use WP_Image_Editor() quality for letterbox quality

[t-wright]

Get's the quality from WP_Image_Editor() and uses that in imagejpeg. Means quality can be controlled with jpeg_quality filter.

In response to #693.

[jarednova]

Awesome, thanks @t-wright!

[t-wright]

No worries! A tiny contribution...

Quality can then be set by the theme:

function my_jpeg_quality() {
    return 100;
}
add_filter( 'jpeg_quality', 'my_jpeg_quality');

[jarednova]

awesome, thankya!

[prisis]

Can you add a small text to the wiki, about this?