13-02-2019, 04:55 AM
I have used PhotoShop to count pixels and scale from photos and photos of drawings. Open the image and use the selection tool to carefully select a known part of the image. Copy that selection. If you open a new project while you have something in the clipboard, it will make the canvas the size of that selection. It also tells you what that size is. So, if your 1.25" wide part selected is 400 pixels wide in the image, you can extrapolate that your image is scaled to 320 pixels per actual inch. Now, you can go about the image selecting parts, counting pixels and calculating sizes. With zoom and careful selection you can get quite accurate. I'm sure most image editing software can be used similarly. You do need one known dimension to start with. Enjoy, Mike