Microsoft Photo App
Mac Preview
Photos app on Mac
1. Under "Image" use any combination of "Auto Tone", Auto Contrast" and/or "Auto Color"
2. In Photoshop under “Image Size” Reduce the “Pixel Dimensions” to 3000 spixels or less for the largest dimension of your image - Make sure "Resample" has a check mark next to it - and click “Ok”.
3. Under “File” select "Save as" then select where on your computer or external hard drive you want to save the image - then: