Sizing images for templates
As regular users already know we’ve added some code to the templates that will automatically resize images that are too large (physical size) to fit within alloted space. Previously some users were uploading very large images that were effectively breaking the templates.
Campaigns that contain images of a large file size also use up a lot extra system resource when they are sent out. They can also be extremely slow for users to download and this obviously has a negative impact on the effectiveness of the campaign.
This resizing should only take effect on very large images and if you resize your image first in a software package like Adobe Photoshop you will usually achieve a better result. As a general rule logos and graphics should be saved as Gifs and photographs as Jpegs.