Size of Preview Picture

[RDS]

I am using VNC and I have some (Python 3) code that includes the following lines.

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camera.start_preview()
time.sleep(20)
camera.capture
camera.stop_preview()

The preview image covers the entire VNC screen and is therefore really poor quality, however, the actual picture that is saved to file, when viewed, is a lot smaller and looks perfect.

Is there any way I can prevent the 'preview' image being so large. Ideally, I would like it to be the same size as the picture that is saved to file.

[6by9]

start_preview takes parameters to pass into the PiPreviewRenderer
https://picamera.readthedocs.io/en/late ... pirenderer

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class picamera.PiRenderer(parent, layer=0, alpha=255, fullscreen=True, window=None, crop=None, rotation=0, vflip=False, hflip=False)

so

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start_preview(fullscreen=False,window=(100,200,300,400))

should put it at (100,200) with width/height 300x400. Amend numbers to suit.

[RDS]

@6by9
Thank you very much. That is just what I needed.
(I found that another close bracket was needed at the end of the start_preview line of code, just in case anyone else requires the same solution)

[6by9]

@6by9
Thank you very much. That is just what I needed.

Documentation is a wonderful thing, and waveform80 has done a very good job on it.

(I found that another close bracket was needed at the end of the start_preview line of code, just in case anyone else requires the same solution)

Edited.

[RDS]

@6by9
This is so powerful.
I have taken it a step further now on another Pi I have that controls a NOIR camera inside the lid of my Solar Panel Meter.
It takes pictures of the meter from a cron job and until now, the picture it took was always a large picture with the actual meter shown in the middle. I have now added the 'crop' parameter so the picture now just shows the actual figures.
Thanks again.