NAME Image::JPEG::Size - find the size of JPEG images SYNOPSIS use Image::JPEG::Size; my $jpeg_sizer = Image::JPEG::Size->new; my ($width, $height) = $jpeg_sizer->file_dimensions($filename); DESCRIPTION This module uses libjpeg to rapidly determine the size of one or more JPEG images. CONSTRUCTOR First create an instance of the class: my $jpeg_sizer = Image::JPEG::Size->new; The constructor initialises internal libjpeg structures; if that fails, an exception is thrown. The constructor takes attributes as either a hash reference or a listified hash. Unknown attributes are ignored. The following attributes are understood: "error" Specifies the action to take on encountering a non-recoverable error in an image; see "ERROR HANDLING". Defaults to "fatal". "warning" Specifies the action to take on encountering a recoverable error in an image; see "ERROR HANDLING". Defaults to "warn". METHODS "file_dimensions" You can repeatedly call "file_dimensions" in list context to find the width and height of your JPEG images: my ($width, $height) = $jpeg_sizer->file_dimensions($filename); For now, the JPEG images must be supplied as a filename. "file_dimensions_hash" In some cases, you may prefer to get the image dimensions as a hash. The "file_dimensions_hash" takes a single filename argument, and returns a listified hash with keys "width" and "height". ERROR HANDLING By default, recoverable errors in the image are reported using Perl's warning mechanism, and non-recoverable errors cause an exception to be thrown. However, this behaviour can be changed when creating an Image::JPEG::Size instance. The options are: "fatal" Throw an exception with information about the error, and stop processing this image immediately. "warn" Emit a Perl warning with information about the error. If the error is non-recoverable, image processing stops immediately, and its dimensions are reported as 0×0 pixels. "quiet" Suppress the error entirely. If the error is non-recoverable, image processing stops immediately, and its dimensions are reported as 0×0 pixels. AUTHOR Aaron Crane, The initial development of this module was sponsored by Science Photo Library . COPYRIGHT Copyright 2017 Aaron Crane. LICENSE This library is free software and may be distributed under the same terms as perl itself. See .