What Is The Optimum Image Size For Images To Be Stored

150 x 150 pixels is a good size for the web as well as thumbnails and reports.  There is no limits or requirements but for both in Infusion, this would definitely be the optimal size.

The recommended file size for logos stored in Infusion is 15-50kb larger but the smaller the better while still retaining a good quality image.

Remember the larger the images the more room required for backups as well.