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ImageExportInfo Class Reference |
Argument object for the function exportImage(). More...
#include <vigra/imageinfo.hxx>
Public Types | |
typedef ArrayVector< unsigned char > | ICCProfile |
Public Member Functions | |
Size2D | getCanvasSize () const |
const ICCProfile & | getICCProfile () const |
const char * | getMode () const |
const char * | getPixelType () const |
Diff2D | getPosition () const |
ImageExportInfo (const char *filename, const char *mode="w") | |
ImageExportInfo & | setCanvasSize (const Size2D &size) |
ImageExportInfo & | setCompression (const char *type) |
ImageExportInfo & | setFileName (const char *filename) |
ImageExportInfo & | setFileType (const char *) |
ImageExportInfo & | setICCProfile (const ICCProfile &profile) |
ImageExportInfo & | setPixelType (const char *) |
ImageExportInfo & | setPosition (const Diff2D &pos) |
ImageExportInfo & | setXResolution (float) |
ImageExportInfo & | setYResolution (float) |
Argument object for the function exportImage().
See exportImage() for usage example. This object must be used to define the properties of an image to be written to disk.
#include <vigra/imageinfo.hxx>
Namespace: vigra
typedef ArrayVector<unsigned char> ICCProfile |
ICC profiles (handled as raw data so far). see getICCProfile()/setICCProfile()
ImageExportInfo | ( | const char * | filename, |
const char * | mode = "w" |
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) |
Construct ImageExportInfo object.
The image will be stored under the given filename. The file type will be guessed from the extension unless overridden by setFileType(). Recognized extensions: '.bmp', '.exr', '.gif', '.jpeg', '.jpg', '.p7', '.png', '.pbm', '.pgm', '.pnm', '.ppm', '.ras', '.tif', '.tiff', '.xv', '.hdr'.
EXR support requires libopenexr, JPEG support requires libjpeg, PNG support requires libpng and TIFF support requires libtiff.
If the data is exported to TIFF, the mode may be "a", in which case the exported image is appended to the existing file, resulting in a multi-page TIFF image.
ImageExportInfo& setFileName | ( | const char * | filename | ) |
Set image file name.
The file type will be guessed from the extension unless overridden by setFileType(). Recognized extensions: '.bmp', '.exr', '.gif', '.jpeg', '.jpg', '.p7', '.png', '.pbm', '.pgm', '.pnm', '.ppm', '.ras', '.tif', '.tiff', '.xv', '.hdr'. EXR support requires libopenexr, JPEG support requires libjpeg, PNG support requires libpng and TIFF support requires libtiff.
const char* getMode | ( | ) | const |
Return the image file opening mode.
ImageExportInfo& setFileType | ( | const char * | ) |
Store image as given file type.
This will override any type guessed from the file name's extension. Recognized file types:
With the exception of TIFF, VIFF, PNG, and PNM all file types store only 1 byte (gray scale and mapped RGB) or 3 bytes (RGB) per pixel.
PNG can store UInt8 and UInt16 values, and supports 1 and 3 channel images. One additional alpha channel is also supported.
PNM can store 1 and 3 channel images with UInt8, UInt16 and UInt32 values in each channel.
TIFF and VIFF are additionally able to store short and long integers (2 or 4 bytes) and real values (32 bit float and 64 bit double) without conversion. So you will need to use TIFF or VIFF if you need to store images with high accuracy (the appropriate type to write is automatically derived from the image type to be exported). However, many other programs using TIFF (e.g. ImageMagick) have not implemented support for those pixel types. So don't be surprised if the generated TIFF is not readable in some cases. If this happens, export the image as 'unsigned char' or 'RGBValue<unsigned char>' by calling ImageExportInfo::setPixelType().
Support to reading and writing ICC color profiles is provided for TIFF, JPEG, and PNG images.
ImageExportInfo& setCompression | ( | const char * | type | ) |
Set compression type and quality.
This option is ignored when the target file format doesn't recognize the compression type. Valid arguments:
setCompression("JPEG QUALITY=number")
where the number denotes the desired quality). Some of these options (e.g. "JPEG-ARITH", "LZW", "B44", "B44A") may only be available when they have been enabled in the corresponding third-party library.
ImageExportInfo& setPixelType | ( | const char * | ) |
Set the pixel type of the image file. Possible values are:
Usage:
const char* getPixelType | ( | ) | const |
Get the pixel type of the image. Possible values are:
ImageExportInfo& setXResolution | ( | float | ) |
Set the image resolution in horizontal direction
ImageExportInfo& setYResolution | ( | float | ) |
Set the image resolution in vertical direction
ImageExportInfo& setPosition | ( | const Diff2D & | pos | ) |
Set the position of the upper Left corner on a global canvas.
Currently only supported by TIFF, PNG and OpenEXR files.
The offset is encoded in the XPosition and YPosition TIFF tags. TIFF requires that the resolution must also be set.
pos | position of the upper left corner in pixels (must be >= 0 for TIFF) |
Diff2D getPosition | ( | ) | const |
Get the position of the upper left corner on a global canvas.
Size2D getCanvasSize | ( | ) | const |
Get the size of the canvas, on which the image is positioned at getPosition()
ImageExportInfo& setCanvasSize | ( | const Size2D & | size | ) |
Get the size of the canvas, on which the image is positioned at getPosition()
const ICCProfile& getICCProfile | ( | ) | const |
Returns a reference to the ICC profile.
ImageExportInfo& setICCProfile | ( | const ICCProfile & | profile | ) |
Sets the ICC profile. ICC profiles are currently supported by TIFF, PNG and JPEG images. (Otherwise, the profile data is silently ignored.)
© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |
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