16-bit DPX with alpha? How can this be?
Posted: 2011-05-18T15:34:18-07:00
Hi all,
I'm using convert to read a DPX frame, scale it, blend a 32-bit Targa over it, draw some text, and save it back out as a DPX file. Even though I'm specifying "-depth 10" and even trying to strip out any alpha data with "-channel rgb", I am somehow outputting 16-bpc DPX frames with alpha embedded, or at least identify.exe thinks so! Needless to say, other programs freak out on this alien format as well. This is running on 6.6.9.9-Q16.
Here is my 'identify -verbose" output"
And here are the command lines I'm using - it's a two-step process because I haven't had the strength to in-line the first resize operation (that'll come next). I had some issues with an unexpected source frame size yesterday and started making changes to accomodate it, and before I could say "work slowly and incrementally", the wheels had fallen off the bus and I've got alpha channels in every single frame I create no matter how I try to avoid them. Weird, right? Can any kind souls shed any light on my woe? It's makin' me cah-raaayzee!
I'm using convert to read a DPX frame, scale it, blend a 32-bit Targa over it, draw some text, and save it back out as a DPX file. Even though I'm specifying "-depth 10" and even trying to strip out any alpha data with "-channel rgb", I am somehow outputting 16-bpc DPX frames with alpha embedded, or at least identify.exe thinks so! Needless to say, other programs freak out on this alien format as well. This is running on 6.6.9.9-Q16.
Here is my 'identify -verbose" output"
Code: Select all
Format: DPX (SMPTE 268M-2003 (DPX 2.0))
Class: DirectClass
Geometry: 2048x1168+0+0
Resolution: 72x72
Print size: 28.4444x16.2222
Units: Undefined
Type: TrueColorMatte
Base type: TrueColor
Endianess: MSB
Colorspace: RGB
Depth: 10/16-bit
Channel depth:
red: 16-bit
green: 16-bit
blue: 16-bit
alpha: 16-bit
Channel statistics:
Red:
min: 0 (0)
max: 1023 (0.999039)
mean: 144.267 (0.140888)
standard deviation: 107.629 (0.105108)
kurtosis: 21.3653
skewness: 3.80073
Green:
min: 0 (0)
max: 1023 (0.999039)
mean: 88.8943 (0.0868122)
standard deviation: 105.165 (0.102702)
kurtosis: 33.2795
skewness: 5.32321
Blue:
min: 0 (0)
max: 1023 (0.999039)
mean: 68.5614 (0.0669556)
standard deviation: 105.852 (0.103373)
kurtosis: 36.4368
skewness: 5.71321
Alpha:
min: 0 (0)
max: 1023 (0.999039)
mean: 1022.5 (0.998551)
standard deviation: 22.5998 (0.0220705)
kurtosis: 2043
skewness: 45.2217
Image statistics:
Overall:
min: 0 (0)
max: 1024 (1)
mean: 75.8017 (0.0740262)
standard deviation: 92.6812 (0.0905103)
kurtosis: 47.3923
skewness: 6.46798
Alpha: rgba(99.9039%,99.9039%,0%,0) #FFC0FFC000000000
Rendering intent: Undefined
Interlace: None
Background color: white
Border color: rgba(223,223,223,1)
Matte color: grey74
Transparent color: none
Compose: Over
Page geometry: 2048x1168+0+0
Dispose: Undefined
Iterations: 0
Compression: Undefined
Orientation: TopLeft
Properties:
date:create: 2011-05-18T14:50:37-07:00
date:modify: 2011-05-18T14:54:09-07:00
dpx:file.creator: ImageMagick 6.6.9-9 2011-05-10 Q16 http://www.imagemagick.org
dpx:file.ditto.key: 1
dpx:file.timestamp: 2011-05-18T14:53:19-07:
dpx:file.version: V2.0
dpx:film.frame_position: 0
dpx:film.held_count: 0
dpx:film.sequence_extent: 0
dpx:image.orientation: 0
dpx:orientation.aspect_ratio: 0x0
dpx:orientation.border: 0x0+0+0
dpx:orientation.x_offset: 0
dpx:orientation.x_size: 0
dpx:orientation.y_offset: 0
dpx:orientation.y_size: 0
dpx:television.time.code: 00:00:00:00
dpx:television.user.bits: 00:00:00:00
signature: cead80091a236e98cdf0b31f5d84a51791c44dfaacbffd9a3c09f8fb0db9bbfb
software: ImageMagick 6.6.9-9 2011-05-10 Q16 http://www.imagemagick.org
Artifacts:
verbose: true
Tainted: False
Filesize: 12.77MBB
Number pixels: 2.392MB
Pixels per second: 23.45MB
User time: 0.078u
Elapsed time: 0:01.101
Version: ImageMagick 6.6.5-3 2010-10-22 Q16 http://www.imagemagick.orgCode: Select all
S:\2d\ImageMagik\ImageMagick\imconvert.exe "Z:\Test\shots\CF_124_010\composites\CF_124_010_v02_cc\2048x1168\CF_124_010_comp_v02.0026.dpx" -resize 1920x1080 -channel rgb -normalize -flatten c:\tmpslate.tgaCode: Select all
S:\2d\ImageMagik\ImageMagick\imconvert.exe -composite -gravity center "c:\tmpslate.tga" "S:\_Degobah4.0\Images\Slates\GenericSlate_R05.0001.tga" -depth 8 -fill WHITE -font "c:\WINDOWS\Fonts\HelveticaNeueLTCom-Md.ttf" -pointsize 20 -gravity northwest -draw "text 582,373 'PROJECT'" -fill WHITE -pointsize 40 -gravity northwest -draw "text 690,370 'Test '" -pointsize 20 -gravity northwest -draw "text 582,430 'SCENE'" -fill WHITE -pointsize 40 -gravity northwest -draw "text 690,428 'CF_124_010 v02'" -font "C:\WINDOWS\Fonts\HelveticaNeueLTCom-Md.ttf" -fill WHITE -pointsize 20 -gravity northwest -draw "text 582,487 'LENGTH'" -fill "rgb(124,124,124)" -pointsize 30 -gravity northwest -draw "text 690,487 '55 (0001 - 0055)'" -fill WHITE -pointsize 20 -gravity northwest -draw "text 582,534 'DATE'" -fill "rgb(124,124,124)" -pointsize 30 -gravity northwest -draw "text 690,534 '5/18/2011'" -fill WHITE -pointsize 20 -gravity northwest -draw "text 582,578 'NOTES'" -fill "rgb(124,124,124)" -pointsize 30 -gravity northwest -draw "text 690,578''"' -resize 2048x1168 -channel rgb -normalize -flatten Z:\Test\shots\CF_124_010\composites\CF_124_010_v02_cc\2048x1168\CF_124_010_comp_v02.0000.dpx