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Classes | Namespaces | Functions
Image Import/Export Facilities

Classes

class  ImageExportInfo
 Argument object for the function exportImage(). More...
class  ImageImportInfo
 Argument object for the function importImage(). More...

Namespaces

namespace  vigra::detail

Functions

template<... >
void exportFloatingScalarImage (...)
 Deprecated.
template<... >
void exportFloatingVectorImage (...)
 Deprecated.
template<... >
void exportImage (...)
 Write an image, given an vigra::ImageExportInfo object.
template<... >
void exportIntegralScalarImage (...)
 Deprecated.
template<... >
void exportIntegralVectorImage (...)
 Deprecated.
std::string impexListExtensions ()
 List the file extension VIGRA understands.
std::string impexListFormats ()
 List the image formats VIGRA can read and write.
template<... >
void importImage (...)
 Read the image specified by the given vigra::ImageImportInfo object.
template<... >
void importScalarImage (...)
 used for reading images of scalar type, such as integer and float grayscale.
template<... >
void importVectorImage (...)
 used for reading images of vector type, such as integer of float rgb.
bool isImage (char const *filename)
 Test whether a file is an image format known to VIGRA.
template<class ImageIterator , class Accessor , class SrcValueType >
void read_band (Decoder *dec, ImageIterator ys, Accessor a, SrcValueType)
 used for reading bands after the source data type has been figured out.
template<class ImageIterator , class Accessor , class SrcValueType >
void read_bands (Decoder *dec, ImageIterator ys, Accessor a, SrcValueType)
 used for reading bands after the source data type has been figured out.
template<class ImageIterator , class Accessor , class DstValueType >
void write_band (Encoder *enc, ImageIterator ul, ImageIterator lr, Accessor a, DstValueType)
 used for writing bands after the source data type has been figured out.
template<class ImageIterator , class Accessor , class DstValueType >
void write_bands (Encoder *enc, ImageIterator ul, ImageIterator lr, Accessor a, DstValueType)
 used for writing bands after the source data type has been figured out.

Detailed Description

supports GIF, TIFF, JPEG, BMP, PNM (PBM, PGM, PPM), PNG, SunRaster, KHOROS-VIFF formats


Function Documentation

std::string vigra::impexListFormats ( )

List the image formats VIGRA can read and write.

This is useful for creating error messages if VIGRA encounters an image format it doesn't recognize.

Usage:

#include <vigra/imageinfo.hxx>
Namespace: vigra

        std::cout << "supported formats: " << vigra::impexListFormats() << std::endl;
Examples:
boundarytensor.cxx, convert.cxx, edge.cxx, invert.cxx, invert_explicitly.cxx, profile.cxx, pyramid.cxx, resize.cxx, smooth.cxx, subimage.cxx, and watershed.cxx.
std::string vigra::impexListExtensions ( )

List the file extension VIGRA understands.

This is useful for creating file dialogs that only list image files VIGRA can actually import.

Usage:

#include <vigra/imageinfo.hxx>
Namespace: vigra

        std::cout << "supported extensions: " << vigra::impexListExtensions() << std::endl;
bool vigra::isImage ( char const *  filename)

Test whether a file is an image format known to VIGRA.

This checks the first few bytes of the file and compares them with the "magic strings" of each recognized image format.

Usage:

#include <vigra/imageinfo.hxx>
Namespace: vigra

    std::cout << "is image: " << vigra::isImage("foo.bmp") << std::endl;
void vigra::read_bands ( Decoder *  dec,
ImageIterator  ys,
Accessor  a,
SrcValueType   
)

used for reading bands after the source data type has been figured out.

#include <vigra/impex.hxx>
Namespace: vigra

Declaration:

        namespace vigra {
            template< class ImageIterator, class Accessor, class SrcValueType >
            void read_bands( Decoder * dec, ImageIterator ys, Accessor a, SrcValueType )
        }
Parameters:
decdecoder object through which the source data will be accessed
ysimage iterator referencing the upper left pixel of the destination image
aimage accessor for the destination image
void vigra::read_band ( Decoder *  dec,
ImageIterator  ys,
Accessor  a,
SrcValueType   
)

used for reading bands after the source data type has been figured out.

#include <vigra/impex.hxx>
Namespace: vigra

Declaration:

        namespace vigra {
            template< class ImageIterator, class Accessor, class SrcValueType >
            void read_band( Decoder * dec, ImageIterator ys, Accessor a, SrcValueType )
        }
Parameters:
decdecoder object through which the source data will be accessed
ysimage iterator referencing the upper left pixel of the destination image
aimage accessor for the destination image
void vigra::importVectorImage (   ...)

used for reading images of vector type, such as integer of float rgb.

