Batch with condition

[Rzulty]

I'm kinda new to nConvert but I've been using XnView for a while mostly to do one almost repeatable action:
I have jpgs with many different width/height ratios and I want to have them all 280x280px but I don't want to deform them so I have to do two things: first choose which is bigger: width or height and resize the image so the bigger dimension would be 280px. Next I want to resize canvas with given background color to make the image 280x280px.
My question is: how (if it is possible) to make a nConvert script with condition (the script should first recognize what is bigger - width or height)?

Cheers,
Rzulty

[xnview]

I'm kinda new to nConvert but I've been using XnView for a while mostly to do one almost repeatable action:
I have jpgs with many different width/height ratios and I want to have them all 280x280px but I don't want to deform them so I have to do two things: first choose which is bigger: width or height and resize the image so the bigger dimension would be 280px. Next I want to resize canvas with given background color to make the image 280x280px.
My question is: how (if it is possible) to make a nConvert script with condition (the script should first recognize what is bigger - width or height)?

It's not possible, but you can resize it with ratio, and use canvas resize after