OSX utility for quick screenshot region/selection capture with fixed aspect ratio?

Question

I need to visit hundreds of websites and take screen captures of certain regions of the screen. The region is always the same aspect ratio. My process now, is to take a full screenshot, bring it into Photoshop and make my selection using a fixed aspect ratio and finally saving the image. It takes a while, considering I have to do this hundreds of times.

I've seen OSX utilities for taking screen captures (including the built-in OSX ones) but I'm looking specifically for one where I can capture just a area/selection of the screen AND (ahead of time) tell it what aspect ratio I want that area/selection to be. I simply want to press a button, move or select the area (which is already fixed at the desired aspect ratio) and then type in a filename to save it.

Does anything like this exist?

Answer 1

There are two options to make this whole thing a lot easier for you - they are tools that specifically take screenshots of webpages with you having to go through the rigmarole of visiting the site, taking a screenshot and then editing it in Photoshop or the like.

webkit2png is a command-line tool, and probably the most automatable if you are comfortable with the command-line.

Paparazzi is a GUI tool that does much the same thing.

Both a free.

Answer 2

Now i've tried it: XScope contains a tool named "frames". You can place a frame on your screen, resize it to your desired size and aspect ratio and take as many screenshots as you like without losing the frame or its position/aspect ratio.

It'll save those screenshots to your desktop appending a number, so it's not exactly what you're looking for, but i think it's close.

hth.

Answer 3

IF you don't want to get anything new, you can make a macro in Photoshop to crop the image down to the size you want it, then batch run it on all the screenshots you've taken.