Sharpening on red channel luminosity layer

[Antonius]

Hi

I am trying to sharpen an image by using only the red channel as luminosity layer on top of the background layer. In PS its easy but with AP the image stays grey. Also in AP all the layers change to the red channel, while in PS the selected top luminosity layer is based only on the red channel and other layers keep their RGB colours.

Hope it makes sense.

Regards

Antonius

[Gabe]

Hi @Antonius,

Welcome to the forums. 

What is your workflow? Is it similar to this? 

Thanks,

Gabe. 

[Antonius]

Hi, thank you for replying. yes that is about what i do but instead of creating a grayscale layer, I use a duplicate red channel layer. I use it when i have a lot of skin in the image and do not want to sharpen it. In essence that is exactly what i do.

[Gabe]

Channels are natively grayscale.  They are just assigned a Colour overlay to create the image.

[Antonius]

So there is no way of having various layers each using a different channel. For instance the top layer only the red channel, and background layer all colours?

[Gabe]

No. The layers are applied globally over the channels and you cannot have certain layers only applying to certain channels, nor vice-versa. 

[Antonius]

Ok thanks. I understand. This would be a great feature for later. 

[lepr]

.

 

[Gabe]

28 minutes ago, >|< said:

 

You can clear the unwanted channels of an RGB Pixel object:

1. ensure the Pixel object is selected in Layers panel
2. in Channels panel, right-click the thumbnail of each unwanted channel of the Pixel object (not a Composite channel) and pick Clear.

 

 

This is a good workaround, but destructive. Once you cleared a channel, you cannot re-load it unless you saved it as a spare channel beforehand

[lepr]

.

[Antonius]

Yes I always keep the bottom duplicate in case I make a mistake. But clearing the unused layers seems like a very good workaround. Thanks for the advice.