Foto2avi can handle any size of photos but you will have performance problems with really large photos (2000x1000) .
The best solution before process them is to resize them using XnView or any other image resizer
[XnView is totally free ]
Here is an small guide on how you can do it.
Step1 : Run XnView and find the photos that you want to incude on Foto2Avi
Step2 : Press Batch Convert
Step 3: Select the format (jpg), select the output folder (create a new one) and press the tab 'Transformations'
Step 4: Press Image->Resize->Add . Select Resize at the parameters add 720 in width make sure that keep ratio is selected and press the 'Go' button !!!
You are done ! Now load the small photos on your Foto2Avi project !!!
Small XnView Guide
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