PixInsight Forum (historical)

PixInsight => General => Topic started by: UlteriorModem on 2020 January 23 15:32:24

Title: Measure an object size in pixels?
Post by: UlteriorModem on 2020 January 23 15:32:24

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?

Title: Re: Measure an object size in pixels?
Post by: pfile on 2020 January 23 15:59:58

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

Title: Re: Measure an object size in pixels?
Post by: UlteriorModem on 2020 January 24 09:53:35

Quote from: pfile on 2020 January 23 15:59:58

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.

Title: Re: Measure an object size in pixels?
Post by: wadeh237 on 2020 January 24 16:58:17

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.

Title: Re: Measure an object size in pixels?
Post by: pfile on 2020 January 24 17:51:42

that is a great idea, thanks

Title: Re: Measure an object size in pixels?
Post by: UlteriorModem on 2020 January 25 13:15:44

Quote from: wadeh237 on 2020 January 24 16:58:17

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!