I see that the SVN version of the excellent file_column plug-in can create thumbnails using the url_for_image_column helper. This uses Rmagick to create the thumbnail... Quick question... Let''s say the file is a TIFF image - can the helper create a JPG version of the thumbnail for display in the browser? Curious if the plug-in can handle that transform with some creative use of the options. Any ideas before I hack up the plug-in code myself?
I believe it can using Rmagick. If you read the rdoc documentation for file_column you can interact with Magick directly. I don''t have it in front of me right now so I can''t be more help :(. <rant>A good, integrated and well-documented image manipulation library is one of a few things I miss from my PHP days.</rant> Nicholas P. Mueller HH wrote:> I see that the SVN version of the excellent file_column plug-in can create > thumbnails using the url_for_image_column helper. > > This uses Rmagick to create the thumbnail... Quick question... > > Let''s say the file is a TIFF image - can the helper create a JPG version of > the thumbnail for display in the browser? > > Curious if the plug-in can handle that transform with some creative use of > the options. Any ideas before I hack up the plug-in code myself? > > > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails >
HH wrote:> I see that the SVN version of the excellent file_column plug-in can > create > thumbnails using the url_for_image_column helper. > > This uses Rmagick to create the thumbnail... Quick question... > > Let''s say the file is a TIFF image - can the helper create a JPG version > of > the thumbnail for display in the browser? > > Curious if the plug-in can handle that transform with some creative use > of > the options. Any ideas before I hack up the plug-in code myself?Yes, you can do that. Actually, you shouldn''t have to do much hacking -- RMagick (or rather, ImageMagick/GraphicsMagick behind it) can determine what kind of image you feed it. Here''s the code I use to convert an uploaded photo to a thumbnail that''s 96 pixels in its longest dimension: def write_photo_file(photo_data) img = Image.from_blob(photo_data) img.first.strip!.change_geometry("96x96") { |cols, rows, img| img.resize!(cols, rows) } img.write(User.photo_file_name_for(self.id)) { self.quality = 50 } end Not much to it.... --Al Evans -- Posted via http://www.ruby-forum.com/.