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dp
09-12-2010, 01:37 PM
I've been browsing the 'net looking for presentation tools and found a couple that are interesting.

Screencast-O-Matic:

This free tool will let you define an area of your screen that you wish to record to a video, and then capture everything that happens within that window. The final product can be uploaded to their site for later distribution, to YouTube, or copied to your local drive.

Suppose you have a CAD package and you wish to demonstrate some feature, or present a drawing as part of your presentation.

http://screencast-o-matic.com/

Screen Calipers:

Ever wish you could find and show the size of objects in a photograph? Screen Calipers does that, and can embed a ruler into the image. How you use it is left to your imagination.

http://www.iconico.com/caliper/

vBulletin Code:

Every wonder how to format your posts here? It's really quite simple and the hint screen is a click away at the bottom of each page of this forum. But here's the link if you're impatient:

http://bbs.homeshopmachinist.net/misc.php?do=bbcode

But wait - there's more!. The newer versions of vBulletin forum software have more exotic formatting options, so lick your lips and hope HSM upgrades!

http://www.vbulletin.com/forum/misc.php?do=bbcode

And what about those smilies? (aka <sfsf> on the urban dictionary)

http://bbs.homeshopmachinist.net/misc.php

lazlo
09-12-2010, 03:41 PM
Screen Calipers:

Ever wish you could find and show the size of objects in a photograph? Screen Calipers does that, and can embed a ruler into the image. How you use it is left to your imagination.

http://www.iconico.com/caliper/

ACK! $30?! Meazure has far more features, and is free. But no Mac port :p

http://www.cthing.com/Meazure.asp

dp
09-12-2010, 03:46 PM
ACK! $30?! Meazure has far more features, and is free. But no Mac port :p

http://www.cthing.com/Meazure.asp

That's why it didn't make the list :) Free but unavailable is not helpful.

oldtiffie
09-12-2010, 06:27 PM
Dennis (dp).

If I've got the message as regards the "caliper", is it not only accurate to one pixel?

If that's so, wouldn't it only be as accurate as the resolution of the image either on the screen or in the pic or CAD or PDF file?

In short, the finer/better/higher the resolution the better/more accurate the measurement?

If that is correct, it seems that I would need a resolution of 1,000 pixels/inch to get an accuracy of 0.001".

That too presupposes or assumes that there is no distortion in the pic/image/pdf file.

I can see the use for it in the hi-res images you posted recently of a set of spur gears with the intent to getting the gear pressure angle.

(Edit)
Irrespective of the screen/image resolution, to get a "real world" measurement, I would still need something in the image known (to me) of an accuracy at least that of the resolution to refer to so that I could use it to find the "scaling factor" that I would need to convert the "caliper" measurement to an accurate measurement on the job.

Your gears that I referred to are a good case in point as, say, measuring over several gear teeth and using the caliper measurement (pixels) and converting that measurement by using pixels/inch (presumably done by the caliper software) will still need a physical dimension/size as a check.
(End edit)

lazlo
09-12-2010, 06:28 PM
That's why it didn't make the list :) Free but unavailable is not helpful.

Well, free and available to 97% of the world ;)

dp
09-12-2010, 07:04 PM
Dennis (dp).

If I've got the message as regards the "caliper", is it not only accurate to one pixel?

If that's so, wouldn't it only be as accurate as the resolution of the image either on the screen or in the pic or CAD or PDF file?

No matter what you put on the screen the only resolution available is at the pixel level. In the real world of CNC a CAD drawing may be accurate to 0.0001 but while you're looking at on on your computer that is reduced to +- one pixel. That is what the caliper measures. If you are measuring the width of a garage door in a photograph that is probably close enough.



I can see the use for it in the hi-res images you posted recently of a set of spur gears with the intent to getting the gear pressure angle.

Yes - and they also sell a protractor and a micrometer that can measure diameter. You do need something in the picture to use as a reference so you can set the scale to a meaningful number. For example - scan a gear and put a machinist's rule in the picture, and you can use the rule to set the scale.


