decode jpg header

tlynch001 has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: decode jpg header by dws (Chancellor) on Feb 20, 2001 at 04:07 UTC
Image::Size will give you the dimensions of a jpg. That's a start.	[reply]
Re: Re: decode jpg header by tadman (Prior) on Feb 20, 2001 at 10:42 UTC
Image::Size, I have to admit, is very slick. I was porting an old program of mine that unpacked GIF and JPG, but decided to check CPAN just for the heck of it. Sure enough, there was this gem. For something so simple in concept, it is implemented quite thorougly. It will parse many different formats, and it returns the information in a highly dynamic way, so you can literally drop the results into CGI.pm for your <IMG> tag. Very interesting. From the docs: `$r->print($Q->img({-src => $imgpath, attr_imgsize($r->lookup_uri($imgpath)->filename +) }));` [download]	[reply] [d/l]
(ichimunki) re: decode jpg header by ichimunki (Priest) on Feb 20, 2001 at 04:15 UTC
Searching CPAN for "image" turns up Image::Info	[reply]
Re: decode jpg header by magnus (Pilgrim) on Feb 20, 2001 at 15:25 UTC
seems after looking at both `Image:Size` and `Image::Info` you should be able to get what you need... `Image::Info` gives you more information, though the sizing in returned differently, it seems... be careful, as there are slight differences in what formats are supported between them (e.g.: `Image::Info` doesn't seem to support TIF, tho it does support ASCII)... good luck, and very cool find ichimunki... magnus	[reply] [d/l] [select]
Re: decode jpg header by strredwolf (Chaplain) on Feb 22, 2001 at 09:36 UTC
Even though Image::Size can do the trick, if you're also doing some processing, ImageMagick's PerlMagick can also do it too. I use that for comic strip compiler. -- $Stalag99{"URL"}="http://stalag99.keenspace.com";	[reply]