Blog Entry
heroku paperclip imagemagick headache
Posted Friday 12/04/09 @ 03:13AM
Tags: rails, ruby, heroku, paperclip, imagemagick
I am posting this little tip in the hope it will save someone a big headache at some point.
If you happen to be using heroku as a hosting solution, and are utilizing imagemagick (Probably with paperclip) Then this might help you out.
Heroku is using an older version of imagemagick, and there are a few features in this version, which do not behave as they are currently documented as behaving. (at least not without some massive googling).
The version of imagemagick heroku is running as of 12/03/2009:
ImageMagick 6.2.4.5
But according to their support they are soon upgrading to:
ImageMagick 6.3.7.9
The issue we had was with the ‘extent’ command.
Extent: Direct Image Size Adjustment
We were using extent to center an image within a transparent padding.
So, come to find out, the current functionality of extent, is a bit different from what it was in v. 6.2.4.5.
And the equivalent in that version is:
-bordercolor transparent -border 50 -gravity center -crop 100×100+0+0 +repage
This will center an image onto a 100×100 transparent background.
and to scale up it’s simply a matter of making the border half of the total size. eg: 100×100 has a border of 50, 300×300 has a border of 150.
annnnnnnndddddddddd Tada!
Comments
Hello Andrea, I'm sorry to say I don't know when they are performing the upgrade. Their support said, they were 'In the process of planning the upgrade', That's pretty helpful, huh? :) I'd shoot them a ticket to see if there has been anymore progress with the upgrade. What is the intended outcome of your crop? To save a cropped area of the image, in the original size of the area or, have the cropped area the same size as the original image ?
When I select an area (100x100) of an image ( 222x317 ratio 0,70 ), have a new saved image with the original ratio ( 100x143 ratio 0,69 ). This image should clarify the process http://xr.com/a9vm (not look at the subject of the image ;o) thanks in advance...
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great post, I will follow you.
Hahhaha.. I'm sorry, I know nothing is funny here, I just laughed at the last part. Liked the way how you presented this information. This will really serve as a great guide for those who are experiencing the same problem as yours. Great job!
I have tested on a LAMP and it didn't work. I don't know why - but it finish without a error-message.
Do You know when they upgrade to version 6.3.7.9? I have a problem with "-crop". I am following the screencast 182 of Rayan Bates. Local works perfectly while on Heroku cropping does not preserve the ratio Crop_command is something like " -crop '#{target.crop_w.to_i}x#{target.crop_h.to_i}+#{target.crop_x.to_i}+#{target.crop_y.to_i}'"... any suggestions?