1Panotools::Photos(3)  User Contributed Perl Documentation Panotools::Photos(3)
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NAME

6       Panotools::Photos - Photo sets
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SYNOPSIS

9       Query sets of photos
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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
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USAGE

17       Create a new object like so:
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19         my $photos = new Panotools::Photos;
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21       Alternatively supply some filenames:
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23         my $photos = new Panotools::Photos ('DSC_0001.JPG', 'DSC_0002.JPG');
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25       Paths
26           Add to or get the list of image filenames:
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28             $photos->Paths ('DSC_0003.JPG', 'DSC_0004.JPG');
29             my @paths = $photos->Paths;
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31       Stub
32           Construct a stub filename from the names of the first and last
33           images in the list.
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35             my $stub = $photos->Stub;
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37           e.g. DSC_0001.JPG DSC_0002.JPG DSC_0003.JPG -> DSC_0001-DSC_0003
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39       Bracketed
40           Query to discover if this is a likely bracketed set.  i.e. is the
41           total number of photos divisible by the number of different
42           exposures:
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44             &do_stuff if ($photos->Bracketed);
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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.
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50             &do_stuff if ($photos->Layered);
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52           By default the threshold is 4, e.g. exposures varying between 2 and
53           1/2 seconds indicate layers.  Vary this threshold like so:
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55             &do_stuff if ($photos->Layered (2));
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57       Speeds
58           Get a list of exposure times sorted with longest exposure first
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60             @speeds = @{$photos->Speeds};
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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:
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69             my @sets = $photos->SplitInterval (15);
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71           Sets with an average interval greater than 4x this variation are
72           not considered panoramas at all and discarded.
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74       AverageInterval
75           Get the average time between shots:
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77             $average = $photos->AverageInterval;
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79       FOV FocalLength Rotation
80           Get the Angle of View in degrees of the first photo:
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82             $photos->FOV;
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84           ..or any other photo (-1 is last):
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86             $photos->FOV (123);
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88           Returns undef if the FOV can't be calculated.
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90       Eev Get an EV value for a photo, this will be guessed from partial EXIF
91           data:
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93             $photos->Eev ($index);
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95       AverageRGB
96           Find the mean average colour balance for all photos:
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98             ($red, $green, $blue) = $photos->AverageRGB;
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102perl v5.30.0                      2019-07-26              Panotools::Photos(3)