Like most things in web development there are 100 ways to slice that pie - so this answer is by no means all encompassing of all ways to do so.

Depending on what your objectives are I would recommend one of two ways:
1. Use the built in WP gallery feature tied to the WP core. No extra code and thus you couldnt get any lighter than that. It already resizes the images to different sizes. To access simply goto "insert media" and look in the upper left hand sidebar for the gallery option, select your images, determine size, press insert. If you want to customize the wp core gallery functionality to show attributions or something similar a good wp coder could knock it out in 30 min or less.
2. If you want a lot of features and customizations an display and interaction I would recommend just getting Revolution Slider. It has more features than you could ever need and it can pull images into galleries OR it can pull posts in from WP and use the featured image, title, and any other custom field you have into the slider.

There is a lot more that could be said but that is a quick - to the point - response.

Cheers!

Hi!
You can try:
- Imsanity
- Bulk Resize Media
- Hammy
- Lazy Load
- CW Image Optimizer
Hope this will help!

The absolute simplest way you could do this is with something like Thrive Content Builder - http://bit.ly/20Rnhn8 - and their templating system. I actually have a content site that I run that makes decent use of these image list type of posts.

Creating the base template is pretty simple - I just created a template once for posts of this type and whenever I want to create a new image list post, all I have to do is load that template up and fill in the images, sources, and content.

Hope that helps!

The most useful aspect of alt and title is that they allow you to add text-based information to an element on your website that would otherwise be invisible to search engines. You will have to add that information yourself. Your website might even rank better if it is image heavy. Jpg is a parsable bit of text, and there is a chance that some search engines would take it into account. Because this is so easy, adding the meta attributes is often overlooked and regarded as a hassle. Once done, all you need to do is insert the image, and the correct HTML tag will be plopped in by WordPress automatically. By taking an extra minute, you will have added a sizable bit of text to your image, making it SEO-friendly and in turn making your website that much more informative. Adding an image size now will not create new thumbnails of your existing images. I can personally vouch for AJAX Thumbnail Rebuild, which goes through all your images and regenerates the selected sizes for you. A featured image can capture the message of a post. Featured images have been built into WordPress since version 2.9, so you do not need any special plug-ins. If you are using the new default WordPress theme, then featured images are already enabled. To enable them, just open your theme’s functions. The first line of code tells WordPress to enable featured images, while the second sets the default size for featured thumbnails. You will need to edit the code for the loop in your theme’s files, which is usually found in index. To include a specific image, you will need to know its attachment ID. You can find that by going to the “Media” section of the WordPress admin area, finding the image you need, hovering over it, and reading the target from the URL or status bar.
First, open your theme’s functions. This removes the gallery short code function that WordPress uses to display galleries and replaces it with our own function, called my own gallery short code. The code below is almost the same as the default, but we are adding a line to exclude our featured image. Paste the code below into the functions. In my opinion, attachment pages are the single best tool for creating richer, more informative image-driven websites. They enable you to create separate pages for each media item you have, affording you considerably more power in managing them. Attachment pages exist in WordPress by default, but people seem to rarely link to them. If your theme does not have an attachment. If you have a decent theme, chances are this will work fine without your needing to touch any code. To make the attachment pages more informative, add a bunch of meta data to your images. Magazine readers, which you can download from the WordPress Plugins page, or just search for “advanced custom fields” in WordPress’ back end where you “Add new” plug-ins. This plug-in lets you create your own custom fields, like the photographer’s name, coordinates, colour palette, etc. What you add is up to you. Using the add image size function mentioned above, you could create five or six image sizes and show Flickr-style download options that allow users to choose the dimensions of their preference. // Find the meta data field from the postmeta table, which contains the sizes for a given image. This is the ' wp attachment metadata' field, which contains a serialized array. By doing so, you lay a foundation for any media management system. You can easily add other meta data to your files by using the Advanced Custom Fields plug-in for WordPress. With this foundation in place and a few simple code tweaks, you can show images based on any of the custom fields you wish, displaying relevant and interesting information about them. Creating download buttons for multiple sizes and creating multiple colour palettes are only the tip of the iceberg.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath