Every image can be differently scaled.
- Widen - Thumbnail will be scales by thumbnail template width. Every thumbnail will have same width. Good for masonry grid. Basic image is 1920x1080 resolution for example, thumbnail template is 350xcalc(calc means height will be calculated) (original height / original width) x new width = new height (1080 / 1920) x 350 = 197. Thumbnail will be 350x197.
- Heighten - Thumbnail will be scales by thumbnail template height. Every thumbnail will have same width. Good for justify grid. Basic image is 1920x1080 resolution for example, thumbnail template is calcx350(calc means width will be calculated) (original height / original width) x new height = new width (1080 / 1920) x 350 = 622. Thumbnail will be 622x350.
- Crop - Thumbnail will be cropped from original image. Also you can use ratio like 16x9 to make correct size.
Retina - controls create for this thumbnail template retina images, when in gallery options generate retina is activated.
Quality - set thumbnail quality this you can check in concrete image thumbnail preview.
Recreate thumbnails - system will find all thumbnails created by this template and recreate them with all new props.
If thumbnail template deleted
If you delete thumbnail template every image that has such thumbnail will highlight it. You can delete it or stay as it is. It doesn't affect to already created thumbnails.