Stamp alpha channel

[shushustorm]

Hello everyone!

Does anyone know if there is a way in Photo to stamp alpha values?

While RGB values will overwhrite A, A does not get picked up by the stamp or it will simply not overwrite RGB.

 

Here are two images to illustrate what I am talking about:

 

Image1, showing where I pick up colors:

 

Image2, showing where I want to stamp:

 

 

In Image2, parts of the green should be overwritten by alpha ("erased").

 

If this is currently not supported, could anybody move this to feature requests?

Thank you for any help!

 

Best wishes,

Shu

[Leigh]

You could use the Clone Tool to clone the Source to a new Layer and use this Layer to create a selection to delete the edge of the Green object or create a mask instead.

 

It would be easier to use the Channels Panel to select the Black object's Alpha channel and create a mask from that. Feel free to upload your file and we'll see what's possible :)

[shushustorm]

@Leigh

Thanks for your reply!

The screenshots were just from a test file to show the issue that I'm facing in a simple manner.

The files that I am actually working on are much more complex, but it comes all down to not being able to overwrite RGB with A using the Stamp Tool ("Clone Brush Tool").

 

If I understand your first suggestion correctly, I am not going to be able to get semi transparent areas though, right?

When creating a mask for the alpha, I am going to lose the RGB values that I want to stamp, won't I?

I actually need to read and write RGB and A at the same time.

I made another test file that is closer to what I am actually working on, so it may be easier to understand what I actually need.

 

Here is the file:

StampTest.afphoto

 

As you can see, there is a vertical line in the image that should be smoothed out. For doing things like that in RGB, I use the stamp. But when there is an alpha channel involved, it's rather difficult, because RGB overwrites A, but A won't overwrite RGB.

So basically, for example, after picking up color, if there has been alpha 100, it should erase at that point when stamping by 100/255.

 

EDIT:

Just for the record, the "Inpaint Brush Tool" does take alpha into account.

In some cases, I can solve problems like that with the said tool, but sometimes I'd just need the stamp to do that.

[Leigh]

Thanks for the sample image - It makes things clearer. After looking at your image I don't think what I suggested will help, sorry.

 

It doesn't seem possible to clone just the alpha values when using the clone tool. I can see why this would be useful, so i've moved this to the Feature Request section.