arc / image-jpeg-size Goto Github PK
View Code? Open in Web Editor NEWPerl 5 library for finding JPEG image sizes
Perl 5 library for finding JPEG image sizes
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 0ร0 pixels. "quiet" Suppress the error entirely. If the error is non-recoverable, image processing stops immediately, and its dimensions are reported as 0ร0 pixels. AUTHOR Aaron Crane, <[email protected]> The initial development of this module was sponsored by Science Photo Library <https://www.sciencephoto.com/>. COPYRIGHT Copyright 2017 Aaron Crane. LICENSE This library is free software and may be distributed under the same terms as perl itself. See <http://dev.perl.org/licenses/>.
A declarative, efficient, and flexible JavaScript library for building user interfaces.
๐ Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. ๐๐๐
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google โค๏ธ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.