Utilities

Common

colour_hdri

vivification()	Implements supports for vivification of the underlying dict like data-structure, magical!
vivified_to_dict(vivified)	Converts given vivified data-structure to dictionary.
path_exists(path)	Returns if given path exists.
filter_files(directory, extensions)	Filters given directory for files matching given extensions.

EXIF Data Manipulation

colour_hdri

EXIF_EXECUTABLE	Command line exif manipulation application, usually Phil Harvey’s ExifTool.
ExifTag	Hunt colour appearance model induction factors.
parse_exif_string(exif_tag)	Parses given exif tag assuming it is a string and return its value.
parse_exif_numeric(exif_tag[, dtype])	Parses given exif tag assuming it is a numeric type and return its value.
parse_exif_fraction(exif_tag[, dtype])	Parses given exif tag assuming it is a fraction and return its value.
parse_exif_array(exif_tag[, dtype, shape])	Parses given exif tag assuming it is an array and return its value.
parse_exif_data(data)	Parses given exif data output from exiftool.
read_exif_tags(image)	Returns given image exif image tags.
copy_exif_tags(source, target)	Copies given source image file exif tag to given image target.
update_exif_tags(images)	Updates given images siblings images pairs exif tags.
delete_exif_tags(image)	Deletes all given image exif tags.
read_exif_tag(image, tag)	Returns given image exif tag value.
write_exif_tag(image, tag, value)	Sets given image exif tag value.

Image Exposure Value Computation

colour_hdri

exposure_value(f_number, exposure_time, iso)	Computes the average illuminance in \(Lux\) from given image F-Number \(N\), Exposure Time \(t\) and ISO speed \(S\) and reflected light calibration constant \(k\).
adjust_exposure(a, EV)	Adjusts given array exposure using given \(EV\) exposure value.
average_luminance(f_number, exposure_time, iso)	Computes the average luminance in \(cd\cdot m^{-2}\) from given image F-Number \(N\), Exposure Time \(t\), ISO speed \(S\) and reflected light calibration constant \(k\).

Image Data & Metadata Utilities

colour_hdri

Metadata	Defines the base object for storing exif metadata relevant to HDRI / radiance image generation.
Image([path, data, metadata])	Defines the base object for storing an image along its path, pixel data and metadata needed for HDRI / radiance images generation.
ImageStack()	Defines a convenient stack storing a sequence of images for HDRI / radiance images generation.