How to write 10 bit RGB to files
Posted: 2009-06-23T06:34:50-07:00
Hello again!
I'm using ImageMagick-6.5.3-3-Q16 with VC++ and want to write 10 bit RGB to files (actually DPX but even BMP does not work).
What I'm doing is:
1. reading an 8 bit BMP
2. extracting the image data to a char array
3. storing the char values in a short array
4. initializing an Magick::Image with the short array
5. writing the image
6. getting black images only
The following code describes what I'm doing - resulting in BLACK IMAGES!
Any help to get the real images is appreciated 
Thanks in advance,
Nicola
EDIT: this is what identify says about the DPX - actually looking good. Especially, the histogram predicts more than a black image, I think
I'm using ImageMagick-6.5.3-3-Q16 with VC++ and want to write 10 bit RGB to files (actually DPX but even BMP does not work).
What I'm doing is:
1. reading an 8 bit BMP
2. extracting the image data to a char array
3. storing the char values in a short array
4. initializing an Magick::Image with the short array
5. writing the image
6. getting black images only
The following code describes what I'm doing - resulting in BLACK IMAGES!
Code: Select all
// Initialize ImageMagick install location for Windows
Magick::InitializeMagick( argv[0] );
Magick::Image cImageIn( "test.bmp" );
// write image data to external char array => seems to work fine
cImageIn.write( 0, 0, pcBmpBuffer->getWidth(), pcBmpBuffer->getHeight(), "BGR", MagickCore::CharPixel, pcBmpBuffer->getImage() );
// write image data to BMP => works fine
cImageIn.write( "test_IM.bmp" );
// write image data to DPX => works fine
cImageIn.write( "test_IM.dpx" );
// convert char data to short data
const int iRgbArraySize = pcBmpBuffer->getImageBufferSize();
short* psRgbImage = new short[ iRgbArraySize ];
for( int iRow = 0; iRow < cDvsBuffer.getRows(); ++iRow )
{
for( int iCol = 0; iCol < cDvsBuffer.getCols(); ++iCol )
{
short* psDestPix = &psRgbImage[ iRow * 3 * cDvsBuffer.getCols() + iCol * 3 ];
UChar* pucSrcPix = &pcBmpBuffer->getImage()[ iRow * 3 * cDvsBuffer.getCols() + iCol * 3 ];
// char => short
psDestPix1[ 0 ] = pucSrcPix[ 2 ]; // R
psDestPix1[ 1 ] = pucSrcPix[ 1 ]; // G
psDestPix1[ 2 ] = pucSrcPix[ 0 ]; // B
}
}
// Magick::Blob cImageBlob( psRgbImage, iRgbArraySize * sizeof( short ) );
// Magick::Image cMagickImage( cImageBlob, Magick::Geometry( cDvsBuffer.getCols(), cDvsBuffer.getRows() )/*, 10*/, "RGB" );
Magick::Image cMagickImage(
pcBmpBuffer->getWidth(),
pcBmpBuffer->getHeight(),
"RGB",
Magick::ShortPixel,
psRgbImage );
// this returns exactly the pixel value I expect
const MagickCore::PixelPacket* pcPP = cMagickImage.getConstPixels( 1000, 1000, 1920, 1080 );
// write the image => result in a black image
cMagickImage.write( "testOut.dpx" );
// FOR TESTING: write also a BMP => result in a black image
cMagickImage.write( "testOut.bmp" );
Thanks in advance,
Nicola
EDIT: this is what identify says about the DPX - actually looking good. Especially, the histogram predicts more than a black image, I think
Image: C:\LargeFileConvRes-C\Take_01_Halbzeit1\Take_01_Halbzeit1_cam32_0000171.dpx
Format: DPX (SMPTE 268M-2003 (DPX 2.0))
Class: DirectClass
Geometry: 1920x1080+0+0
Resolution: 72x72
Print size: 26.6667x15
Units: Undefined
Type: TrueColor
Base type: TrueColor
Endianess: MSB
Colorspace: RGB
Depth: 16/14-bit
Channel depth:
red: 14-bit
green: 14-bit
blue: 14-bit
Channel statistics:
red:
min: 32 (0.000488289)
max: 1020 (0.0155642)
mean: 491.907 (0.00750601)
standard deviation: 342.012 (0.00521877)
kurtosis: -1.37131
skewness: 0.534891
green:
min: 32 (0.000488289)
max: 1000 (0.015259)
mean: 486.725 (0.00742695)
standard deviation: 339.865 (0.00518601)
kurtosis: -1.36237
skewness: 0.518388
blue:
min: 24 (0.000366217)
max: 1020 (0.0155642)
mean: 459.711 (0.00701474)
standard deviation: 352.045 (0.00537186)
kurtosis: -1.31709
skewness: 0.657898
Image statistics:
Overall:
min: 24 (0.000366217)
max: 1020 (0.0155642)
mean: 359.586 (0.00548693)
standard deviation: 363.805 (0.00555131)
kurtosis: -0.838053
skewness: 0.815415
Rendering intent: Undefined
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 1920x1080+0+0
Dispose: Undefined
Iterations: 0
Compression: Undefined
Orientation: TopLeft
Properties:
create-date: 2009-06-23T13:35:53+02:00
dpx:file.creator: ImageMagick 6.5.3-3 2009-06-04 Q16 http://www.imagemagick.org
dpx:file.ditto.key: 1
dpx:file.timestamp: 2009-06-23T15:36:28+02:
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
modify-date: 2009-06-23T15:36:28+02:00
signature: 04bdd8dfc52ad1c6321a48fb75948e73a4ba08ac432301a77363b13b2e44bcb4
software: ImageMagick 6.5.3-3 2009-06-04 Q16 http://www.imagemagick.org
Artifacts:
verbose: true
Tainted: False
Filesize: 11.87mb
Number pixels: 1.978mb
Version: ImageMagick 6.5.3-8 2009-06-16 Q16 OpenMP http://www.imagemagick.org