Image data unit handlers

Detailed Description

Read and write image HDUs.

There are two main classes to perform image HDU I/Os:

• ImageHdu is dedicated to HDU-level tasks; It roughly extends Hdu by providing a raster() method, to access the data unit, as well as a few shortcuts like readRaster().
• ImageRaster focuses on services to read and write the data unit.

In addition, FileMemRegions is a helper class to specify which regions to consider, both in the Fits file and in the Raster object, when reading or writing the data unit region-wise.

For example, here is how to write the 2D region of a raster spanning from (8, 16) to (32, 48) into the HDU at position (144, 36):

hdu.raster().writeRegion<2>({ { 144, 36 }, { { 8, 16 }, { 32, 48 } } }, data);

where:

• hdu is an ImageHdu
• raster() returns an ImageRaster
• The FileMemRegions is built inline through brace-enclosed initializer lists
• data is a Raster

See also

Hdu

Classes
class	Euclid::Fits::FileMemRegions< n >
	Mapping between an in-file (Fits image data unit) region and an in-memory (raster) region for reading and writing image regions. More...
class	Euclid::Fits::ImageHdu
	Image HDU reader-writer. More...
class	Euclid::Fits::ImageRaster
	Reader-writer for the image data unit. More...

Functions
template<long n>
FileMemRegions< n >	Euclid::Fits::makeMemRegion (const Region< n > &memoryRegion)
	Create a FileMemRegions with in-file position at origin.
template<long n>
FileMemRegions< n >	Euclid::Fits::makeMemRegion (const Position< n > &memoryPosition)
	Create a FileMemRegions with whole in-file region.