[magick-users] Fwd: Rotating TIFF results on negated image

[Ross Presser]

My guess, from lurking on the TIFF mailing list:  ImageMagick is
misinterpreting the "photometric intent" of your TIFF image. Somewhere
in your original TIFF is an instruction that states that zero is black
(or white), and ImageMagick is ignoring it and assuming that zero is
white (or black).

On 5/8/07, Josue Gomes <josue.gomes.honeypot at gmail.com> wrote:
> Hi,
>
> I've a two-image TIFF file which I want to rotate 90 degrees.
> ImageMagick rotates it fine but also negates the image.
>
> I'm using the following command line:
>
> > convert -rotate 90 killer2-tiffg3.tif k2.tif
>
> As workaround I'm using -negate but I don't think it's the correct way to do
> it.
>
> Version below:
>
> Version: ImageMagick 6.3.3 04/20/07 Q16 http://www.imagemagick.org
> Copyright: Copyright (C) 1999-2007 ImageMagick Studio LLC
>
> Identify -verbose:
>
> Image: killer2-tiffg3.tif
>  Format: TIFF (Tagged Image File Format)
>  Class: DirectClass
>  Geometry: 1728x2292+0+0
>  Type: Bilevel
>  Endianess: MSB
>  Colorspace: Gray
>  Channel depth:
>    Gray: 1-bit
>  Channel statistics:
>    Gray:
>      Min: 0 (0)
>      Max: 1 (1)
>      Mean: 0.889109 (0.889109)
>      Standard deviation: 0.313997 (0.313997)
>  Colors: 2
>  Histogram:
>    439193: #000000 black
>   3521383: #FFFFFF white
>  Rendering intent: Undefined
>  Resolution: 204x196
>  Units: PixelsPerInch
>  Filesize: 215.916kb
>  Interlace: None
>  Background color: white
>  Border color: rgb(223,223,223)
>  Matte color: grey74
>  Transparent color: black
>  Page geometry: 1728x2292+0+0
>  Dispose: Undefined
>  Iterations: 0
>  Scene: 0 of 2
>  Compression: Fax
>  Orientation: TopLeft
>  Signature: c7cf4b2f4947a144e41b6b27703c57222507864d5ff00605c73c17622bdc0ad8
>  Software: GPL Ghostscript 8.56
>  Timestamp: 2007:05:04 14:18:38
>  Tainted: False
>  User time: 0.109u
>  Elapsed time: 0:01
>  Pixels per second: 34.3377mb
>  Version: ImageMagick 6.3.3 04/20/07 Q16 http://www.imagemagick.org
> Image: killer2-tiffg3.tif
>  Format: TIFF (Tagged Image File Format)
>  Class: DirectClass
>  Geometry: 1728x2292+0+0
>  Type: Bilevel
>  Endianess: MSB
>  Colorspace: Gray
>  Channel depth:
>    Gray: 1-bit
>  Channel statistics:
>    Gray:
>      Min: 0 (0)
>      Max: 1 (1)
>      Mean: 0.937133 (0.937133)
>      Standard deviation: 0.242723 (0.242723)
>  Colors: 2
>  Histogram:
>    248988: #000000 black
>   3711588: #FFFFFF white
>  Rendering intent: Undefined
>  Resolution: 204x196
>  Units: PixelsPerInch
>  Filesize: 215.916kb
>  Interlace: None
>  Background color: white
>  Border color: rgb(223,223,223)
>  Matte color: grey74
>  Transparent color: black
>  Page geometry: 1728x2292+0+0
>  Dispose: Undefined
>  Iterations: 0
>  Scene: 1 of 2
>  Compression: Fax
>  Orientation: TopLeft
>  Signature: 0941287e969de4651fb0dd799d89252dd23ae5468196a6d8776582cb0486b1f9
>  Software: GPL Ghostscript 8.56
>  Timestamp: 2007:05:04 14:18:39
>  Tainted: False
>  User time: 3.484u
>  Elapsed time: 0:04
>  Pixels per second: 1.07917mb
>  Version: ImageMagick 6.3.3 04/20/07 Q16 http://www.imagemagick.org
>
>
> Any idea?
>
> regards,
> josue
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