# Device.ImageRect and 3rd Gen Stack

**URL:** <https://forum.commonvisionblox.com/t/device-imagerect-and-3rd-gen-stack/1780>\
**Category:** .Net API\
**Tags:** acquisition\
**Created:** [August 26, 2022, 2:57pm UTC](https://forum.commonvisionblox.com/t/device-imagerect-and-3rd-gen-stack/1780 "2022-08-26T14:57:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BitSmith](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/bitsmith/32/1093_2.png) [@BitSmith](https://forum.commonvisionblox.com/u/BitSmith)\
**Post date:** [August 26, 2022, 2:57pm UTC](https://forum.commonvisionblox.com/t/device-imagerect-and-3rd-gen-stack/1780/1 "2022-08-26T14:57:51Z")

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Hello,

I hope this is a quick question to answer.  
I believe from my testing that the IImageRect isn’t supported/implemented for devices using the GenTL (3rd Gen Stack).  
Is this correct?  
Is there an alternative method for changing the image size being acquired?

Many Thanks

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<div class="post-metadata">

**Author:** ![MandanaS](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/mandanas/32/1211_2.png) [@MandanaS](https://forum.commonvisionblox.com/u/MandanaS)\
**Post date:** [August 31, 2022, 2:04pm UTC](https://forum.commonvisionblox.com/t/device-imagerect-and-3rd-gen-stack/1780/2 "2022-08-31T14:04:06Z")

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Hi @BitSmith

Sorry for the late response due to the vacation season!  
In GentTL you need to set the new image size in the camera NodeMap and then call the function RegisterManagedFlowSetPool. For more details please see the following contribution in our forum: [https://forum.commonvisionblox.com/t/how-to-update-driver-memory-after-changing-camera-parameters/1526/9](https://forum.commonvisionblox.com/t/how-to-update-driver-memory-after-changing-camera-parameters/1526/9)