[Plugin: Slideshow Gallery Pro] Slideshow Thumbnail Size

in slideshow-gallery-pro/models/slide.php

image_resize($imagefull, $width = 100, $height = 100, $crop = true, $append = 'thumb', $dest = null, $quality = 100);

put $crop = false and that should work. It’s about line #88
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You will have to reupload your photos for that to process. You can also create your own thumbnails and save them as uploadedimage-thumb.jpg (in uploads/slideshow-gallery-pro/) and they will be read as the thumbnail.

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And to note, nowhere does it mention getting wider thumbnails if you donate.