HDF5 1.14.5
API Reference
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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).
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. | |
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).
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | dset_name | The name of the dataset |
[out] | width | The width of the image |
[out] | height | The height of the image |
[out] | planes | The number of color planes of the image |
[out] | interlace | The interlace mode of the image |
[out] | npals | The number of palettes associated to the image |
H5IMget_image_info() gets information about an image named dset_name
attached to the file or group specified by the identifier loc_id
.
Gets the number of palettes associated to an image.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | image_name | The name of the image dataset |
[out] | npals | The number of palettes |
H5IMget_npalettes() gets the number of palettes associated to an image specified by image_name
.
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.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | image_name | The name of the image dataset |
[in] | pal_number | The zero based index that identifies the palette |
[out] | pal_data | The palette dataset |
H5IMget_palette() gets the palette dataset identified by pal_number
(a zero based index) associated to an image specified by image_name
.
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).
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | image_name | The name of the image dataset |
[in] | pal_number | The zero based index that identifies the palette |
[out] | pal_dims | The dimensions of the palette dataset |
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
.
Inquires if a dataset is an image.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | dset_name | The name of the dataset |
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.
Inquires if a dataset is a palette.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | dset_name | The name of the dataset |
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.
Attaches a palette to an image.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | image_name | The name of the dataset to attach the palette to |
[in] | pal_name | The name of the palette |
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.
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.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | dset_name | The name of the dataset to create |
[in] | width | The width of the image |
[in] | height | The height of the image |
[in] | interlace | String defining the interlace mode |
[in] | buffer | Buffer with data to be written to the dataset |
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.
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.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | dset_name | The name of the dataset to create |
[in] | width | The width of the image |
[in] | height | The height of the image |
[in] | buffer | Buffer with data to be written to the dataset |
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.
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.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | pal_name | The name of the palette |
[in] | pal_dims | An array of the size of the palette dimensions |
[in] | pal_data | Buffer with data to be written to the dataset |
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.
Reads image data from disk.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | dset_name | The name of the dataset to create |
[out] | buffer | Buffer with data to store the image |
H5IMread_image() reads a dataset named dset_name
attached to the file or group specified by the identifier loc_id
.
Detaches a palette from an image.
[in] | loc_id | Location identifier. The identifier may be that of a file or group. |
[in] | image_name | The name of the image dataset |
[in] | pal_name | The name of the palette |
H5IMunlink_palette() detaches a palette from an image specified by image_name
.