#include <vigra/impex.hxx>
Namespace: vigra

Declaration:

        namespace vigra {
            template< class ImageIterator, class Accessor >
            void importVectorImage( const ImageImportInfo & info, ImageIterator iter, Accessor a )
        }

Paramters:

ImageIterator
the image iterator type for the destination image
Accessor
the image accessor type for the destination image
info
user supplied image import information
iter
image iterator referencing the upper left pixel of the destination image
a
image accessor for the destination image
void vigra::importScalarImage (   ...)

used for reading images of scalar type, such as integer and float grayscale.

#include <vigra/impex.hxx>
Namespace: vigra

Declaration:

        namespace vigra {
            template < class ImageIterator, class Accessor >
            void importScalarImage( const ImageImportInfo & info, ImageIterator iter, Accessor a )
        }

Paramters:

ImageIterator
the image iterator type for the destination image
Accessor
the image accessor type for the destination image
info
user supplied image import information
iter
image iterator referencing the upper left pixel of the destination image
a
image accessor for the destination image
void vigra::importImage (   ...)

Read the image specified by the given vigra::ImageImportInfo object.

Declarations:

pass arguments explicitly:

        namespace vigra {
            template <class ImageIterator, class Accessor>
            void
            importImage(ImageImportInfo const & image, ImageIterator iter, Accessor a)
        }

use argument objects in conjunction with Argument Object Factories :

        namespace vigra {
            template <class ImageIterator, class Accessor>
            inline void
            importImage(ImageImportInfo const & image, pair<ImageIterator, Accessor> dest)
        }

Usage:

#include <vigra/impex.hxx>
Namespace: vigra

        vigra::ImageImportInfo info("myimage.gif");

        if(info.isGrayscale())
        {
            // create byte image of appropriate size
            vigra::BImage in(info.width(), info.height());

            vigra::importImage(info, destImage(in)); // read the image
            ...
        }
        else
        {
            // create byte RGB image of appropriate size
            vigra::BRGBImage in(info.width(), info.height());

            vigra::importImage(info, destImage(in)); // read the image
            ...
        }

Preconditions:

  • the image file must be readable
  • the file type must be one of

    "BMP"
    Microsoft Windows bitmap image file.
    "GIF"
    CompuServe graphics interchange format; 8-bit color.
    "JPEG"
    Joint Photographic Experts Group JFIF format; compressed 24-bit color. (only available if libjpeg is installed)
    "PNG"
    Portable Network Graphic. (only available if libpng is installed)
    "PBM"
    Portable bitmap format (black and white).
    "PGM"
    Portable graymap format (gray scale).
    "PNM"
    Portable anymap.
    "PPM"
    Portable pixmap format (color).
    "SUN"
    SUN Rasterfile.
    "TIFF"
    Tagged Image File Format. (only available if libtiff is installed.)
    "VIFF"
    Khoros Visualization image file.
Examples:
boundarytensor.cxx, convert.cxx, edge.cxx, invert.cxx, invert_explicitly.cxx, profile.cxx, pyramid.cxx, resize.cxx, smooth.cxx, subimage.cxx, and watershed.cxx.
void vigra::write_bands ( Encoder *  enc,
ImageIterator  ul,
ImageIterator  lr,
Accessor  a,
DstValueType   
)

used for writing bands after the source data type has been figured out.

#include <vigra/impex.hxx>
Namespace: vigra

Declaration:

        namespace vigra {
            template< class ImageIterator, class Accessor, class DstValueType >
            void write_bands( Encoder * enc, ImageIterator ul, ImageIterator lr, Accessor a, DstValueType )
        }
Parameters:
encencoder object through which the destination data will be accessed
ulimage iterator referencing the upper left pixel of the source image
lrimage iterator referencing the lower right pixel of the source image
aimage accessor for the source image
void vigra::write_band ( Encoder *  enc,
ImageIterator  ul,
ImageIterator  lr,
Accessor  a,
DstValueType   
)

used for writing bands after the source data type has been figured out.

#include <vigra/impex.hxx>
Namespace: vigra

Declaration:

        namespace vigra {
            template< class ImageIterator, class Accessor, class DstValueType >
            void write_band( Encoder * enc, ImageIterator ul, ImageIterator lr, Accessor a, DstValueType )
        }
Parameters:
encencoder object through which the destination data will be accessed
ulimage iterator referencing the upper left pixel of the source image
lrimage iterator referencing the lower right pixel of the source image
aimage accessor for the source image
void vigra::exportFloatingVectorImage (   ...)

