1Panotools::Photos(3)  User Contributed Perl Documentation Panotools::Photos(3)
2
3
4

NAME

6       Panotools::Photos - Photo sets
7

SYNOPSIS

9       Query sets of photos
10

DESCRIPTION

12       A collection of photos has possibilities, it could be one or more
13       panoramas or a bracketed set.  This module provides some methods for
14       describing groups of photos based on available metadata
15

USAGE

17       Create a new object like so:
18
19         my $photos = new Panotools::Photos;
20
21       Alternatively supply some filenames:
22
23         my $photos = new Panotools::Photos ('DSC_0001.JPG', 'DSC_0002.JPG');
24
25       Paths
26           Add to or get the list of image filenames:
27
28             $photos->Paths ('DSC_0003.JPG', 'DSC_0004.JPG');
29             my @paths = $photos->Paths;
30
31       Stub
32           Construct a stub filename from the names of the first and last
33           images in the list.
34
35             my $stub = $photos->Stub;
36
37           e.g. DSC_0001.JPG DSC_0002.JPG DSC_0003.JPG -> DSC_0001-DSC_0003
38
39       Bracketed
40           Query to discover if this is a likely bracketed set.  i.e. is the
41           total number of photos divisible by the number of different
42           exposures:
43
44             &do_stuff if ($photos->Bracketed);
45
46       Layered
47           Query to discover if this is a layered set, i.e. there is a large
48           exposure difference in the set, but it isn't bracketed.
49
50             &do_stuff if ($photos->Layered);
51
52           By default the threshold is 4, e.g. exposures varying between 2 and
53           1/2 seconds indicate layers.  Vary this threshold like so:
54
55             &do_stuff if ($photos->Layered (2));
56
57       Speeds
58           Get a list of exposure times sorted with longest exposure first
59
60             @speeds = @{$photos->Speeds};
61
62       SplitInterval
63           Given a set of photos, split it into a one or more sets by looking
64           at the variation of time interval between shots.  e.g. typically
65           the interval between shots in a panorama varies by less than 15
66           seconds.  A variation greater than that indicates the start of the
67           next panorama:
68
69             my @sets = $photos->SplitInterval (15);
70
71           Sets with an average interval greater than 4x this variation are
72           not considered panoramas at all and discarded.
73
74       AverageInterval
75           Get the average time between shots:
76
77             $average = $photos->AverageInterval;
78
79       FOV FocalLength Rotation
80           Get the Angle of View in degrees of the first photo:
81
82             $photos->FOV;
83
84           ..or any other photo (-1 is last):
85
86             $photos->FOV (123);
87
88           Returns undef if the FOV can't be calculated.
89
90       Eev Get an EV value for a photo, this will be guessed from partial EXIF
91           data:
92
93             $photos->Eev ($index);
94
95       AverageRGB
96           Find the mean average colour balance for all photos:
97
98             ($red, $green, $blue) = $photos->AverageRGB;
99
100
101
102perl v5.32.1                      2021-01-27              Panotools::Photos(3)