rails image crop

Center focus and Crop
<%= image_tag @user.header.variant(combine_options: { gravity: 'Center', crop: '1280x300+0+0' }) %>
Resize
<%= image_tag @user.header.variant(resize: '128x128') %>
<%= image_tag @user.header.variant(combine_options: { gravity: 'Center', crop: '1280x300+0+0' }) %>
<%= image_tag @user.header.variant(resize: '128x128') %>