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In my content type, I've got an image uploader. That image then gets processed by an Image Style that scales the image. I want to produce multiple scaled sizes of that image though. So essentially, I need to assign multiple Image Styles to that one image upload. In the UI, I can only assign one. This is Drupal 7, by the way.

So, for example: I start by uploading an 800x600 image and I've applied an Image Style to output it at 400x300. Now I want to apply another Image Style to get a 200x150 version. And so on...

Surely, I'm missing something here! Seems like a straightforward request. Thanks in advance!

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    What are you trying to do? Image derivatives are created on-demand when they are requested, so it possible to do anything you want, but we need some more information on what that is. – mpdonadio Mar 4 '13 at 21:08
  • For example: I start by uploading an 800x600 image and I've applied an Image Style to output it at 400x300. Now I want to apply another Image Style to get a 200x150 version. (appended to question) But I'm intrigued by your comment of "Image derivatives are created on-demand when they are requested". How do I request them? Specifically, how in a content template? – Sam Mar 4 '13 at 21:11
  • Hang on... I might be looking for something like this function: image_style_url($style_name, $path) api.drupal.org/api/drupal/modules!image!image.module/function/… – Sam Mar 4 '13 at 21:24
  • Confirmed! @MPD Thanks! I Googled for "drupal request image derivative" and found the answer immediately. – Sam Mar 4 '13 at 21:34
  • Hi, Sam. Can you please write more details about using the image_style_url() function? Are you using any specific hook? A snippet of your code will be very useful. – user2519032 Jul 6 '14 at 18:40
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This is the function that I was looking for:

image_style_url($style_name, $path)

More info here.

(Should have done a little more digging via Google before I asked!)

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drush image-flush

is a very useful command to regenerate all images associated to any defined Image Style. Use

drush image-flush -h

for details.

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