[Automatic masking by colour]

Thank you @NathanC, @NotMyFault and @thomaso for answering my question.

At @thomaso
 

On 6/6/2022 at 4:20 PM, thomaso said:

Do you literally need the white pole on a transparent background? And will the towers be white on all of your hundreds photos, with no white in the surrounding?

It is not about the color itself, I want to mask the background so my photogrammetry software will not use it for the calculations. Therefore, only the tower will be used. 
As you can see in the image, the tower is red and white with grey colour for the antennas. 


At @NotMyFault
 

On 6/6/2022 at 4:53 PM, NotMyFault said:

I could select o good portion by converting to HSL. unfortunately the colors in the tower match some of the colors in the background, no change to fully isolate them.

 Actually, what you showed in the image looks very promising. If most of the background is removed apart from the dark strip at the top of the picture, this may be enough to force the program to use only pixels from the tower. Therefore, my goal would be achived, even if the photo is not 100% masked.



 

On 6/6/2022 at 5:11 PM, NotMyFault said:

I use the PT filter to convert to hsl, rasterize the result to avoid spinning beachball (App hangs)

Then use flood select tool to try out if it is possible to get a clear selection.

unfortunately this failed in this case. The mask was created to show the interim (insufficient) result 

otherwise I would add another PT filter to encode the manual color selections.

Is the above the way you achieved the image you posted? I will do some resarch and I will try to recreate your process to see if I understand it well.

 

 

On 6/6/2022 at 5:25 PM, NotMyFault said:

AI based apps may succeed.

 

As for the AI, what you wrote is exactly what I was thinking myself. Unfortunately, without the knowledge of coding, it may be extremely difficult, so I would like to stick with regular programs and automatic/batch processes.

[Automatic masking by colour]

Hello,

I am a new user of Affinity Photo with small experience in Photoshop. What I would like to achive is quite simple (I hope so) but it needs to be done automatically. I have hundreds of photos of the cell tower. I want to mask everything except the tower itself. I have watched a couple of tutorials on Youtube but they focus on different aspects (mostly using one image to get the final result). I think that mask by colour would be the best (see attached image) but I don't know how to do it right. I would appriciate pointing me in the right direction (feature name, maybe some tutorial). If Affinity can't do this, I would be grateful for suggesting a software or some workaround.

 

Regards,