Some code I wrote to make redlines easier. I've found this is standard procedure for some web shops I've worked at, but not others. Redlines are a way to mark up a visual web layout with dimensions and specs which are then handed over to developers.
Because it's a repetitive task of selecting things and figuring out pixel dimensions I wrote Photoshop scripts that automate the process, instantly filling in measurements based on a selection – vertical, horizontal, or both height and width for image.
All three scripts are available free of charge, and can be downloaded here.