Hi, I’d like to center the thumbnail of simple viewer images gallery,
and increase size of thumbnail also to fill the entire width (930px)
A thumbnail by its very definition is a small rendition of a much larger image, about the size of the nail on one’s thumb. I am not sure how WordPress will react to having thumbnails larger than its large size image presets.
The best way to go about it, is to first install the Simple Image Sizes plugin ( http://wordpress.org/extend/plugins/simple-image-sizes/ ). The plugin will give you complete control over all images in the theme -from aspect ratio, to width, whether to crop the image, and even has a built in thumbnail re-generator.
After installing the plugin, you will find your Settings > Media page in the back-end to contain the various sizes. Then simply find the dimensions you want to change. Save. Regenerate the images and see if you like what you see or want to tweak the image sizes further.
Basically in Settings > Media, you would need to change the size to whatever you want, and then click regenerate button which will become available after installing the plugin.
Please let us know how everything worked out.
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