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I work with png files with transparency.  Currently, the only way I know to make an image with transparent edges is to select part of a non-transparent image, cut it out, and paste it in a new image.  But once it's there, I cannot make more parts of it transparent.

 

Is there a way to use normal drawing tools to edit the alpha channel of an image?  (This is not the same as drawing with transparency, as that only affects the SOURCE alpha, not the destination (background) alpha).  What I'd like to do is be able to directly change the background's alpha layer and paint "transparency" onto an image.  I've tried drawing with only the alpha channel visible, but it didn't work.

 

Any advice is appreciated.  

 

Great job on Affinity Photo - I love the updates.

- Jeff 

 

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Hi jdiamond,

 

You can apply transparency using different methods, ones I've used in the past are:

 

1, Using the Selection brush, selected your area, and hit delete, this will simply remove the selected area.

 

2, Again using the Selection Brush or Quick Mask option, create your area, then click Refine on the toolbar. Now you can refine the selection if required, Using the Selection menu you can choose to create a Mask or a new Mask Layer.

 

3, You can also simply use the Erase Brush Tool, changing the opacity, flow and hardness of the brush.

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  • 4 years later...

Thanks that is helpful -- the eraser is pretty useless being circular - perhaps the eraser should be allowed to have brush shapes ( or the  normal brush should pick up a colour of transparent )

Noted that this needs the shapes etc to be rasterised. (I'd dearly love a vector eraser in Designer - but that is another story)

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5 minutes ago, gw_westdale said:

Thanks that is helpful -- the eraser is pretty useless being circular - perhaps the eraser should be allowed to have brush shapes ( or the  normal brush should pick up a colour of transparent )

You can use other brush shapes. Click on the More button in the context menu, and in the dialog window that opens you can alter the shape, rotation, size, flow, spacing, ect.

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1 hour ago, gw_westdale said:

perhaps the eraser should be allowed to have brush shapes

If you look carefully at the tooltip text when you hover over the Eraser icon you should see that it says Eraser Brush Tool. It is a brush, and you can choose any of your brushes for it, using the Brushes panel.

-- Walt
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6 hours ago, walt.farrell said:

If you look carefully at the tooltip text when you hover over the Eraser icon you should see that it says Eraser Brush Tool.

Another clue that it is a brush based tool is among the options in the context toolbar there is a "More" button that if clicked opens the Brush - Selection window.  This allows you to change the brush's characteristics without changing any of the brush presets in the Brushes panel. You also get the symmetry options characteristic of brushes.

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