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HDF5 1.14.5
API Reference
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HDF5 Images API (H5IM)

Detailed Description

Creating and manipulating HDF5 datasets intended to be interpreted as images (H5IM)

The specification for the Images API is presented in another document: HDF5 Image and Palette Specification Version 1.2 This version of the API is primarily concerned with two dimensional raster data similar to HDF4 Raster Images. The HDF5 Images API uses the HDF5 Lite APIs (H5LT,H5LD).

Note
Programming hints:
To use any of these functions or subroutines, you must first include the relevant include file (C) or module (Fortran) in your application.
The following line includes the HDF5 Images package, H5IM, in C applications:
#include "hdf5_hl.h"
This line includes the H5IM module in Fortran applications:
use h5im
This module contains Fortran interfaces for H5IM.
Definition H5IMff.F90:35

Functions

H5_HLDLL herr_t H5IMmake_image_8bit (hid_t loc_id, const char *dset_name, hsize_t width, hsize_t height, const unsigned char *buffer)
 Creates and writes an image.
 
H5_HLDLL herr_t H5IMmake_image_24bit (hid_t loc_id, const char *dset_name, hsize_t width, hsize_t height, const char *interlace, const unsigned char *buffer)
 Creates and writes a true color image.
 
H5_HLDLL herr_t H5IMget_image_info (hid_t loc_id, const char *dset_name, hsize_t *width, hsize_t *height, hsize_t *planes, char *interlace, hssize_t *npals)
 Gets information about an image dataset (dimensions, interlace mode and number of associated palettes).
 
H5_HLDLL herr_t H5IMread_image (hid_t loc_id, const char *dset_name, unsigned char *buffer)
 Reads image data from disk.
 
H5_HLDLL herr_t H5IMmake_palette (hid_t loc_id, const char *pal_name, const hsize_t *pal_dims, const unsigned char *pal_data)
 Creates and writes a palette.
 
H5_HLDLL herr_t H5IMlink_palette (hid_t loc_id, const char *image_name, const char *pal_name)
 Attaches a palette to an image.
 
H5_HLDLL herr_t H5IMunlink_palette (hid_t loc_id, const char *image_name, const char *pal_name)
 Detaches a palette from an image.
 
H5_HLDLL herr_t H5IMget_npalettes (hid_t loc_id, const char *image_name, hssize_t *npals)
 Gets the number of palettes associated to an image.
 
H5_HLDLL herr_t H5IMget_palette_info (hid_t loc_id, const char *image_name, int pal_number, hsize_t *pal_dims)
 Gets information about a palette dataset (dimensions).
 
H5_HLDLL herr_t H5IMget_palette (hid_t loc_id, const char *image_name, int pal_number, unsigned char *pal_data)
 Gets the palette dataset.
 
H5_HLDLL herr_t H5IMis_image (hid_t loc_id, const char *dset_name)
 Inquires if a dataset is an image.
 
H5_HLDLL herr_t H5IMis_palette (hid_t loc_id, const char *dset_name)
 Inquires if a dataset is a palette.
 

Function Documentation

◆ H5IMget_image_info()

H5_HLDLL herr_t H5IMget_image_info ( hid_t  loc_id,
const char *  dset_name,
hsize_t width,
hsize_t height,
hsize_t planes,
char *  interlace,
hssize_t npals 
)

Gets information about an image dataset (dimensions, interlace mode and number of associated palettes).


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]dset_nameThe name of the dataset
[out]widthThe width of the image
[out]heightThe height of the image
[out]planesThe number of color planes of the image
[out]interlaceThe interlace mode of the image
[out]npalsThe number of palettes associated to the image
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMget_image_info() gets information about an image named dset_name attached to the file or group specified by the identifier loc_id.

◆ H5IMget_npalettes()

H5_HLDLL herr_t H5IMget_npalettes ( hid_t  loc_id,
const char *  image_name,
hssize_t npals 
)

Gets the number of palettes associated to an image.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]image_nameThe name of the image dataset
[out]npalsThe number of palettes
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMget_npalettes() gets the number of palettes associated to an image specified by image_name.

◆ H5IMget_palette()

H5_HLDLL herr_t H5IMget_palette ( hid_t  loc_id,
const char *  image_name,
int  pal_number,
unsigned char *  pal_data 
)

Gets the palette dataset.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]image_nameThe name of the image dataset
[in]pal_numberThe zero based index that identifies the palette
[out]pal_dataThe palette dataset
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMget_palette() gets the palette dataset identified by pal_number (a zero based index) associated to an image specified by image_name.

◆ H5IMget_palette_info()

H5_HLDLL herr_t H5IMget_palette_info ( hid_t  loc_id,
const char *  image_name,
int  pal_number,
hsize_t pal_dims 
)

Gets information about a palette dataset (dimensions).


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]image_nameThe name of the image dataset
[in]pal_numberThe zero based index that identifies the palette
[out]pal_dimsThe dimensions of the palette dataset
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMget_palette_info() gets the dimensions of the palette dataset identified by pal_number (a zero based index) associated to an image specified by image_name.

