# RMagick + ImageMagick issues on OSX **URL:** \ **Category:** ruby-talk\ **Created:** [14 September 2005 22:41 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836 "2005-09-14T22:41:11Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![J-Van](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@J-Van](https://rubytalk.org/u/J-Van)\ **Post date:** [14 September 2005 22:41 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836/1 "2005-09-14T22:41:11Z")
Hi, I compiled and installed ImageMagick from scratch. Seemed to install fine. Also installed RMagick via gems. (all last night) Magick::Image.from\_blob ain't working though. irb(main):001:0\> require 'RMagick' =\> true irb(main):002:0\> Magick::Image.from\_blob(File.read("lodge.jpg")) =\> [] Where can I begin troubleshooting? ---
**Author:** ![Tim\_Hunter](https://avatars.discourse-cdn.com/v4/letter/t/7feea3/32.png) [@Tim\_Hunter](https://rubytalk.org/u/Tim_Hunter)\ **Post date:** [14 September 2005 23:16 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836/2 "2005-09-14T23:16:34Z")
Joe Van Dyk wrote: > Hi, > > I compiled and installed ImageMagick from scratch. Seemed to install > fine. Also installed RMagick via gems. (all last night) > > Magick::Image.from\_blob ain't working though. > > irb(main):001:0\> require 'RMagick' > =\> true > irb(main):002:0\> Magick::Image.from\_blob(File.read("lodge.jpg")) > =\> > > Where can I begin troubleshooting? I get that behavior when I try to read a file that isn't an image. Two things to try: 1. Can ImageMagick display the image? Try   display lodge.jpg 2. Can you simply read the image? Try this:   img = Magick::Image.read('lodge.jpg')   img.display ---
**Author:** ![J-Van](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@J-Van](https://rubytalk.org/u/J-Van)\ **Post date:** [15 September 2005 03:32 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836/3 "2005-09-15T03:32:45Z")
irb(main):002:0\> img = Magick::Image.read('lodge.jpg') Magick::ImageMagickError: no decode delegate for this image format `lodge.jpg':         from (irb):2:in `read'         from (irb):2 I assume that means that imagemagick wasn't compiled with enough image support, right? > **路路路** > > On 9/14/05, Timothy Hunter \ wrote: > > > Joe Van Dyk wrote: > > \> Hi, > > \> > > \> I compiled and installed ImageMagick from scratch. Seemed to install > > \> fine. Also installed RMagick via gems. (all last night) > > \> > > \> Magick::Image.from\_blob ain't working though. > > \> > > \> > > \> irb(main):001:0\> require 'RMagick' > > \> =\> true > > \> irb(main):002:0\> Magick::Image.from\_blob(File.read("lodge.jpg")) > > \> =\> > > \> > > \> Where can I begin troubleshooting? > > \> > > \> > > > > I get that behavior when I try to read a file that isn't an image. Two > > things to try: > > > > 1. Can ImageMagick display the image? Try > >         display lodge.jpg > > > > 2. Can you simply read the image? Try this: > >         img = Magick::Image.read('lodge.jpg') > >         img.display ---
**Author:** ![Ara.T.Howard6](https://avatars.discourse-cdn.com/v4/letter/a/958977/32.png) [@Ara.T.Howard6](https://rubytalk.org/u/Ara.T.Howard6)\ **Post date:** [15 September 2005 03:56 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836/4 "2005-09-15T03:56:26Z")
don't suppose you want to hear that i spent all day compiling it for redhat enterprise boxes do you? 馃槈 (those of you using rpms out there should know they are badly broken). there are only about 3700 image delegates to track down and compile - on the bright side they all google right up and compile easily. good luck. -a > **路路路** > > On Thu, 15 Sep 2005, Joe Van Dyk wrote: > > > irb(main):002:0\> img = Magick::Image.read('lodge.jpg') > > Magick::ImageMagickError: no decode delegate for this image format `lodge.jpg': > >        from (irb):2:in `read' > >        from (irb):2 > > > > I assume that means that imagemagick wasn't compiled with enough image > > support, right? > > # -- > > > email :: ara [dot] t [dot] howard [at] noaa [dot] gov > > phone :: 303.497.6469 > > Your life dwells amoung the causes of death > > Like a lamp standing in a strong breeze. --Nagarjuna > > =============================================================================== ---
**Author:** ![Tim\_Hunter](https://avatars.discourse-cdn.com/v4/letter/t/7feea3/32.png) [@Tim\_Hunter](https://rubytalk.org/u/Tim_Hunter)\ **Post date:** [15 September 2005 11:06 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836/5 "2005-09-15T11:06:34Z")
Joe Van Dyk wrote: > irb(main):002:0\> img = Magick::Image.read('lodge.jpg') > Magick::ImageMagickError: no decode delegate for this image format `lodge.jpg': from (irb):2:in `read' >         from (irb):2 > > I assume that means that imagemagick wasn't compiled with enough image > support, right? In the README-OSX.txt file that comes with RMagick I outline a process for installing RMagick that gets the ImageMagick delegate libraries via Darwinports. It also shows how to determine if ImageMagick is configured the way you need it. Why don't you give that process a try and let me know how it turns out? ---
**Author:** ![J-Van](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@J-Van](https://rubytalk.org/u/J-Van)\ **Post date:** [15 September 2005 15:10 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836/6 "2005-09-15T15:10:33Z")
Actually, all I needed to do was: sudo port install ghostscript sudo port install imagemagick sudo gem install rmagick and it seems to work fine. I'm getting some font errors when building the examples. RMagick: unable to read font `helvetica'. RMagick: unable to read font `Verdana'. But I don't think I have any Microsoft fonts installed... > **路路路** > > On 9/15/05, Timothy Hunter \ wrote: > > > Joe Van Dyk wrote: > > \> irb(main):002:0\> img = Magick::Image.read('lodge.jpg') > > \> Magick::ImageMagickError: no decode delegate for this image format `lodge.jpg': > > \> from (irb):2:in `read' > > \> from (irb):2 > > \> > > \> I assume that means that imagemagick wasn't compiled with enough image > > \> support, right? > > > > In the README-OSX.txt file that comes with RMagick I outline a process > > for installing RMagick that gets the ImageMagick delegate libraries via > > Darwinports. It also shows how to determine if ImageMagick is configured > > the way you need it. Why don't you give that process a try and let me > > know how it turns out? ---
**Author:** ![Tim\_Hunter1](https://avatars.discourse-cdn.com/v4/letter/t/3ec8ea/32.png) [@Tim\_Hunter1](https://rubytalk.org/u/Tim_Hunter1)\ **Post date:** [15 September 2005 16:36 UTC](https://rubytalk.org/t/rmagick-imagemagick-issues-on-osx/20836/7 "2005-09-15T16:36:34Z")
ImageMagick doesn't look up fonts dynamically. It has a couple of fixed sets it knows how to use. At config time you (or whoever is configuring it) tell IM which set(s) of fonts to use and where to find them. Whoever made the port did the configuring, so that version of ImageMagick is configured for them, not for you. This is one of the reasons I recommend installing from source. The short-cuts always seem to take longer... Now that you've got all the dependent libraries installed it should be fairly easy to uninstall ImageMagick and re-install from source. It takes about 5-10 minutes on my Powerbook. Or I can try to coach you through manually editing the font config files. If you decide to go with the first option check out RMagick's README file, 'cause it's got lots of advice on how to configure ImageMagick.