[mgp-users 1508] Re: Problem with mgp2ps -c

[Yoshifumi Nishida <nishida@sfc.wide.ad.jp>]

Hello Kevin,

If it's ok for you, please send me the image file that cause the issue.

Thanks,
--
Yoshifumi Nishida
nishida@sfc.wide.ad.jp

From: Kevin.Buckley@ecs.vuw.ac.nz
Subject: Re: [mgp-users 1505] Problem with mgp2ps -c
Date: Sun, 6 Jun 2010 15:47:04 +1200
Message-ID: <>

 > > Another problem seems to be the implementation of newimage under mgp2ps.
 > > First, simple black and white graphics don't appear (I suspect that this
 > > is the same problem as above).
 > 
 > Just to say that I have recently seen a problem with newimage in
 > mgp itself, when loading a 16-bit image.
 > 
 > Using ImageMagick's identify on the PNG that fails and one that doesn't
 > 
 > $ identify kepler-uifilt-002d-75.png
 > kepler-uifilt-002d-75.png PNG 536x133 536x133+0+0 DirectClass 16-bit
 > 69.6543kb
 > 
 > 
 > $ identify kepler-003-85-montage.png
 > kepler-003-85-montage.png PNG 799x417 799x417+0+0 DirectClass 16-bit
 > 130.646kb
 > 
 > tells me little, however, when I add the verbose flag
 > 
 > Image: kepler-uifilt-002d-75.png
 >   Format: PNG (Portable Network Graphics)
 >   Class: DirectClass
 >   Geometry: 536x133+0+0
 >   Type: TrueColorMatte
 >   Endianess: Undefined
 >   Colorspace: RGB
 >   Depth: 16-bit
 >   Channel depth:
 >     Red: 16-bit
 >     Green: 16-bit
 >     Blue: 16-bit
 >     Alpha: 1-bit
 >   Channel statistics:
 >     Red:
 >       Min: 0 (0)
 >       Max: 65535 (1)
 >       Mean: 55133.3 (0.84128)
 >       Standard deviation: 14422.3 (0.220071)
 >     Green:
 >       Min: 0 (0)
 >       Max: 65535 (1)
 >       Mean: 55057.5 (0.840123)
 >       Standard deviation: 14480.2 (0.220954)
 >     Blue:
 >       Min: 0 (0)
 >       Max: 65535 (1)
 >       Mean: 53650 (0.818646)
 >       Standard deviation: 14696 (0.224247)
 >     Opacity:
 >       Min: 0 (0)
 >       Max: 0 (0)
 >       Mean: 0 (0)
 >       Standard deviation: 0 (0)
 >   Rendering intent: Undefined
 >   Resolution: 72x72
 >   Units: Undefined
 >   Filesize: 69.6543kb
 >   Interlace: None
 >   Background color: white
 >   Border color: rgb(223,223,223)
 >   Matte color: grey74
 >   Transparent color: none
 >   Page geometry: 536x133+0+0
 >   Dispose: Undefined
 >   Iterations: 0
 >   Compression: Zip
 >   Orientation: Undefined
 >   Properties:
 > 
 > Image: kepler-003-85-montage.png
 >   Format: PNG (Portable Network Graphics)
 >   Class: DirectClass
 >   Geometry: 799x417+0+0
 >   Type: TrueColor
 >   Endianess: Undefined
 >   Colorspace: RGB
 >   Depth: 8-bit
 >   Channel depth:
 >     Red: 8-bit
 >     Green: 8-bit
 >     Blue: 8-bit
 >   Channel statistics:
 >     Red:
 >       Min: 0 (0)
 >       Max: 255 (1)
 >       Mean: 221.074 (0.866959)
 >       Standard deviation: 64.3881 (0.252502)
 >     Green:
 >       Min: 0 (0)
 >       Max: 255 (1)
 >       Mean: 228.147 (0.894692)
 >       Standard deviation: 48.0718 (0.188517)
 >     Blue:
 >       Min: 0 (0)
 >       Max: 255 (1)
 >       Mean: 229.612 (0.900439)
 >       Standard deviation: 45.124 (0.176957)
 >   Rendering intent: Undefined
 >   Resolution: 72x72
 >   Units: Undefined
 >   Filesize: 130.646kb
 >   Interlace: None
 >   Background color: white
 >   Border color: rgb(223,223,223)
 >   Matte color: grey74
 >   Transparent color: black
 >   Page geometry: 799x417+0+0
 >   Dispose: Undefined
 >   Iterations: 0
 >   Compression: Zip
 >   Orientation: Undefined
 >   Properties:
 > 
 > it would seem that the one that fails has an explicit alpha
 > channel.
 > 
 > I have compiled versions of mgp that have rendered the image
 > in question correctly, in the past, so I am thinking that it
 > is something a bit deeper.
 > 
 > I am trying to dig deeper and will report any findings. I'd be
 > happy to hear of anyone else's too,
 > Kevin
 > 
 > -- 
 > Kevin M. Buckley                                  Room:  CO327
 > School of Engineering and                         Phone: +64 4 463 5971
 >  Computer Science
 > Victoria University of Wellington
 > New Zealand
 >