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Is there any way out to create additional thumbnails of custom size in nextgen gallery while uploading images? For example I would like to create 3 thumbnails of size 25*30, 100*50, and 400*350 to display them in certain custom pages.Or can i add custom code to resize when image upload is triggered and if so where?

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closed as off-topic by Howdy_McGee, TheDeadMedic, Pieter Goosen, Mayeenul Islam, ialocin May 3 '15 at 14:53

This question appears to be off-topic. The users who voted to close gave this specific reason:

If this question can be reworded to fit the rules in the help center, please edit the question.

Make shure your theme function have

add_theme_support( 'post-thumbnails' );

to add a custom image size use

add_image_size( 'thumb-one', 25, 30 );

for more details have a looh here

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but how will this thumbnail get generated while uploading while nextgen gallery ? – user7282 Mar 7 '13 at 11:10

If you want to write a custom function to re-size the thumbnails you need to have a look at gd.thumbnail.inc.php in the lib folder of the plugin. This is where the thumbnails are generated.

Alternatively you can create custom a template for displaying different thumbnail sizes.

If you have a look in the view folder anyone of those files will give you a clue as to how to create a template for the plugin.

Once you create a template you can display it with a shortcode like [ nggallery id=X template=your_template ]

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