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Using BB Gallery Module using Lightbox option

Notice the light box images are limited to 1024 pixel width

Using WordPress Gallery with custom jQuery

Using the standard WordPress gallery, (created within Text Editor module) popup images display Full-size.
jQuery shown below.

Here's my jQuery

jQuery( function(){ jQuery( '.gallery-icon a' ).magnificPopup({ type: 'image', gallery: {enabled: true}, preload: [1,2], mainClass: 'mfp-fade', fixedContentPos: false }); });