This plugin allows you to display all images from selected galleries created using the NextGen Gallery plugin. Images are displayed in full size.
Use shortcode [nggimages id=gallery_id] in your post/page. 
More options on “Installation” tab.

NGGImages

This plugin allows you to display all images from selected galleries created using the NextGen Gallery plugin.

sojournings

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NextGEN Resize is plugin that resizes the your pictures on the fly depending on the options set using the screen. This plugin requires <a href="http://alexrabe.de/" rel="nofollow ugc">Alex Rabe’s</a> – <a href="https://wordpress.org/extend/plugins/nextgen-gallery/" rel="ugc">NextGEN Gallery Plugin</a>, without which the NextGEN Resize plugin simply will not work.
NextGEN Resize, says it all 🙂 – Every time you upload any and all images, it would resize them on the fly based on the options set on the settings page.
To report bugs/give feedback, please visit and comment on the <a href="http://designerfoo.com/nextgen-resize-wordpress-plugin-to-resize-nextgen-gallery-images" rel="nofollow ugc">wordpress plugin support</a> page on the <a href="http://designerfoo.com/" rel="nofollow ugc">website</a>.
Tested with
NextGEN Gallery 1.4.x and WP 2.8.x / 2.9
Features
<ol>
<li>Easy/Simple to use.</li>
<li>Resize images, reduce their size and dimensions on the fly, while using NextGEN</li>
<li>Resize images in a gallery on a click of a button! </li>
<li>Flexible settings, set dimentions, etc.</li>
<li>Easy to switch on and off.</li>
</ol>
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Please note
You will require a working installation of <a href="http://alexrabe.de/" rel="nofollow ugc">Alex Rabe’s</a> – <a href="https://wordpress.org/extend/plugins/nextgen-gallery/" rel="ugc">NextGEN Gallery Plugin</a>, without which the NextGEN Resize plugin simply will not work.

NextGEN – Resize

NextGEN Resize is plugin that resizes your pictures, photos while they upload, on the fly depending on the options set using the NextGEN Resize contro …

NGGImages vs NextGEN – Resize