I'm working with a graphic designer who doesn't know how to design for the web, I can't blame her, she's not a web designer.
She keeps sending me pictures and PSDs that seem too big, I do my estimations and create them using CSS, she sees them and says it's too big. In the screenshot I can see that an image is 70% or 80% the width of the screen, so I do it as I see it, but her measurements are different.
The main problem is that she doesn't know how to specify how big her images should be in terms of percentages and the average width of an image is 1100px. She doesn't know that the average screen size is 1024.
I need a way to scale everything down to 1024px so that I can test her precise design on real screens and then convert them back to percentages. If that task can be automated then there's no need to ask her, she's comfortable working with a big scale and I respect that.