◆ H5IMis_image()

H5_HLDLL herr_t H5IMis_image ( hid_t  loc_id,
const char *  dset_name 
)

Inquires if a dataset is an image.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]dset_nameThe name of the dataset
Returns
Returns zero (false), a positive (true) or a negative (failure) value.

H5IMis_image() inquires if a dataset named dset_name, attached to the file or group specified by the identifier loc_id, is an image based on the HDF5 Image and Palette Specification.

◆ H5IMis_palette()

H5_HLDLL herr_t H5IMis_palette ( hid_t  loc_id,
const char *  dset_name 
)

Inquires if a dataset is a palette.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]dset_nameThe name of the dataset
Returns
Returns zero (false), a positive (true) or a negative (failure) value.

H5IMis_palette() inquires if a dataset named dset_name, attached to the file or group specified by the identifier loc_id, is a palette based on the HDF5 Image and Palette Specification.

◆ H5IMlink_palette()

H5_HLDLL herr_t H5IMlink_palette ( hid_t  loc_id,
const char *  image_name,
const char *  pal_name 
)

Attaches a palette to an image.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]image_nameThe name of the dataset to attach the palette to
[in]pal_nameThe name of the palette
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMlink_palette() attaches a palette named pal_name to an image specified by image_name. The image dataset may or not already have an attached palette. If it has, the array of palette references is extended to hold the reference to the new palette.

◆ H5IMmake_image_24bit()

H5_HLDLL herr_t H5IMmake_image_24bit ( hid_t  loc_id,
const char *  dset_name,
hsize_t  width,
hsize_t  height,
const char *  interlace,
const unsigned char *  buffer 
)

Creates and writes a true color image.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]dset_nameThe name of the dataset to create
[in]widthThe width of the image
[in]heightThe height of the image
[in]interlaceString defining the interlace mode
[in]bufferBuffer with data to be written to the dataset
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMmake_image_24bit() creates and writes a dataset named dset_name attached to the file or group specified by the identifier loc_id. This function defines a true color image conforming to the HDF5 Image and Palette specification. The function assumes that the image data is of the type H5T_NATIVE_UCHAR.

A true color image is an image where the pixel storage contains several color planes. In a 24 bit RGB color model, these planes are red, green and blue. In a true color image the stream of bytes can be stored in several different ways, thus defining the interlace (or interleaving) mode. The 2 most used types of interlace mode are interlace by pixel and interlace by plane. In the 24 bit RGB color model example, interlace by plane means all the red components for the entire dataset are stored first, followed by all the green components, and then by all the blue components. Interlace by pixel in this example means that for each pixel the sequence red, green, blue is defined. In this function, the interlace mode is defined in the parameter interlace, a string that can have the values INTERLACE_PIXEL or INTERLACE_PLANE.

◆ H5IMmake_image_8bit()

H5_HLDLL herr_t H5IMmake_image_8bit ( hid_t  loc_id,
const char *  dset_name,
hsize_t  width,
hsize_t  height,
const unsigned char *  buffer 
)

Creates and writes an image.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]dset_nameThe name of the dataset to create
[in]widthThe width of the image
[in]heightThe height of the image
[in]bufferBuffer with data to be written to the dataset
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMmake_image_8bit() creates and writes a dataset named dset_name attached to the file or group specified by the identifier loc_id. Attributes conforming to the HDF5 Image and Palette specification for an indexed image are attached to the dataset, thus identifying it as an image. The image data is of the type H5T_NATIVE_UCHAR. An indexed image is an image in which each each pixel information storage is an index to a table palette.

◆ H5IMmake_palette()

H5_HLDLL herr_t H5IMmake_palette ( hid_t  loc_id,
const char *  pal_name,
const hsize_t pal_dims,
const unsigned char *  pal_data 
)

Creates and writes a palette.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]pal_nameThe name of the palette
[in]pal_dimsAn array of the size of the palette dimensions
[in]pal_dataBuffer with data to be written to the dataset
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMmake_palette() creates and writes a dataset named pal_name. Attributes conforming to the HDF5 Image and Palette specification are attached to the dataset, thus identifying it as a palette. The palette data is of the type H5T_NATIVE_UCHAR.

◆ H5IMread_image()

H5_HLDLL herr_t H5IMread_image ( hid_t  loc_id,
const char *  dset_name,
unsigned char *  buffer 
)

Reads image data from disk.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]dset_nameThe name of the dataset to create
[out]bufferBuffer with data to store the image
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMread_image() reads a dataset named dset_name attached to the file or group specified by the identifier loc_id.

◆ H5IMunlink_palette()

H5_HLDLL herr_t H5IMunlink_palette ( hid_t  loc_id,
const char *  image_name,
const char *  pal_name 
)

Detaches a palette from an image.


Parameters
[in]loc_idLocation identifier. The identifier may be that of a file or group.
[in]image_nameThe name of the image dataset
[in]pal_nameThe name of the palette
Returns
Returns a non-negative value if successful; otherwise, returns a negative value.

H5IMunlink_palette() detaches a palette from an image specified by image_name.