2

Choose "fixed size" in the Marquee selection tool ribbon and set it to 720x720 (or 720xH for whatever your height is). Then place a selection on the canvas. Then drag it left or right until it centers (the center vertical line should show when it does).


1

When you do Automate -> Batch, you refer to a certain script (or "action" in the Photoshop parlance). Just make that action explicitly save the image the way you want. Open a sample image. Create a new action and start recording. If you want to export in a certain profile, do Edit -> Convert to Profile explicitly. Do File -> Save As...,...


1

Possibly just using a luminosity mask and de-saturating the lighter parts:


1

Mostly it is about color temperature, white balance (they're not the exact same thing), contrast, and then using an HSL/HSV/HSB (Hue-Saturation-Luminance/Value/Brightness) tool to mute some colors, shift the hues of other colors, and emphasize other colors.


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