Hello.

My image should be...
1. Image should have a resolution of 72ppi.
2. Each image file must be 100KB no file sizes larger than 150KB.
3. Image physical dimension should be no larger than 4x6 inches and no smaller than 3x5 inches.
(These are the requirements in order to submit my image to my online photography teacher)

BUT when I made my image resolution to 72ppi and image physical dimension in to 4X5 inches, my image files becomes really small like about 20 KB !!! What should I do ???

I have both photoshop and XnView
Please explain in detail

THANK YOU