Measure an object size in pixels?

[UlteriorModem]

I was trying to chase down a few dust doughnuts in my system. There is a website that will calculate the approx. distance from your sensor.

http://www.ccdware.com/resources/dust.cfm

Anyhow one of the pieces of data it asks for is the diameter of the dust mote in pixels.

Is there any way to measure this in PI?

[pfile]

to my knowledge not directly... what i do is put the cursor on the left edge of the mote and note the X coordinate of the cursor position, then move over to the right edge and note the X position and then take the difference between the two.

rob

[UlteriorModem]

to my knowledge not directly... what i do is put the cursor on the left edge of the mote and note the X coordinate of the cursor position, then move over to the right edge and note the X position and then take the difference between the two.

rob

Ah! That's a great idea, thank you.

[wadeh237]

You could also just create a preview that captures the object and then look at the size of the preview at the bottom of the screen.

[pfile]

that is a great idea, thanks

[UlteriorModem]

You could also just create a preview that captures the object and then look at the size of the preview at the bottom of the screen.

Another great and even easier idea!