When uploading without resizing then it is fine. :)

I have updated the latest RMagick but still have the same problem, my server is Centos Linux.

Would anyone know the answer to this?

RMagick is capable of rotating jpegs in a lossless way, but can only do so for images whose height and width are multiples of 16.

This is why my original images were being rotated losslessly, but the thumbnails were rotated in lossy way. (And it really is noticeable after surprisingly few rotations)

So I changed:

:thumbnails => { :thumb => ‘100×100>’, :reduced => ‘500×500′ }

to:

:thumbnails => { :thumb => ‘128×128>’, :reduced => ‘512×512′ }

in my model. Hope that helps someone :-)

I’m following your approach except that I’m using the attachment_fu plugin and storing images in the file system.

So far I have got up to:

def edit
@logo = Logo.find(params[:id])
image = @logo.public_filename
image = Magick::ImageList.new(image)
end

But I get an error saying:

Magick::ImageMagickError in MainController#edit

unable to open image `/logos/0000/0013/s.jpg’: No such file or directory

Any suggestions? Would appreciate any help.

Cheers

I want to do the following -

1. Upload an image,
2. Create an thumbnail of that image.
3. Save the original image in a folder.
4. Save the thumbnail of the image and the path of the original image in a database table.
5. Display the thumbnail and the original image.

How I can do all these ? (using Ruby on Rails)

class Photo

require 'RMagick'
include Magick
def chord_chart
fill = GradientFill.new(100, 100, 100, 100,"yellow","red")
img = Image.new(200, 200, fill)
img.format = "GIF"
img_content = img.to_blob
render :text => img_content, :status => 200, :content_type => 'image/gif'
end


This creates a simple gradient filled image in the browser. Woo! Now, to make the image display something useful…

I haven’t seen anywhere that I can control the response headers or response MIME type. I need to generate an image on-the-fly (possibly with caching, but I can tackle that later). I have RMagick installed, and can create my Image object. How do I get it on the response stream? There’s a ‘to_blob’ method on ‘Image’ that looks useful.

Any suggestions are appreciated :)

The other day I ran into a problem when I tried to upload an animated gif, in both the thumb and medium versions of the gif only the first frames are saved.

This is the code on the model that I use to create the versions:

file_column :image, :magick => { :versions => {“tiny” => “75×75″, “medium” => “550×400″}}

Do you happen to know how I could get around this?