Image creation

ruby-talk
1

Hi...

Im pondering how to best create an image from a Ruby script.
1) a x*y size String comes to mind
   easy manipulation
2) dump it out to a .pgm file
3) call pgm2jpg, pgm2png or something like that
4) serve link to file

For small images a "keep in memory" and call libjpg directly approach
comes to mind, for large images maybe via mmap?

Anyone ever did such things, pointer to example code?

thanks,
Martin

2

Martin Pirker wrote:

Hi...

Im pondering how to best create an image from a Ruby script.
1) a x*y size String comes to mind
   easy manipulation
2) dump it out to a .pgm file
3) call pgm2jpg, pgm2png or something like that
4) serve link to file

For small images a "keep in memory" and call libjpg directly approach
comes to mind, for large images maybe via mmap?

Anyone ever did such things, pointer to example code?

When I did some image manipulation I used RMagick/ImageMagick.
http://rmagick.rubyforge.org/index.html
http://www.imagemagick.org/index.html?

I had some very plain text files, with y lines and x characters in each line. The chars where limited to single letters indicating red, blue, green, white, black etc. colours.

Stephan

3

Imagemagick has a ruby binding and allows to do all kind of stuff.

See: http://rmagick.rubyforge.org/

Regards,

Brian

···

On Wed, 17 Nov 2004 00:33:17 +0900 Martin Pirker <crf@sbox.tu-graz.ac.at> wrote:

Hi...

Im pondering how to best create an image from a Ruby script.
1) a x*y size String comes to mind
   easy manipulation
2) dump it out to a .pgm file
3) call pgm2jpg, pgm2png or something like that
4) serve link to file

For small images a "keep in memory" and call libjpg directly approach
comes to mind, for large images maybe via mmap?

Anyone ever did such things, pointer to example code?

thanks,
Martin

--
Brian Schröder
http://www.brian-schroeder.de/

4

The RMagick doc is online at RMagick 1.15.0 User's Guide and Reference

···

On 16 Nov 2004 15:32:40 GMT, Martin Pirker <crf@sbox.tu-graz.ac.at> wrote:

Anyone ever did such things, pointer to example code?

5

Be careful, the latest version of RMagick does not work with the
latest version of ImageMagick. Try to get imagemagick 6.0.*

···

On Wed, 17 Nov 2004 04:23:18 +0900, Tim Hunter <sastph@sas.com> wrote:

On 16 Nov 2004 15:32:40 GMT, Martin Pirker <crf@sbox.tu-graz.ac.at> > wrote:

>
>Anyone ever did such things, pointer to example code?
>

The RMagick doc is online at RMagick 1.15.0 User's Guide and Reference

--
Tobi
http://blog.leetsoft.com

6

Correct. If you want to run with IM 6.1.3 or later, wait for RMagick
1.6.1, which will be available on RubyForge tonight or tomorrow.

···

On Wed, 17 Nov 2004 05:08:18 +0900, Tobias Luetke <tobias.luetke@gmail.com> wrote:

Be careful, the latest version of RMagick does not work with the
latest version of ImageMagick. Try to get imagemagick 6.0.*

7

Thanks a lot tim, rmagick rocks

···

On Wed, 17 Nov 2004 06:38:17 +0900, Tim Hunter <sastph@sas.com> wrote:

On Wed, 17 Nov 2004 05:08:18 +0900, Tobias Luetke > <tobias.luetke@gmail.com> wrote:

>Be careful, the latest version of RMagick does not work with the
>latest version of ImageMagick. Try to get imagemagick 6.0.*
>
Correct. If you want to run with IM 6.1.3 or later, wait for RMagick
1.6.1, which will be available on RubyForge tonight or tomorrow.

--
Tobi
http://blog.leetsoft.com

8

Tobias Luetke wrote:

Thanks a lot tim, rmagick rocks

Glad you like it!

9

is there a ruby interface to ImageMagicks
or to the SDL or GDL libraries?

Klaus Schilling

10

As far as I know, there's rmagick (ImageMagick binding) and RuDL (I
think?) -- there are bindings to both ImageMagick and SDL, though.
Check the RAA.

-austin

···

On Fri, 19 Nov 2004 03:51:06 +0900, klaus schilling <510046470588-0001@t-online.de> wrote:

is there a ruby interface to ImageMagicks
or to the SDL or GDL libraries?

--
Austin Ziegler * halostatue@gmail.com
               * Alternate: austin@halostatue.ca

11

klaus schilling wrote:

is there a ruby interface to ImageMagicks
or to the SDL or GDL libraries?

As I posted earlier in the thread, there is http://rmagick.rubyforge.org/index.html

Happy rubying

Stephan

12

klaus schilling ha scritto:

is there a ruby interface to ImageMagicks
or to the SDL or GDL libraries?

RUDL and ruby/sdl are bindings to SDL.
rmagick for ImageMagick
I think GDL means the GD library for graphs/images, there are bindings for that, too.
Looking on RAA (raa.ruby-lang.org ) should provide you links to get 'em