Categories

# How To Find The Area Of An Object Using Photoshop

There are mathematical or drafting programs that may do a better job of finding areas of all sorts of seemingly random two-dimensional shapes, and I may have used one or two of these as a student, but I haven’t had any of them on my computer for many moons. So when I recently needed to compare the size of the visible sun at different times during a solar eclipse so I could compare exposure levels, I was out of luck. But then there was Photoshop. I just finished this article about how to find an object’s area, and put it on our website at www.beehappygraphics.com/articles/find-area.html, mainly because I mentioned the technique in an earlier blog post, and was about to mention it again in an article I promised about the challenges of our newest eclipse image.  This probably isn’t the most common task you will be doing, but when you need it, this can be handy.  Enjoy!

## 2 replies on “How To Find The Area Of An Object Using Photoshop”

[…] each sun appropriately. To do that I used Photoshop again to find the relative area of each sunHow, and then use that area to determine how much darker its part of the sky should […]

[…] I have some ideas for shooting the eclipse by either phone or SLR camera. Â For those who haven’t heard, the next eclipse will be Monday, August 21st. In Miami, the eclipse will start around 1:30 pm, which is right after local apparent noon (when the sun crosses due south of us around 1:24 pm and is 77Â° above the horizon). The eclipse will last about three hours, by which time it will have reached an azimuth (compass bearing) of 261Â° and dropped to a height of 44Â°. At its peak just before 3 o’clock, it will be 64Â° above the horizon at a bearing of 243Â° (west-southwest). At that time, less than 1/5 of its diameter will be visible in South Florida, which means that about 22% of the sun’s area will still be showing, and the sun will still be a little less than 1/4 of its normal brightness (for lack of anything better at hand, I used Photoshop’s Count Tool to figure the sun’s brightnessHow). […]

This site uses Akismet to reduce spam. Learn how your comment data is processed.