How do I select a Region of Interest (ROI)?

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EmeraldHills
Posts: 5
Joined: Sun Jan 31, 2021 5:13 pm

How do I select a Region of Interest (ROI)?

#1

Post by EmeraldHills »

First, I love Sharpcap and I'm a regular subscriber to Sharpcap Pro. Your polar alignment procedure ALONE would be worth the price of admission. Thank you for your continuing commitment to innovation and excellence.

I just purchased a new ZWO ASI2600MC Pro. The Region of Interest command appears not to be available. This concept interests me, especially since the ASI2600 has such a wide FOV. Is there something I need to do to enable this control? ... or, if it's not provided by ZWO, does that mean I won't be able to use that control with this camera? Thank you for any help you can give.

Doug
Louisville, KY, USA
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admin
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Re: How do I select a Region of Interest (ROI)?

#2

Post by admin »

Hi Doug,

getting the ROI function to work in SharpCap is a two-step procedure – first you choose a smaller image resolution in the 'Capture Area' control. Once you've done that an ROI selection box will appear just below the Capture Area - you can drag this around to select what part of the sensor you want to use.

Cheers, Robin
EmeraldHills
Posts: 5
Joined: Sun Jan 31, 2021 5:13 pm

Re: How do I select a Region of Interest (ROI)?

#3

Post by EmeraldHills »

Robin, thank you sooooooooooo much for your help. I'm just so sorry that i didn't know this before -- which meant you had to ask. But this is super-helpful. Thank you!!!
GaryB
Posts: 6
Joined: Fri Oct 10, 2025 2:11 pm

Re: How do I select a Region of Interest (ROI)?

#4

Post by GaryB »

Thought I should tag on to this thread instead of starting a new thread.

I took some footage of Saturn last night (Celestron Skyris 445C) which is probably too out of focus to use but it's all part of the learning process.

I tried to decrease the image size by using 'select ROI' but this option doesn't seem to be available in the camera control box.

Have read that a lower resolution needs to be selected for the option to appear but this is currently fixed at 1280 x 960.

The function is available and works in its iCap software, hopefully it's just a camera/app setting that needs changing.

Cheers, Gary
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Re: How do I select a Region of Interest (ROI)?

#5

Post by admin »

Hi Gary,

unfortunately this is a limitation of some of the Celestron Skyris cameras - they don't have a facility to capture images except at the maximum resolution of the camera (at least none that I could ever get to work reliably with the ones I have here). Because of that SharpCap only offers the maximum resolution in the list and the various ways to select a sub-area are unavailable. Note that this behaviour varies from model to model in the range, so will not necessarily apply to every Skyris camera.

cheers,

Robin
GaryB
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Joined: Fri Oct 10, 2025 2:11 pm

Re: How do I select a Region of Interest (ROI)?

#6

Post by GaryB »

Thanks Robin, I suspected that might be the case.

I will hopefully upgrade soon.
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