Problem with selection

[Cueball]

I'm trying to blur the the with motion blur. It seems to be pulling pixels through my selection, which I do not want. I've tried various refine edge, but to no effect. Can someone with some experience, if possible, please help with a solution? 

I've attached two video screen shots for you to see what I mean.

Edited May 27, 2021 by Cueball

[DWright]

Hi @Cueball,

Welcome to the forum

This is caused as a result of the motion blur radius being very large, the way I get around this is to cut and paste the sky on a new layer blow the building and then on this new layer use the clone tool to add the sky to the cur out area and this will allow you to add the motion blur with high radius but remove the bleed through as shown in the attached screen shot.

[Cueball]

I'm not very knowledgeable, still learning. I managed to do this in Photoshop quite easily. Unsure why it seems a bit of a struggle in Affinity. I'll attach the image file for you, to give it a go. I really don't know where I'm going wrong here. The image looks really dark in Affinity for some reason, just bump up the exposure to bring it back, only if you decide to give it a go :-).

Thanks for your reply and support by the way.

 

Edited May 28, 2021 by Cueball

[carl123]

With the selection of the Sky active....

Layer > Duplicate Selection (CTRL+J)

This will give you a new layer which is just the sky

Does applying the motion blur to this new layer now give you your desired results?

[Cueball]

Still has the same problem. If you watch the other video, I have the sky cut out, and it still has the same issue. Looks like its still pulling through the selection. I tried it with the (CTRL+J), still with the same result.

I think I'll give up now. With something that should be so simple to do, it seems a lot of hassle in trying to make a simple blur effect work. It shouldn't pull through the selection. 

Thank you for trying to help though, very much appreciated. 🙂

[carl123]

Strange, I'm not seeing what you are seeing

Try it with Preserve Alpha ticked in the Motion Blur dialogue box

Also use the live motion blur filter and make sure it is a child of the Sky layer (as in my screenshot)

 

[Cueball]

I used the live motion blur filter, I didn't know that was there, or to use it. I was using the blur under filters. However, the live blur filter did work. Thank you for your help in resolving my problem. 

 

Thank you 🙂