1) see this post for details on changing the image size:
showpost.php?p=36751&postcount=2
2) To remove the image title from the full size image, change the following code in the gallery.js file:
//fullsize
this.fullsize = {
images: this.wrapper.getElement('.fullsize').getElements('img[class!="loader-image"]'),
imagesSrc: [],
width: this.wrapper.getElement('.fullsize').getStyle('width').toInt(),
height: this.wrapper.getElement('.fullsize').getStyle('height').toInt(),
title: this.wrapper.getElement('.title').getElement('.fullsize-title'),
description: this.wrapper.getElement('.title').getElement('.fullsize-description'),
loader: this.wrapper.getElement('.fullsize').getElement('.loader')
};
to:
//fullsize
this.fullsize = {
images: this.wrapper.getElement('.fullsize').getElements('img[class!="loader-image"]'),
imagesSrc: [],
width: this.wrapper.getElement('.fullsize').getStyle('width').toInt(),
height: this.wrapper.getElement('.fullsize').getStyle('height').toInt(),
loader: this.wrapper.getElement('.fullsize').getElement('.loader')
};