How to stop twenty fifteen theme from cropping featured images?

The twenty fifteen theme always crops featured images, it cuts from both lower and upper part of the image usually.

How to prevent it? How to show the normal (full) dimensions of featured images?

In functions.php:

add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size( 825, 510, true );

changing above to higher dimensions dont take any effect. How to fix?

Topic theme-twenty-fifteen post-thumbnails functions themes Wordpress

Category Web

1
answered at

if you already uploaded the image, and change the resolution, it will not affected, unless you regenerate the thumbnail or upload a new one.

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