Moak is confused and hopefully someone can un-confuse me. My images are all shot in either J-peg or RAW on my Sony A-65. In order to submit photos to most all publications they are asking for at least 300 PPI. My photo app on my mac is only reproducing at 72 DPI My image sizes vary widely from 6,000 x 4,000 down to 4,000 x 2,900 I've seen that an image of at least 3240 x 4320 is needed to produce 300 PPI. If I send the big files is the receiver going to get the 300 PPI out of them? Or, must I purchase an upgraded photo app for my MAC in order to convert to 300 PPI? and if so, which one? This is all new territory for me. Sometimes I miss the simplicity of Fujichrome. Thanks for all your responses in advance.