As there are different layout option in UpMail templates, there are certain image sizes which are optimal. Below we will outline the preferred ones. Besides the hero shot, the preferred ratio would be 2:1
1. Hero shot - the ideal size for these images is 600x200 pixels, or 3:1
2. Two columns image - the best size is 292x157 pixels or any image with a size ratio 2:1
3. Three images - 1 large and 2 small. When using this layout, the best size for the larger image is 398x214 pixels and 196x100 for the two smaller ones
4. Three small images - here the images will be rescaled to 192x100 pixels, again with a ration close to 2:1
