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Today's Topics:
1. Re: Masking issues - RPi 4 (Barry Martin)
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Message: 1
Date: Tue, 24 Jun 2025 15:02:23 -0500
From: Barry Martin <[email protected]>
To: Roger Heflin <[email protected]>, Adam Briggs via Motion-user
<[email protected]>
Subject: Re: [Motion-user] Masking issues - RPi 4
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8; format=flowed
Hi Roger!
I think I was overthinking your replies.? What worked here was taking a
screenshot (png), opening that with GIMP and editing -- basically a
black rectangle overlying the general fan area and white rectangles for
the rest.? Save that as .xcf? (default for GIMP).?? Have GIMP export to
.pgm.? Copy the file to /etc/motion, edit Camera1.conf.? Restart Motion
and enjoy not having '3-trillion' Motion files of fan rotations! <g>
Thanks!
Barry
> I never do a "new" image. I always open and edit the image off the
> camera (from the snapshot motion option) that I collect 1x per hour,
> that way the size is always right.
>
> Then I export/save it from gimp as pgm.
>
> You can also use vlc and/or mplay to play one of the collected vidoe
> files from motion and see what size it tells you.
>
> On Tue, Jun 24, 2025 at 10:20?AM Barry Martin <[email protected]> wrote:
>>
>> Hi Roger!
>>
>> I always start with an image pulled from the camera and open that in
>> gimp.. It is kind of a pain to paint it black and/or white for the
>> mask but it also gives me a good idea of what moves a lot and needs
>> masked.
>>
>> Yes, got that far: I have a black and white pgm file with black in the area
>> (and slightly beyond) where the fan rotates. It's that second part ("Line
>> 2") I need help figuring out (see quote, below).
>>
>> Thanks!
>>
>> Hi Roger!
>>
>> You need to make a mask file. Take an image from the camera, read it
>> into gimp, then paint everything black you want ignored, and white you
>> don't want to ignore and export it as a binary pgm.
>>
>> Created the mask file: 205_Mask.pgm. Basically first time using GIMP --
>> heavily relied on an old lesson: save the file when have a correct step!
>>
>>
>> file should look like this:
>>
>> file gs2_mask.pgm
>> gs2_mask.pgm: Netpbm image data, size = 3840 x 2160, rawbits, greymap
>>
>> And have the same size as your camera image.
>>
>> This part I'm getting confused with. Figuring:
>>
>> Line 1: Open the newly-created mask file (so 205_Mask.pgm)
>>
>> Line 2: Ummmmm.... I'm thinking some sort of command line or check
>> the boxes dropdown. My camera's resolution is set at 1280x720. so plug
>> that in for size.
>>
>> Thanks!
>>
>> Barry
>>
>>
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