Re: Regression regarding 16-bit grayscale DPX files

[email protected] wrote:
>> but "identify" thinks the image is in Log colorspace, not Grayscale
>>     
>
> You will need to remind us what the problem is and post a URL to an image
> we can download to reproduce the problem.
>   
OK.  A description of the problem follows.  I have a sample image (a 4k
grayscale image containing a large letter "Y"), but I don't have a site
to download it from.  Is there a site that I can upload it to?

Here's the problem, from my prior e-mail.  The display problem has was
corrected as a result of my original e-mail, but identify -verbose still
gives the incorrect colospace (note that the info below is from a
different DPX file, but generated the same way.  It's proprietary, so I
can't send it).

>From my prior e-mail:

Somewhere between version 6.2.9-1 and the current version (6.3.4-9), a
regression seems to have occurred regarding 16-bit grayscale DPX files. 
I'd reported the problem back in August of 2006 (see
http://www.imagemagick.org/pipermail/magick-bugs/2006-August/002488.html
) and the problem was fixed shortly thereafter 
(http://www.imagemagick.org/pipermail/magick-bugs/2006-August/002489.html
).  We've been using the 6.2.9-1 release for about 6 months and wanted
to upgrade, but this regression is stopping us.

Is there any chance that this can be investigated and re-addressed?

Thanks,

Alan

P.S.  Here's identify -verbose info from both versions:

6.2.9-1 (displays correctly):

    Image: 128543.dpx
      Format: DPX (SMPTE 268M-2003 (DPX))
      Class: DirectClass
      Geometry: 4096x3112
      Type: Grayscale
      Endianess: MSB
      Colorspace: Gray
      Channel depth:
        Gray: 16-bit
      Channel statistics:
        Gray:
          Min: 0 (0)
          Max: 65535 (1)
          Mean: 36366.1 (0.554911)
          Standard deviation: 22168.1 (0.338264)
      Colors: 1024
      Rendering intent: Undefined
      Resolution: 72x72
      Units: Undefined
      Filesize: 16.2734mb
      Interlace: None
      Background color: white
      Border color: #DFDFDFDFDFDF
      Matte color: grey74
      Transparent color: black
      Page geometry: 4096x3112+0+0
      Dispose: Undefined
      Iterations: 0
      Compression: Undefined
      Orientation: TopLeft
      Comment: Project name
      Copyright: Copyright info
      Document: Image filename
      Dpx:file.copyright: Copyright info
      Dpx:file.creator: Creator
      Dpx:file.ditto.key: 1
      Dpx:file.filename: Image filename
      Dpx:file.project: Project name
      Dpx:file.tilestamp: 2006:12:21:03:03:02
      Dpx:file.version: V1.0
      Dpx:film.format: 004F
      Dpx:image.orientation: 0
      Dpx:orientation.device: SPIRIT-4K DATACINE
      Dpx:orientation.serial: 00105
      Dpx:television.time.code: 01:29:15:23
      Dpx:user.id: Thomson BTS
      Signature:
    aeb967966311e95a97d215006bc5e2e26d95361c81ffba74aa94d8d181853577
      Software: Creator
      Tainted: False
      Version: ImageMagick 6.2.9 08/31/06 Q16 http://www.imagemagick.org

6.3.4-0 (displays incorrectly):

    Image: 128543.dpx
      Format: DPX (SMPTE 268M-2003 (DPX 2.0))
      Class: DirectClass
      Geometry: 4096x3112+0+0
      Type: TrueColor
      Endianess: MSB
      Colorspace: Log
      Channel depth:
        Red: 16-bit
        Green: 16-bit
        Blue: 16-bit
      Channel statistics:
        Red:
          Min: 0 (0)
          Max: 65535 (1)
          Mean: 25150.8 (0.383776)
          Standard deviation: 19849.9 (0.30289)
        Green:
          Min: 0 (0)
          Max: 65535 (1)
          Mean: 25150.8 (0.383776)
          Standard deviation: 19849.9 (0.30289)
        Blue:
          Min: 0 (0)
          Max: 65535 (1)
          Mean: 25150.8 (0.383776)
          Standard deviation: 19849.9 (0.30289)
      Colors: 1024
      Histogram:
         23073: (  320,  320,  320) #014001400140
    rgb(0.488289%,0.488289%,0.488289%)
        107498: (    0,    0,    0) #000000000000 black
         13069: (  384,  384,  384) #018001800180
    rgb(0.585946%,0.585946%,0.585946%)
         66561: (  256,  256,  256) #010001000100
    rgb(0.390631%,0.390631%,0.390631%)
        569031: (  192,  192,  192) #00C000C000C0
    rgb(0.292973%,0.292973%,0.292973%)
        921383: (  128,  128,  128) #008000800080
    rgb(0.195315%,0.195315%,0.195315%)
         74865: (   64,   64,   64) #004000400040
    rgb(0.0976577%,0.0976577%,0.0976577%)
         .
         .   (lots of additional histogram values omitted for brevity)
         .
     Rendering intent: Undefined
      Resolution: 72x72
      Units: Undefined
      Filesize: 16.2734mb
      Interlace: None
      Background color: white
      Border color: rgb(223,223,223)
      Matte color: grey74
      Transparent color: black
      Page geometry: 4096x3112+0+0
      Dispose: Undefined
      Iterations: 0
      Compression: Undefined
      Orientation: TopLeft
      Comment: Project name
      Copyright: Copyright info
      Document: Image filename
      Dpx:file.copyright: Copyright info
      Dpx:file.creator: Creator
      Dpx:file.ditto.key: 1
      Dpx:file.filename: Image filename
      Dpx:file.frame_position: 128543
      Dpx:file.held_count: 1
      Dpx:file.project: Project name
      Dpx:file.timestamp: 2006:12:21:03:03:02
      Dpx:file.version: V1.0
      Dpx:film.format: 004F
      Dpx:film.shutter_angle: nan
      Dpx:image.orientation: 0
      Dpx:orientation.device: SPIRIT-4K DATACINE
      Dpx:orientation.serial: 00105
      Dpx:orientation.x_center: nan
      Dpx:orientation.y_center: nan
      Dpx:television.black_gain: nan
      Dpx:television.black_level: nan
      Dpx:television.break_point: nan
      Dpx:television.field_number: 255
      Dpx:television.frame_rate: nan
      Dpx:television.gamma: nan
      Dpx:television.horizontal_sample_rate: nan
      Dpx:television.integration_times: nan
      Dpx:television.interlace: 255
      Dpx:television.padding: 255
      Dpx:television.time.code: 01:29:15:23
      Dpx:television.time_offset: nan
      Dpx:television.user.bits: 00:00:00:00
      Dpx:television.vertical_sample_rate: nan
      Dpx:television.video_signal: 255
      Dpx:television.white_level: nan
      Dpx:user.id: Thomson BTS
      Signature:
    f04e7f06ba00562c2c94df833ed6c83e358f367b6c0c09658c2d58a0772320e0
      Software: Creator
      Profile-dpx:user.data: 63108 bytes
      Tainted: False
      User time: 0.760u
      Elapsed time: 0:02
      Pixels per second: 12.1562mb
      Version: ImageMagick 6.3.4 06/14/07 Q16 http://www.imagemagick.org