Image Style Quality

"Set JPG quality per image style
This module allows you to specify a custom quality on different image styles you create. After installing and enabling this module, you will have the option to add a new effect to your image styles, enabling you to change the quality."

Image Resize Filter

"The easiest end-user solution for resizing inline images.

This filter makes it easy to resize images, especially when combined with a WYSIWYG editor such as tinyMCE or CKeditor. Users never have to worry about scaling image sizes again, just insert an image and set it's height and width properties in HTML (this is done automatically by WYSIWYG editors) and the image is resized on output to match the HTML."