Properties:
    date:create: 2016-01-15T15:46:03-08:00
    date:modify: 2016-01-15T15:46:03-08:00
    signature: 7a530e231b3b68f8152baf03864c28058a7e777e89c0080e49606aa41c05c80b
    tiff:alpha: unspecified
    tiff:endian: lsb
    tiff:photometric: min-is-white
    tiff:rows-per-strip: 5338
  Artifacts:
    filename: ABSYX.tif
    verbose: true
  Tainted: False
  Filesize: 153KB
  Number pixels: 22.02M
  Pixels per second: 244.66GB
  User time: 0.000u
  Elapsed time: 0:01.000
  Version: ImageMagick 6.9.0-10 Q16 x86_64 2016-01-14 http://www.imagemagick.org

I will check some other versions, now.

[fmw42]

.
The change occurs between 6.9.1.1 and 6.9.1.2. I used a simpler command just to test. So you should report this to the Developers forum and see if there is any optional switch (-define perhaps), they can put in the current IM to allow you to turn this off.

Is this an issue simply with what Identify shows or with what is in the TIFF metadata?

Code: Select all

im6911 convert ABSYX.pdf[0] -alpha remove -monochrome -compress Group4 ABSYX.tif
im6911 identify -verbose ABSYX.tif
Image: ABSYX.tif
  Format: TIFF (Tagged Image File Format)
  Mime type: image/tiff
  Class: DirectClass
  Geometry: 612x792+0+0
  Resolution: 72x72
  Print size: 8.5x11
  Units: Undefined
  Type: Bilevel
  Base type: Bilevel
  Endianess: LSB
  Colorspace: Gray
  Depth: 1-bit
  Channel depth:
    gray: 1-bit
  Channel statistics:
    Pixels: 484704
    Gray:
      min: 0 (0)
      max: 1 (1)
      mean: 0.908334 (0.908334)
      standard deviation: 0.288554 (0.288554)
      kurtosis: 6.01006
      skewness: -2.8302
      entropy: 0.442007
  Colors: 2
  Histogram:
     44431: (  0,  0,  0) #000000 gray(0)
    440273: (255,255,255) #FFFFFF gray(255)
  Rendering intent: Undefined
  Gamma: 0.454545
  Background color: gray(255)
  Border color: gray(223)
  Matte color: gray(189)
  Transparent color: gray(0)
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 612x792+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Group4
  Orientation: TopLeft
  Properties:
    date:create: 2016-01-15T16:25:12-08:00
    date:modify: 2016-01-15T16:25:12-08:00
    signature: 29e91cfc38e09c75525f2d373608badfa74b565d59b945025e7bc54c705bbae2
    tiff:alpha: unspecified
    tiff:endian: lsb
    tiff:photometric: min-is-white
    tiff:rows-per-strip: 792
  Artifacts:
    filename: ABSYX.tif
    verbose: true
  Tainted: False
  Filesize: 21.5KB
  Number pixels: 485K
  Pixels per second: 242.35GB
  User time: 0.000u
  Elapsed time: 0:01.000
  Version: ImageMagick 6.9.1-1 Q16 x86_64 2016-01-15 http://www.imagemagick.org

Code: Select all

im6912 convert ABSYX.pdf[0] -alpha remove -monochrome -compress Group4 ABSYX.tif
im6912 identify -verbose ABSYX.tif
Image: ABSYX.tif
  Format: TIFF (Tagged Image File Format)
  Mime type: image/tiff
  Class: DirectClass
  Geometry: 612x792+0+0
  Resolution: 72x72
  Print size: 8.5x11
  Units: Undefined
  Type: Bilevel
  Base type: Bilevel
  Endianess: LSB
  Colorspace: Gray
  Depth: 1-bit
  Channel depth:
    gray: 1-bit
  Channel statistics:
    Pixels: 484704
    Gray:
      min: 0 (0)
      max: 1 (1)
      mean: 0.908334 (0.908334)
      standard deviation: 0.288554 (0.288554)
      kurtosis: 6.01006
      skewness: -2.8302
      entropy: 0.442007
  Colors: 2
  Histogram:
     44431: (  0,  0,  0) #000000 gray(0)
    440273: (255,255,255) #FFFFFF gray(255)
  Rendering intent: Undefined
  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: gray(255)
  Border color: gray(223)
  Matte color: gray(189)
  Transparent color: gray(0)
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 612x792+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Group4
  Orientation: TopLeft
  Properties:
    date:create: 2016-01-15T16:25:00-08:00
    date:modify: 2016-01-15T16:25:00-08:00
    signature: 29e91cfc38e09c75525f2d373608badfa74b565d59b945025e7bc54c705bbae2
    tiff:alpha: unspecified
    tiff:endian: lsb
    tiff:photometric: min-is-white
    tiff:rows-per-strip: 792
  Artifacts:
    filename: ABSYX.tif
    verbose: true
  Tainted: False
  Filesize: 21.6KB
  Number pixels: 485K
  Pixels per second: 242.35GB
  User time: 0.000u
  Elapsed time: 0:01.000
  Version: ImageMagick 6.9.1-2 Q16 x86_64 2016-01-15 http://www.imagemagick.org

[sbleon]

Thanks again, Fred! This is some of the best OSS community support I've ever experienced

I posted in Developers here: viewtopic.php?f=2&t=29009. We should probably continue the discussion there to avoid forking it. But I wanted to answer your question:

The presence of the Chromaticity section in `identify`'s output correlates with the TIFF file being unusable in my workflow. I believe that `identify` is revealing something from the file metadata that is different between 6.9.1.1 and 6.9.1.2, but I can't say that with 100% certainty.

[fmw42]

Out of curiosity, what tool does not read the TIFF files with chromaticity? Have you corresponded with the creator of that tool about the issue?

[sbleon]

It's a (very) old version of Exstream Dialogue. It's proprietary software, and I'm sure our version of it is far past EOL. I'm trying to figure out if we can modernize/replace it, but that process is going to take a while.

[fmw42]

It's a (very) old version of Exstream Dialogue. It's proprietary software, and I'm sure our version of it is far past EOL. I'm trying to figure out if we can modernize/replace it, but that process is going to take a while.

Thanks.

[sbleon]

Good news! I was finally able to convert a PDF to a usable TIFF using a current version of ImageMagick (6.9.3-0)! Here is the updated command:

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convert -density 500 -units PixelsPerInch ACBYX.pdf[0] -background white -alpha remove -define white-point=0x0 -resize 4125x5338 -monochrome -compress Group4 ACBYX.tif

The “-define white-point=0x0” setting is new, and it appears to prevent the troublesome Chromaticity data from being written to the TIFF file.