Limit Image Size will save space in disk and bandwith resizing large images when you upload them to WordPress.
No. In fact, you can also choose the quality of the final image, but it will not get this option everytime. When the options is ignored, the plugin will maintain the same quality.
We recommend no more than 1.5 megapixel for images. If your image have a square format, with 1 megapixel it will have the dimensions of 1.536px x 1.536px. Most users use monitors with less than 1.440 pixels wide, so with 1.5 megapixel your image will still be larger than the resolution of mosts users.
Any site can use ImageMagick, but it must first be installed by your site's server. You can check if your server have ImageMagick installed in plugion options section at the menu Media.
If a Fatar Error is displayed is because the site doesn't have enough memory to resize images. We have 4 recommendations in this case: * Ask your host to install ImageMagick which demands much less memory. * Try using the WebService, activating it's option at the menu Media. * If you're trying resize a PNG image disable the option Resize PNG images. PNG images uses a lot more memory than JPG images. * Ask your host to allow your site use more memory.