Rails - Jan 2006 - Determining width and height of image files

I''m trying to figure out how to determine the width and height of
images
that are uploaded through my app. Either from the posted data or the 
file I save to disk. I''ve been searching around for info but no luck; 
I''m completely at a loss. Any suggestions or pointers would be great.

Project background:
The site is an artists portfolio site. The images are thumbnails and 
large pictures of her paintings. Rather then force her type in the width 
and height for every image I''d like to be able to detect those 
programmatically.

- William

-- 
Posted via http://www.ruby-forum.com/.

This will help you out. Just gotta parse out what you need.

http://www.bigbold.com/snippets/tag/rmagick

Google is your friend.

Bob Silva
http://www.railtie.net/
> -----Original Message-----
> From: rails-bounces@lists.rubyonrails.org [mailto:rails-
> bounces@lists.rubyonrails.org] On Behalf Of William LeFevre
> Sent: Saturday, January 28, 2006 11:55 PM
> To: rails@lists.rubyonrails.org
> Subject: [Rails] Determining width and height of image files
> 
> I''m trying to figure out how to determine the width and height of
images
> that are uploaded through my app. Either from the posted data or the
> file I save to disk. I''ve been searching around for info but no
luck;
> I''m completely at a loss. Any suggestions or pointers would be
great.
> 
> Project background:
> The site is an artists portfolio site. The images are thumbnails and
> large pictures of her paintings. Rather then force her type in the width
> and height for every image I''d like to be able to detect those
> programmatically.
> 
> - William
> 
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

That example requires rmagick. Is there a way to do this without extra 
modules?

Thanks for the link. I found it once before, forgot to bookmark it, and 
was never able to find it again. From what I''ve seen, it looks like a 
good site.

-- 
Posted via http://www.ruby-forum.com/.

William LeFevre wrote:
> That example requires rmagick. Is there a way to do this without extra 
> modules?
> 
Not unless you want to write your own code to parse the information out 
of the image files...  It''s not too hard for most common file types,
but
it''d be far easier to get RMagick working, because that''ll
give you a
way in to automatically generating thumbnails from originals, and so on.

-- 
Alex

> Not unless you want to write your own code to parse the information out
> of the image files...  
That''s what I''m after. Right now I don''t need all
image processing
capabilities; I just need the width and height.

-- 
Posted via http://www.ruby-forum.com/.

Try this: http://www.bigbold.com/snippets/posts/show/805

It doesn''t depend on rmagick; it parses the file headers instead.
> 
> 
> > Not unless you want to write your own code to parse the information
out
> > of the image files...  
> 
> That''s what I''m after. Right now I don''t need
all image processing
> capabilities; I just need the width and height.
>

Sweet. That looks perfect. I''ll dig into that tonight.


-- 
Posted via http://www.ruby-forum.com/.

On Jan 29, 2006, at 10:00 AM, William LeFevre wrote:
> That example requires rmagick. Is there a way to do this without extra
> modules?
>
> Thanks for the link. I found it once before, forgot to bookmark it,  
> and
> was never able to find it again. From what I''ve seen, it looks
like a
> good site.
>
> -- 
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

  Try this:

http://www.bigbold.com/snippets/posts/show/805

Cheers-
-Ezra Zygmuntowicz
WebMaster
Yakima Herald-Republic Newspaper
ezra@yakima-herald.com
509-577-7732

Looking at this code, doesn''t it assume a certain
"endian-ness"?


On 1/29/06 5:29 PM, "Ezra Zygmuntowicz" <ezra@yakimaherald.com>
wrote:
> 
> On Jan 29, 2006, at 10:00 AM, William LeFevre wrote:
> 
>> That example requires rmagick. Is there a way to do this without extra
>> modules?
>> 
>> Thanks for the link. I found it once before, forgot to bookmark it,
>> and
>> was never able to find it again. From what I''ve seen, it looks
like a
>> good site.
>> 
>> -- 
>> 
>> _______________________________________________
>> Rails mailing list
>> Rails@lists.rubyonrails.org
>> http://lists.rubyonrails.org/mailman/listinfo/rails
>> 
> 
> 
>   Try this:
> 
> http://www.bigbold.com/snippets/posts/show/805
> 
> Cheers-
> -Ezra Zygmuntowicz
> WebMaster
> Yakima Herald-Republic Newspaper
> ezra@yakima-herald.com
> 509-577-7732
>