(Edit)
Irrespective of the screen/image resolution, to get a "real world" measurement, I would still need something in the image known (to me) of an accuracy at least that of the resolution to refer to so that I could use it to find the "scaling factor" that I would need to convert the "caliper" measurement to an accurate measurement on the job.

I should have read ahead :)


Your gears that I referred to are a good case in point as, say, measuring over several gear teeth and using the caliper measurement (pixels) and converting that measurement by using pixels/inch (presumably done by the caliper software) will still need a physical dimension/size as a check.
(End edit)

And of course if you're using the protractor, the angle is read directly in degrees/radians/grads, what ever.

dp
09-12-2010, 07:06 PM
Well, free and available to 97% of the world ;)

True - but when I'm looking for something it's always with the Mac in mind, and if it also happens to support Windows then so much the better. I actually like the complete tool kit suite the Screen Calipers is a part of that I'm tempted to buy it.

oldtiffie
09-12-2010, 07:34 PM
Thanks Dennis for the quick and comprehensive reply.

I have a Microsoft "Lifecam" "Cinema" web cam (1280 x 720 - 5MP (interpolated)) that by and large works pretty well. I use a shop rule as a scaling reference. It can get down to ~ 8>9 x magnification but at a very short focal distance. The big advantage of it is that I can use the computer screen as a live "viewer" before "snapping" the image.

My guess is that the caliper will work on a pixel basis irrespective of whether the image is in "view" mode or whether it is from the "snapped" *.jpg file.

It is one of my future projects for a reasonably good "comparator". It has a long way (and time) to go yet - with a lot of others on that very crowded "back-burner".

My images - as will be the case with many others - can be from screen capture, web-cam, digital camera, desk-top scanner etc. and as the "caliper" and "protractor" will work with all of the pics/images from all of those sources it will fit in very well with my computer monitor 1920 x 1080 resolution as well.

I'd like, but don't expect, absolute accuracy (that is what CAD is for) but just enough for me to interpret and make an educated (or more likely a wild-ar$ed) guess about so that I can get on with what I want to do.

I need to check the "caliper" and "protractor" out in a bit more detail yet. But its looking good based on your info to date. Cost will not bother me if its good value for my purposes and fit within what I am prepared to pay.

christiandersen
08-31-2013, 12:07 PM
You can measure easily with the tool: KLONK Image Measurement (http://www.imagemeasurement.com) there is a free, a trial and payable versions.

dp
08-31-2013, 03:06 PM
there is a free, a trial and payable versions.

And apparently available only for Windows. The Iconico people seem to have given up on their Mac version but there's this now for $10.00: http://www.ondesoft.com/rulers/

Evan
08-31-2013, 03:54 PM
I guess I should post this here as well. Didn't see this until after I already posted it in the old thread.


It is very easy to make your own on screen measuring tools. With Win 7 you can download a free on screen active desktop tool. This will display anything you want in a web page even if the web page is located locally. The web page can be stupid simple to display any local image you want including a picture of a ruler that has be sized to match the pixels per inch of your display.

All the web page needs to look like is this:



<html>
<body bgcolor="#000000">
<img src="f:\images\desktop\image.png">
</html>



The web page text may be worked on in notepad and should be saved with an .htm extension
The bgcolor command sets the background of the page to black but it can be any color. The colors are in two byte hex but can also be in standard colour names.
The img command tells where to find the image anywhere on the machine.

The Active Desktop tool has a setting for the URL of the web page which can be anywhere on your machine and it has settings for the X and Y size of the page, or in this case the image. This allows you to paste an image of anything anywhere on your desktop any time you want without involving the desktop background. It can easily be moved at any time the same as any gadget.

Active Desktop tool:

http://win7gadgets.com/tools-utillities/activedesktop.html#.UiI4YEA2i7Q