Deprecated.

Use exportImage() instead.

Declaration:

        namespace vigra {
            template < class SrcIterator, class SrcAccessor >
            void exportFloatingVectorImage( SrcIterator sul, SrcIterator slr, SrcAccessor sget,
                                            const ImageExportInfo & info )
        }
void vigra::exportIntegralVectorImage (   ...)

Deprecated.

Use exportImage() instead.

Declaration:

        namespace vigra {
            template < class SrcIterator, class SrcAccessor >
            void exportIntegralVectorImage( SrcIterator sul, SrcIterator slr, SrcAccessor sget,
                                            const ImageExportInfo & info )
        }
void vigra::exportFloatingScalarImage (   ...)

Deprecated.

Use exportImage() instead.

Declaration:

        namespace vigra {
            template < class SrcIterator, class SrcAccessor >
            void exportFloatingScalarImage( SrcIterator sul, SrcIterator slr, SrcAccessor sget,
                                            const ImageExportInfo & info )
        }
void vigra::exportIntegralScalarImage (   ...)

Deprecated.

Use exportImage() instead.

Declaration:

        namespace vigra {
            template < class SrcIterator, class SrcAccessor >
            void exportIntegralScalarImage( SrcIterator sul, SrcIterator slr, SrcAccessor sget,
                                            const ImageExportInfo & info )
        }
void vigra::exportImage (   ...)

Write an image, given an vigra::ImageExportInfo object.

If the file format to be exported to supports the pixel type of the source image, the pixel type will be kept (e.g. float can be stored as TIFF without conversion, in contrast to most other image export toolkits). Otherwise, the pixel values are transformed to the range 0.255 and converted to unsigned char. Currently, the following file formats are supported. The pixel types given in brackets are those that are written without conversion:

"BMP"
Microsoft Windows bitmap image file (pixel types: UINT8 as gray and RGB).
"GIF"
CompuServe graphics interchange format; 8-bit color (pixel types: UINT8 as gray and RGB).
"JPEG"
Joint Photographic Experts Group JFIF format; compressed 24-bit color (pixel types: UINT8 as gray and RGB). (only available if libjpeg is installed)
"PNG"
Portable Network Graphic (pixel types: UINT8 and UINT16 with up to 4 channels). (only available if libpng is installed)
"PBM"
Portable bitmap format (black and white).
"PGM"
Portable graymap format (pixel types: UINT8, INT16, INT32 as gray scale)).
"PNM"
Portable anymap (pixel types: UINT8, INT16, INT32 as gray and RGB).
"PPM"
Portable pixmap format (pixel types: UINT8, INT16, INT32 as RGB).
"SUN"
SUN Rasterfile (pixel types: UINT8 as gray and RGB).
"TIFF"
Tagged Image File Format (pixel types: UINT8, INT16, INT32, FLOAT, DOUBLE with up to 4 channels). (only available if libtiff is installed.)
"VIFF"
Khoros Visualization image file (pixel types: UINT8, INT16, INT32, FLOAT, DOUBLE with arbitrary many channels).

Declarations:

pass arguments explicitly:

    namespace vigra {
        template <class SrcIterator, class SrcAccessor>
        void exportImage(SrcIterator sul, SrcIterator slr, SrcAccessor sget,
                         ImageExportInfo const & info)
    }

use argument objects in conjunction with Argument Object Factories :

    namespace vigra {
        template <class SrcIterator, class SrcAccessor>
        void exportImage(SrcIterator sul, SrcIterator slr, SrcAccessor sget,
                         ImageExportInfo const & info)
    }

Usage:

#include <vigra/impex.hxx>
Namespace: vigra

    vigra::BRGBImage out(w, h);
    ...

    // write as JPEG image, using compression quality 80
    vigra::exportImage(srcImageRange(out),
                      vigra::ImageExportInfo("myimage.jpg").setCompression("80"));


    // force it to a particular pixel type (the pixel type must be supported by the
    // desired image file format, otherwise an \ref vigra::PreconditionViolation exception will be thrown)
    vigra::exportImage(srcImageRange(out),
                      vigra::ImageExportInfo("myINT16image.tif").setPixelType("INT16"));

Preconditions:

  • the image file must be writable.
  • the file type must be one of the supported file types.

Examples:
boundarytensor.cxx, convert.cxx, edge.cxx, invert.cxx, invert_explicitly.cxx, palette.cxx, profile.cxx, pyramid.cxx, resize.cxx, smooth.cxx, subimage.cxx, voronoi.cxx, and watershed.cxx.

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

html generated using doxygen and Python
vigra 1.7.0 (Thu Aug 25 2011)