Using screenshots on a Mac

Submitted by calypso_rae on Thu, 17/01/2013 - 13:03

I would like to be able to grab images from the screen. This is easy enough to do with Windows, but I've never managed to do this with the Mac (a PowerMac from a vintage era).

My "Switching to a Mac" book gives various ways of capturing screen images. Basically, you press 'Shift, 'apple' and either the '3' or '4' key. They all give a reassuring camera-type noise, one even shows a camera icon.

So I feel fairly sure that the image has been grabbed, I just don't know how to retrieve it. Doing Edit->paste in MS Office for Mac doesn't work.

In Windows, I would normally paste a screen-shot into Paint, but I can't see any equivalent application on the Mac. Hope someone can help.

TIA, Robin

Re: Using screenshots on a Mac

Submitted by Robert Wall on Thu, 17/01/2013 - 14:45.

"These screenshots by default get saved to the desktop." (Quoted from http://howto.cnet.com/8301-11310_39-57405901-285/how-to-change-the-locat...)

Whether it works for your OS (which is...?) I've no idea.

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Thu, 17/01/2013 - 15:27.

That's right - the screen shot is saved as a .png to your desktop.

I'm guessing you have too many Arduino IDE windows open to see it!

Re: Using screenshots on a Mac

Submitted by calypso_rae on Thu, 17/01/2013 - 15:37.

Sure does, Robert. Under all the layers, my desktop has recently acquired Picture1.png, Picture2.png ...

Many thanks, Robin

OS X 10.5.8

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Thu, 17/01/2013 - 15:46.

Shame about the x axis....

Re: Using screenshots on a Mac

Submitted by calypso_rae on Thu, 17/01/2013 - 16:14.

I'm working on it Paul ...

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Thu, 17/01/2013 - 16:18.

If that National Grid can't even get that right, can we trust them to keep the kettles running?

http://www.nationalgrid.com/uk/Electricity/Data/Realtime/Frequency/Freq6...

And why the 60 in the URL - surely it should be 50 in this side of the pond ;)

Re: Using screenshots on a Mac

Submitted by calypso_rae on Thu, 17/01/2013 - 16:51.

How's this for a match? My system appears to measure slightly low, but the shapes of the two graphs look pretty similar:

Howzatt!!

Re: Using screenshots on a Mac

Submitted by Robert Wall on Thu, 17/01/2013 - 19:43.

And why the 60 in the URL - surely it should be 50 in this side of the pond ;)

Paul, there are 60 minutes in an hour on this side of the pond.

Re: Using screenshots on a Mac

Submitted by calypso_rae on Thu, 17/01/2013 - 20:38.

And why the 60 in the URL -

Maybe because they only display data for the past hour. Bit of a pain that, when I was looking forward to comparing 24Hrs worth of my results with theirs :-(

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Thu, 17/01/2013 - 22:28.

You lot are FAR too serious. My "60" comment was tongue in cheek. I even put a smiley at the end in case anyone didn't realise.

I'll try harder next time. ;) <-------

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Thu, 17/01/2013 - 22:30.

Robert, there is historic data available. A brown looking site I posted the other day (sorry, on my ipad so hard to go searching). Anyway, if you find that site I seem to remember a link to dl the raw data.

Re: Using screenshots on a Mac

Submitted by calypso_rae on Fri, 18/01/2013 - 08:36.

Can it supply data for variations of frequency as well as for demand?

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Fri, 18/01/2013 - 08:41.

Yes!!!!

http://www.gridwatch.templar.co.uk/, click the download button near the top.

Re: Using screenshots on a Mac

Submitted by calypso_rae on Fri, 18/01/2013 - 10:12.

Wow, that's some datafile Paul. The file that I downloaded includes the mains frequency for every 5 minutes from 27/5/11 to 10/1/12. The data stops abruptly at row 65536, which sounds a familiar number. Maybe the problem is with my Office For Mac application.

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Fri, 18/01/2013 - 10:21.

Yup - that's your old copy of Excel. The copy I downloaded an hour ago went up to row 172933

Shout if you want me to extract a smaller dataset for you. PM me the range you want, and an email address to send it to.

Re: Using screenshots on a Mac

Submitted by calypso_rae on Fri, 18/01/2013 - 12:24.

Thanks Paul. I guess we could do with a new thread for this topic.

Re: Using screenshots on a Mac

Submitted by Robert Wall on Fri, 18/01/2013 - 13:13.

Paul, have a , and don't get at me!

Re: Using screenshots on a Mac

Submitted by Robert Wall on Fri, 18/01/2013 - 14:08.

... went up to row 172933

I raise you 172990! LibreOffice (free download & use) will handle the full dataset.

Re: Using screenshots on a Mac

Submitted by PaulOckenden on Fri, 18/01/2013 - 14:18.

Another row every 15 minutes. I think this game of poker will last a while.

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