Images not showing for deployed app in Heroku

If your images are part of your asset pipeline (I.E assets/images), you should be able to access them relatively simply with Heroku, especially if you're using image_tag to do this (rather than css)

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Precompile

Since Heroku relies on your assets being static (precompiled), I would make sure the assets are precompiled on the system, and that you're referencing them correctly:

#cmd $ heroku run rake assets:precompile 

This will precompile the assets on Heroku's system (which should have been done anyway), ensuring your app should be able to access the files correctly. This is the first thing to test, as it's often the case the files will remain non-compiled, preventing Heroku from reading them

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Images

In reference to your images, you need to know from the asset pipeline that calling image_tag "your_image.png should automatically call assets/images, vendor/assets/images and public/assets/images to pull the correct file

If this works in local, it means your paths are okay. If it does not work in local, it means your paths are incorrect, and the issue will be with your code.

You should provide a link to your Heroku app and show us the HTML / erb files you're using

If your images are indeed in that folder then you can use this method here How to reference images in CSS within Rails 4

But if your uploading images into your Rails app via Carrierwave then you need to use an external image hosting provider such as Cloudinary. This is because the Heroku environment is refreshed each git push so any files on the server that were uploaded, since they're not on the client git side, are removed.

You can run heroku run bash to look around your directories on Heroku to verify if the image is there.

EDIT

In regular views you can access images in the public/assets/images directory like this:

<%= image_tag "rails.png" %> 

Source: http://guides.rubyonrails.org/asset_pipeline.html#coding-links-to-assets