Lightroom
How to resize in Lightroom
1. In Develop mode - top right corner
2. Go to File / Export - top left menu.
3. Export to desktop.
4. Still in the Export Menu.
Scroll down to File Settings, Image format is JPEG, Colour space is Srgb at 100%
Width 1400 and Height 1050 - no matter what the orientation of your image is.
Finally, click Export.
5. Go to Desktop.
Click on the Lightroom file icon, your picture will be resized.
