I would like to measure parts of a jpg image with the measuring tool. What is the best way to do this and calibrate the measurements as the images will be taken at different magnifications.
Many thanks
Using and calibration of the measuring tool
Moderator: Kathy_9
Using and calibration of the measuring tool
Bob Willis
www.bobwillis.co.uk
www.leadfreesoldering.com
www.bobwillis.co.uk
www.leadfreesoldering.com
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JoeB
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Re: Using and calibration of the measuring tool
You'd have to be more specific about what you are trying to achieve. An image on a monitor does not have a fixed size in inches, for example, only in pixels. Therefore an 800 pixel wide and 600 pixel high image on a monitor that is set to a resolution of 800x600 will fill the screen, and if your screen is 18" wide you could say that the image is 18" wide on screen. However, if the monitor was only 13 inches wide the image would still fill the screen and you could say the image is 13" wide on screen. But regardless of how wide it looks onscreen, it's still always a fixed 800 pixels wide until and unless you upsize or downsize it.bobwillis wrote:I would like to measure parts of a jpg image with the measuring tool. What is the best way to do this and calibrate the measurements as the images will be taken at different magnifications.
Many thanks
So any portion of an image is a portion of the number of pixels of the entire image. If you want to know how many pixels wide or high a particular portion of an image is, draw a selection around it and you can see how many pixels wide and high the selection marquee is in the right hand corner of the status bar at the bottom of the workspace window. It doesn't matter if you have the image magnified or not, the number of pixels is the same - the pixels just look larger using the zoom function. You actually have to do a resize to change the number of pixels in an image.
Regards,
JoeB
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JRosenfeld
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JRosenfeld
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I posted a reply to the OP, adding to the info you provided, then decided that what I'd posted was wrong, so deleted it. Apologies again for confusion.JoeB wrote:Like the original poster, a bit more specificity wouldn't hurt. To whom were you replying, and exactly what did you mean?JRosenfeld wrote:Sorry, wrong info.
Regards,
JoeB