I have a DPX file that from identify's output appears to be in Log
colorspace. When working with the file such as using convert or display if
I don't set any colorspace conversion information and simply pipe the output
to my display with the "x:" output descriptor the image looks correct. If I
attempt to convert this log encoded DPX into a file though the resultant
file is overly dark. The only file format that the resultant converted file
looks correct in is JPEG. I'm trying to get an sRGB encoded file format of
some sort out and to understand why the Log colorspace is so hard to work
with in comparison to the RGB colorspace.
These commands display the dpx properly on my monitor:
convert foo.dpx x:
convert -colorspace log foo.dpx x:
convert -colorspace log foo.dpx foo.jpg && display foo.jpg
These command will produce a file that is too dark when displayed on my
monitor though:
convert -colorspace log foo.dpx -colorspace srgb foo.png && display foo.png
convert -colorspace log foo.dpx foo.png && display foo.png
convert -colorspace log foo.dpx foo.png && display foo.tif
convert -colorspace log foo.dpx foo.png && display foo.tga
convert -colorspace log foo.dpx foo.png && display foo.ppm
I'm trying to figure out what "display" is "doing" to get the file to
display properly. This is most likely a lack of knowledge on dealing with
log encoded files but it has me stumped. Any pointers in dealing with Log
DPX conversion would be helpful. Thanks!
Here is the identify -verbose for the Log encoded DPX:
Format: DPX (SMPTE 268M-2003 (DPX 2.0))
Class: DirectClass
Geometry: 2048x1168+0+0
Resolution: 72x72
Print size: 28.4444x16.2222
Units: Undefined
Type: TrueColor
Base type: TrueColor
Endianess: MSB
Colorspace: Log
Depth: 10-bit
Channel depth:
red: 10-bit
green: 10-bit
blue: 10-bit
Channel statistics:
red:
min: 0.0078125 (7.62951e-06)
max: 783.761 (0.765404)
mean: 114.691 (0.112005)
standard deviation: 113.953 (0.111284)
kurtosis: -0.579503
skewness: 0.659179
green:
min: 0.0078125 (7.62951e-06)
max: 654.637 (0.639304)
mean: 111.384 (0.108775)
standard deviation: 110.572 (0.107982)
kurtosis: -0.335723
skewness: 0.870409
blue:
min: 2.00974 (0.00196266)
max: 480.47 (0.469216)
mean: 81.5532 (0.079643)
standard deviation: 81.4716 (0.0795633)
kurtosis: 0.281843
skewness: 1.23579
Image statistics:
Overall:
min: 0.0078125 (7.62951e-06)
max: 783.761 (0.765404)
mean: 76.907 (0.0751057)
standard deviation: 100.501 (0.0981469)
kurtosis: 0.702316
skewness: 1.3027
Rendering intent: Undefined
Interlace: None
Background color: log(100.001%,100.001%,100.001%)
Border color: log(87.4517%,87.4517%,87.4517%)
Matte color: log(74.1184%,74.1184%,74.1184%)
Transparent color: log(0.000762951%,0.000762951%,0.000762951%)
Page geometry: 2048x1168+0+0
Dispose: Undefined
Iterations: 0
Compression: Undefined
Orientation: TopLeft
Properties:
create-date: 2009-11-17T00:53:28-08:00
document: 15_00_37_19.01296933.dpx
dpx:file.creator: daVinci
dpx:file.ditto.key: 1
dpx:file.filename: 15_00_37_19.01296933.dpx
dpx:file.timestamp: 2009:10:19:07:08:17:EDT
dpx:file.version: V1.0
dpx:film.count: 6223
dpx:film.frame_position: 119880
dpx:film.frame_rate: 24
dpx:film.held_count: 0
dpx:film.offset: 16
dpx:film.prefix: 677870
dpx:film.sequence_extent: 69
dpx:film.type: 19
dpx:image.orientation: 0
dpx:orientation.aspect_ratio: 1x1
dpx:orientation.border: 0x0+0+0
dpx:orientation.device: 01500
dpx:orientation.x_offset: 0
dpx:orientation.x_size: 2048
dpx:orientation.y_offset: 0
dpx:orientation.y_size: 1168
dpx:television.frame_rate: 24
dpx:television.time.code: 15:00:38:21
dpx:television.user.bits: 00:00:00:00
dpx:user.id: daVinci
modify-date: 2009-10-19T07:12:08-07:00
signature:
3ccaed5586434d32396e7abadbb98fffa6221db721c0a9e6b2fdccf83d2ec42e
software: daVinci
Profiles:
Profile-dpx:user.data: 6112 bytes
Artifacts:
verbose: true
Tainted: False
Filesize: 9.133mb
Number pixels: 2.281mb
Version: ImageMagick 6.5.3-10 2009-09-18 Q16 HDRI OpenMP
http://www.imagemagick.org
_______________________________________________
Magick-users mailing list
[email protected]
http://studio.imagemagick.org/mailman/listinfo/magick-users
